STM32MP157 Linux系统移植开发篇16：Linux内核音频驱动移植

STMCU小助手 · 2022-09-30T07:28:26+00:00

1.实验原理/ q4 o* G! @. w' @ FS-MP1A使用的是CS42L51音频芯片，SoC通过I2C和SAI与其进行数据交互，原理图如下：5 R2 ?" U, ~, L: S1 \ ! Y8 n6 c2 H, r ; T! o- s7 m* a8 R3 e 6 l) C! p4 F0 `6 d8 K3 |$ ~; o u SAI2管脚对应关系： / x& z- v* b- M7 ^. d5 v9 U& c+ y 1 W! d) D: w& _5 f# X 9 ]9 T& B: r. W0 [7 U$ I7 _9 b & u. g. ~/ N. F2 h + e" W( {2 @% o- h ' u4 j2 w: I" O' c3 B$ N B' x4 Q$ V/ d9 N0 ? ; B5 s8 @' a8 U4 U" ?: ?1 pI2C5管脚对应关系： 1 |2 i5 q5 z7 e1 q$ u4 S! O6 `) I! n. F' B8 i 6 p8 B& w3 ]% ]5 `+ g ; Y( c$ B2 T6 r8 Z" }) i 芯片复位管脚对应关系：' B( q8 S5 ^ w/ \" i0 D $ k- W ~- H8 ^ 6 C/ C r' l& \" E- F) c' q6 _ ' \3 p; [2 Y; y8 z$ d ) U: d- O& L/ b 1.SAI2设备树节点6 v W# j+ K9 i6 Q* ^0 y u8 b D' Y3 U . r. ^) h3 b" y& f$ p 内核中ST对STM32MP15x系列芯片的设备树资源了做了定义，可参见：( H9 x# |7 ?; f. |7 i5 x5 x7 t ! e3 J; V: f0 y7 q! Fsai2: sai@4400b000 {4 l" ~) E. T/ H1 p3 w; _, j# C9 x # M3 I8 w& m0 s9 E8 T+ g. Z3 F% P. wcompatible = "st,stm32h7-sai";* u" d" |$ g+ X! `: T % N; `+ P' @7 y6 r- U: [& C #address-cells = ; 9 E$ G8 J+ M6 {8 N" b : h- m0 _2 O* X; ~3 b$ S#size-cells = ;, v2 y/ \! I0 e/ h2 k1 \ 5 M% M' Y' e" H2 ]' k! C+ M1 w ranges = ;! W+ f; |! n! @; a( A, J 3 o" x& F, ~, {; l- l2 V# V reg = , ; 7 a8 a D. w% z1 v % Q+ L8 ` t5 C/ Winterrupts = ; 7 G3 ^8 h S5 V2 B# w " a; ]8 \# r7 E A; [- u' O( M. tresets = ;& V0 ]% i- J# u# x3 N4 A: @. {/ ^: Y$ M ) o# c' ? \8 o$ n+ Q: D# V# Y status = "disabled"; 8 }: V; C: r- |; n& K# P ' ], j3 q2 ]4 m: B8 J+ @+ Psai2a: audio-controller@4400b004 {. d: u$ `* \3 N; ~$ T; K' Y, `/ d4 Q R% |- r, r$ U+ b% [! ]. c+ P# L#sound-dai-cells = ; 8 I8 R- m, l% _& ~ L4 e8 v , l) u) ^7 }" Qcompatible = "st,stm32-sai-sub-a";7 m' ?3 l0 d6 I 5 ^# ?# T% L7 {9 w! S$ x3 a& kreg = ;/ R5 u w) q! i# v# @ # ?, t7 v, T K: `$ u5 R# vclocks = ;; X5 p, R6 y0 h( ~- t1 B $ v% z0 @8 ?9 T7 z) ?. | clock-names = "sai_ck"; 1 i6 b& _+ T& ~, }" ]( F# H: Q- b- m* X+ b dmas = ; - D* u/ E8 R& f. K% U. V& c9 v# R1 q: {( q6 N status = "disabled";, P6 z" [! S4 t% ~0 Q . f; N: k+ J2 h$ W' C5 j1 S% A };: A# |7 [% I. A( }4 ]3 S. u # A& |: @0 S; w' F8 Hsai2b: audio-controller@4400b024 {+ X, H) e+ t7 g( A% g , K/ g) V# _% o! |# u" @#sound-dai-cells = ;9 P" Y% _5 W/ t: w* U % s- X9 X+ v: L7 \4 R compatible = "st,stm32-sai-sub-b"; . A" ~3 d$ Q. k / Y# o9 g# E8 kreg = ;" ~. G1 T( [+ P; h2 } / Y: {* o) g& S8 l O! Q clocks = ; j) r$ K B0 |4 p, f ; J8 J A9 P% v) U$ G6 j! u: ^% F) S clock-names = "sai_ck"; . B! `# m9 k- O7 z( s- U! V% A2 n5 M8 U) s; H2 m0 u2 V' j dmas = ;' O$ b0 F. e, a9 V + c2 Y/ o4 o7 Z3 t% q e6 Z$ _; y3 Qstatus = "disabled"; 8 T$ ]2 {8 u9 N) @. E' y0 z 0 p1 P% J2 B) E7 I/ y0 z- N' q};1 @8 r. e7 {% v5 J* `. i; C & g I' O8 i: e }; . D5 o R/ J t$ q" x6 t; d( x; }1 |2 g Z O9 M 上述代码只对SAI2做了基本的初始化，并没有针对不同的硬件设计做适配，所以需结合硬件补全设备树节点信息。 O; s4 s$ d9 y. y* A! i% U 2 G# i- J' Q. e1 e% [: ] 参考stm32mp15xx-dkx.dtsi对于SAI2设备节点的描述，增加SAI2内容如下： 4 f) P# i& z; Q% T/ O - s# @" A" p' `- ^# q5 J* C- u2 B% \' f&sai2 { ) J. |! x7 z8 h+ Y* T& B ' z* ]' y8 x& T% `" Gclocks = , , ; % T; B, _# E) v9 T& {& H* K2 _" A: x# K. R0 A clock-names = "pclk", "x8k", "x11k"; : b. U! ?- E) G: c3 m7 D ! e: w+ t8 U! ypinctrl-names = "default", "sleep";1 d( _- [3 T/ R0 G - J, k" h$ p. n$ X8 B9 W& C' S+ s7 _- R5 d pinctrl-0 = , ;0 a. Y3 J. r) h+ T8 ] - l7 Z$ a) X6 w5 ~pinctrl-1 = , ;& L1 K3 a' `1 Q . Z4 e( Z, W0 q2 l$ Ustatus = "okay"; 9 {' d+ t. u$ f9 y: x% o( L3 M/ u3 S8 Y' B sai2a: audio-controller@4400b004 {9 }" s8 ]. e- ^ 6 a8 B3 P, W- p W |9 X#clock-cells = ; ' b# |" Z" k5 O0 G2 ?& {- `2 X( l7 B& Q$ @5 q& m. z dma-names = "tx"; 1 ~4 O6 Z8 m$ X% j8 n4 Z d8 y1 P / k9 d/ Y& P8 c6 t* `clocks = ; 8 `( w" {4 W2 Z6 N/ ~9 D$ q/ ?! C 8 I! l2 L2 ?9 r. u# W \+ K( ~clock-names = "sai_ck";2 h: s/ V$ H! p3 {# W% k C ) f ~& X& E" f& h status = "okay";4 N2 ?3 i6 }: F- T - |2 Z. T0 A" j/ F$ X9 ]sai2a_port: port {: W8 b2 D2 {8 O4 D+ P9 P8 y* o 9 B+ f: T5 @: D5 h$ R) t0 psai2a_endpoint: endpoint {6 a+ z, T5 H1 V( a 8 T/ _/ K! u. h remote-endpoint = ; : a$ g; z/ }% I6 r; B* U% W& y" z/ b8 ? format = "i2s"; , m' l& E n/ l# K# e7 [5 N* v, H3 ?0 W0 _" L2 N mclk-fs = ;& C' r5 [4 Z& M4 T3 r ; q% y' r& }! A# M; jdai-tdm-slot-num = ;* y" x. I+ `. B2 l. R 3 o4 W" j, f+ y! m& c7 s* sdai-tdm-slot-width = ; 3 }8 S0 ?5 M9 d _( Y) @/ b) M' r- G };$ l% U# }5 f3 e) V3 K. v3 c 5 Z8 k8 `9 b; A};) q* j" u/ U+ f$ h# w- M2 W 5 L. G3 K: y0 p1 \3 L1 H- n}; . P: D$ N" J8 \7 q+ E: f ( \& }8 v- m7 b1 gsai2b: audio-controller@4400b024 { ; X# b3 l( I" B! l/ U& t- o( W 1 P" g9 }/ q* D6 i( G0 s U4 mdma-names = "rx";: T' V: n: [( \' _4 r3 C 9 y1 F# f" s2 Z2 R; _ st,sync = ; 4 `6 A0 ~. V$ D! |5 S. W: t9 R 4 X% @) ~! E5 h6 iclocks = , ;% d. w }) S9 G X- O: y + m; D, {9 X5 J clock-names = "sai_ck", "MCLK";0 J& g% w: P: I* n) x n9 K( z/ m' \3 U9 Rstatus = "okay";; w) X7 ]9 }! w- r/ X ; L4 `8 i- n% c$ [1 q: J* ^sai2b_port: port { " l; d3 m+ f* A$ ?. G4 u5 T" Q/ ~8 o& S2 X$ L sai2b_endpoint: endpoint {! k+ [$ E3 T0 w 9 R; p. j$ M/ }4 A. A) r8 wremote-endpoint = ; # t; A3 m$ d) q, F7 l; U8 l6 m% i' a format = "i2s";! \. d, L& v% f ) l4 D$ G2 O0 F. ^& c: Z3 amclk-fs = ; & `# P1 \0 K- G$ t; b & |& D3 ]) Q/ w% e% S7 V7 I- ?dai-tdm-slot-num = ; * @( e! j5 @, L7 h9 D/ q- v4 Y3 ~# y, c8 P* z4 y- | dai-tdm-slot-width = ;: ]. l# `$ ^" j* Z9 Q5 d z$ a3 x$ x2 z# M };) h& Y7 T e* a% `9 x & B' l* z5 ~$ j' i/ B5 X}; 7 \ d" J9 V" Z, V m x6 }( p9 I! i* r) _+ | };# Y @: r! H& A; k3 {5 ?) v 2 |( n% V# a& _, G };& [# p/ K6 j% h% s. Q. F M* x) b . h# h" _/ ?& X* l, ]- C8 c" [由于stm32mp15-pinctrl.dtsi中对于SAI2管脚的定义与FS-MP1A实际使用管脚一致，所以无需修改。 : n& r) {8 ~* U- S& Z# T" X + l( M, Q: K, M& a& N2.CS42L51设备树节点7 J- M/ F1 J4 T- l& |% Z, p0 l 由于前文中已经增加过I2C5的节点信息，本节就不再重复，在原有I2C5节点添加CS42L51内容即可。 * G. L% k# M; a! R" Y! e7 f5 i$ r" a' n; e + }" Y7 L! C7 a9 T9 @+ y参考stm32mp15xx-dkx.dtsi对于codec芯片设备节点的描述，增加内容如下：' @1 x1 k. d- ~9 n3 l ! j) X, T) x2 A0 k4 n cs42l51: cs42l51@4a { 3 v1 @, _/ n: [+ }. t, V& o) K, ^4 }2 C0 ~7 Q# c" ^ compatible = "cirrus,cs42l51";8 e3 {7 x$ O+ j- I+ ~( M 7 K5 L, @! ?+ A8 p7 [* b reg = ; / r7 K- g- C+ }% X2 a' ?2 ^( \ $ ^9 k6 F: Q, P6 t9 i: }; S#sound-dai-cells = ; W" f5 e) G, ?/ S% K D2 \4 {7 M9 o VL-supply = ; + X* ]( j9 n! q% ^: n( X ; R! E( Z+ j6 Z; S5 x) \4 JVD-supply = ;. D/ u9 U0 [/ u + p u3 M; p& Y6 E# I/ j. q VA-supply = ;- P4 X; _" ]6 ` $ A7 A6 A6 g4 k' N9 m1 g9 N1 NVAHP-supply = ; * A+ O2 r& Z! v z . m- T7 r0 t x9 h# ?( Freset-gpios = ;5 _6 `2 P2 {+ M, C 9 W" i3 t* \+ f tclocks = ; 4 }1 ^; m9 h9 x2 | 9 I( e7 E, V$ ]7 a, ^clock-names = "MCLK";. r! F7 R' w( A- y$ v % l; P6 s. Y0 y3 @, ^ status = "okay";' Z) p$ X* ], o9 L- f' I0 c ) P5 q) T% K- {+ Y0 ]cs42l51_port: port { " L% _' e( }9 ]$ z/ K. v/ S: o9 ^+ H8 _( [8 b #address-cells = ; ( T9 w; \ r- X) n/ B + |. `4 {; D& j% W5 ~- Z) M3 @#size-cells = ;8 R4 Q1 d! ^ h6 Q# Z" g4 X ) _7 B1 [/ T/ I* m% ?9 C$ f cs42l51_tx_endpoint: endpoint@0 {6 L" \- B) L: r! F2 _/ R/ {- N! y 3 X8 P) P7 k I$ h8 mreg = ; ) z6 A+ i4 W4 J$ W0 z( T1 J 3 O/ {. L9 J0 c) Y1 e. ^remote-endpoint = ; 4 I& T& J" I; g+ q7 p% f" W* h, e2 J d9 `3 g( c/ s4 A frame-master;$ r8 c0 e# c$ T4 ~9 X 8 Z3 L3 S: f% B9 G9 v% ]1 Ubitclock-master;; k2 W8 n2 \ ^, H0 P) l 6 F4 k) E) B: j8 O7 |5 C. s };' [3 T) k5 R; b) p' v: {7 V& n 4 l) ]0 ^/ {3 _* F+ O. _ cs42l51_rx_endpoint: endpoint@1 {' `# {9 w/ G# W7 h1 ]1 p % l$ v8 D8 z0 h reg = ;' x3 @% p8 ^! p! Z ) E* H# W9 {+ l6 q" t+ R remote-endpoint = ;) d9 p7 t$ J& p5 T& `) n1 ~ 6 C! q1 A, H J! m+ { frame-master;/ C1 o8 q% }7 Q* {5 @% j+ d0 U( P 8 b" z$ {1 V! Qbitclock-master; 9 o3 H. x2 `" w g + F. X* G+ X. L5 R' u& d};0 a) Q+ {5 W# e F/ n( M1 e4 Y, B 7 T8 Q& w+ J8 S7 k3 N}; ' G0 S$ m9 ]2 _6 }3 V# N: B2 d- f0 c6 ~/ |5 M- ]- V+ r) J };) ~2 y9 R7 r+ `6 p: ?0 t9 x" d, K & z6 Z# l' j( ^ 3.1.8V电源设备节点 6 t# }! H* H- w# q B前文已经说过如何添加电源节点，本节不再重复，在根节点添加&v1v8_audio节点，内容如下：4 w l) o9 L7 K G 6 R' [# a+ c. P& s, g1 n v1v8_audio: regulator-v1v8_audio { 2 V# Q. F0 @9 M0 X! {& ]- @! h' p+ C3 C0 r3 c5 E( n& e u compatible = "regulator-fixed";7 n1 r$ w- u. A ( Z* z: `& K1 A) s/ t: ]0 ] regulator-name = "v1v8_audio"; ) k. ~! f, ?4 P9 p6 `( J/ `! P+ O0 G5 w" t' l& _7 I; H regulator-min-microvolt = ; 0 v8 O& |5 N8 J! x4 j # G7 B e4 X4 P( mregulator-max-microvolt = ; x7 p' A: V6 k) W1 F& G5 Q p- g( ]6 r# N( |4 K regulator-always-on; 1 _2 r+ r0 D) A C+ \/ b8 p - J1 C4 H" x, c) E* F4 |6 A6 n+ Bregulator-boot-on; ) _; F% }: v) ?: u0 g Q" x1 `5 A# G" z( F }; ' r& S5 w4 W- Q 5 g, ~9 v4 ~$ O0 d5 m1 z& K' L' c4.SOC声卡驱动节点" G j& X2 O7 B" Z" e 内核中包含audio-graph-card驱动，驱动将声卡各个部分关联起来，驱动正常工作需添加对应设备树节点。 ) o% G7 w4 Q9 L) @/ A: h5 i& P 5 w+ i% Z, a8 ?: w在根节点写下添加sound节点： + ^& s* A$ U$ u q; l( v( g+ n6 H3 D j3 u sound { 0 n$ ^8 p7 R ` v2 w- z' j) W a9 Q compatible = "audio-graph-card";' D& Z3 W7 N9 v# `( c' g , h( Z* I6 F3 d L label = "STM32MP1-FSMP1A"; 8 Y9 d1 H" i! p) R9 h+ I% L) K; x, B$ s2 x$ G0 X routing =0 u3 n$ J) P) t " V" n5 V8 y" I &quotlayback" , "MCLK",* f# g# R) \6 H ! b; x. P* U8 n* M4 v "Capture" , "MCLK", - M7 v$ M( Y8 @$ i. O, M; V/ r . d/ E. R) m: n% _+ J$ U9 q"MICL" , "Mic Bias";. `9 W8 e$ |# b6 i; h , U" Q; g; O- [, |% ?! _5 ~ dais = ;$ E4 h. e9 ^/ B4 W8 K: `4 P 3 ?) G+ b( l7 q. V+ O# X, I1 _ status = "okay";+ c0 p/ p! X$ L& q 4 t; B; S) Z) w5 s) r% N }; ) [5 V, m2 \7 Y! \ 5 _: k5 Q8 o9 O6 @! T- C9 Y( J1 y2.实验平台- ~" l% v" p9 F2 E) m C6 O8 n) M 华清远见开发环境，FS-MP1A平台；% u* @, s1 P( ^ - E& @- ]$ z1 q1 s3.实验目的 5 ^$ w/ @6 h) u2 b! I' n! d熟悉基于Linux操作系统下的音频设备驱动移植配置过程。 3 p x5 s7 \& b! ?7 d) A5 Y+ W; e& i* B3 Q" s! Y' g0 M* _ 4.实验步骤" K/ i! F/ M2 [ l' U; N 1.导入交叉编译工具链4 n4 C) Q3 v7 ] ] linux@ubuntu source /opt/st/stm32mp1/3.1-openstlinux-5.4-dunfell-mp1-20-06-24/environment-setup-cortexa7t2hf-neon-vfpv4-ostl-linux-gnueabi # F l& M, V/ d0 s4 t3 ` s. w4 `2 B 2.添加SAI2节点 ! c+ F3 L- y% L) F) A$ o; v/ g% }修改arch/arm/boot/dts/stm32mp15xx-fsmp1x.dtsi文件，在文件末尾添加如下内容：4 F/ k& v: E% O2 e0 E ! y9 U/ a2 W/ t0 r5 f0 r&sai2 { 5 u- _2 d9 w9 [+ Y- c3 R: @; W$ e! S5 U: @! X3 @' N clocks = , , ;% x4 m D9 S# p; B % F) ^$ {/ E' _; rclock-names = "pclk", "x8k", "x11k"; % R; }2 P8 u' ]. J; h; r* \ 9 U# Z1 g, C. r& [- u6 H, j$ [pinctrl-names = "default", "sleep"; # Y+ J5 z1 j: i) t* I2 @7 Q+ q / F6 ^$ M0 T( \$ Y8 Bpinctrl-0 = , ;" G+ S0 e8 j1 w2 {' D 3 l' t( E2 L* j7 c3 L/ T( J% W+ b pinctrl-1 = , ; 9 d& \2 h. }; \2 w) t3 `6 f9 B . T! a: c0 @5 Hstatus = "okay"; / A0 O A3 h7 w8 o + R+ H7 A1 P- D& o, j# X7 Bsai2a: audio-controller@4400b004 { ( t+ v" ]* a/ [# r% \3 C: o8 _4 m w/ W( f# |- l$ b, k- T #clock-cells = ;$ b; r; {$ L; l7 W& I9 g % m; ~* R+ ?2 }/ H6 u3 A dma-names = "tx"; * n2 t& j* a- h& M" _1 N / I9 }. ~' S8 bclocks = ;4 `' E( H+ J2 H g6 j. Z0 \9 L. ~ + a. l, i6 m# C* A/ g clock-names = "sai_ck";; Z" O! f5 `! \9 e) j( K. c * f2 T, ]7 N( A1 `0 v- _5 Wstatus = "okay"; 6 |$ c5 F, q1 N c% x5 K6 M, f6 m2 ~' I2 W$ h8 l* j$ q9 Q sai2a_port: port {5 l( D+ Y, t% U6 f/ i ! L' c: Z& X; t' W0 ssai2a_endpoint: endpoint {) u D% M7 a' m: V8 V" h! Q# I 6 R" q/ E8 \: e' iremote-endpoint = ; , H3 o$ l6 L4 H( q7 V' T ; V& d) I' @( i# ~1 _format = "i2s"; 6 q, S0 I* J; O / j+ R% a6 q& O; Q! H" u; N/ Ymclk-fs = ; " o! F+ t2 E* C$ j 5 H1 Q3 q5 \! _9 B0 c2 g V3 A6 Pdai-tdm-slot-num = ;2 V) X Y: {- A3 I; W5 Z " x) t/ I# N- V5 N0 w7 P# j. H dai-tdm-slot-width = ;7 s* p( _; s# x% h- c2 r1 B / s: g8 F1 A }9 C};: g1 C m: W$ n+ N ' K5 t6 `9 n: e' f) Y8 O}; 7 j3 l9 c' U$ Q6 Z6 L% V1 l- w2 _( B& ~* n ~1 X }; & `, v# A/ X! A3 S# N1 e8 U/ x# x6 S, r& p0 C$ U sai2b: audio-controller@4400b024 { * \5 H5 c8 x+ V5 Z8 V3 H& P" @/ w V! V : q# ?* U2 n0 G% k9 H/ M; A- { y. G4 Kdma-names = "rx"; / p. _& a* o/ q: e( T5 p 2 D' D$ _0 K% ^( L+ est,sync = ; B2 Q8 F- e6 D& m) t: n 8 J& {# d! N7 Y0 Q2 rclocks = , ; ' |$ f- q) Z" D M6 n' U, _/ {* s( g2 X( z clock-names = "sai_ck", "MCLK";* ]+ J. @/ }1 L0 O5 B 1 n [' d, a7 u( R- ]status = "okay";1 @5 E0 F; p) s1 n2 f1 m, A 0 r; F4 x5 h( V8 O5 E5 |+ Q sai2b_port: port { 2 l+ {2 W/ I# D Y1 i7 O+ k; ` 0 O0 h' k9 T, Lsai2b_endpoint: endpoint {; L D, d6 M$ N; `( H7 m* E, U d 2 @ u+ B" m7 } remote-endpoint = ;/ r9 q" x1 w% \$ U7 W9 _! i2 \ $ q0 C, c% U8 c format = "i2s"; ' z3 S' B! T0 y* ?8 h8 W9 L j/ b* F) N( {! U mclk-fs = ; + Q t$ L h( @1 L" P6 F5 R$ s. |3 U1 H$ U; ~. V/ [ dai-tdm-slot-num = ; / l: u9 u7 s W! I0 V* d" H: k: T. a' ]3 U7 F8 C3 F, C dai-tdm-slot-width = ; 9 C- t* W$ D* y5 u8 Y4 ] ; W3 \; X/ B4 l}; P: @) g7 I" f4 O' Q( I$ D C1 x$ C( ] }; 9 U* ^' W. F6 R* C) F. c+ V1 T V: l4 M" m4 z" @; ]1 f. `2 X}; . B) k& o& `+ I, l z, O9 N8 `7 R, m: A$ P; o }; 5 B# X4 V Q* k" y2 { : H3 {9 v/ x2 p/ F0 U, B3.添加CS42L51节点 % R" [9 n0 F& t修改arch/arm/boot/dts/stm32mp15xx-fsmp1x.dtsi文件，在I2C5节点中添加如下内容： ) {$ x6 D1 K' Y# T4 ?# R2 J7 V W# ?, W# i: Y cs42l51: cs42l51@4a {! j9 P0 w$ M! ?" a7 P" ] . B0 e& Q- P6 Ucompatible = "cirrus,cs42l51";$ h7 M* |3 E% f4 P/ w9 y9 Y " o+ \7 [9 X0 n0 @" Qreg = ; ! v& A( E: W& S, j; Y. M/ K. X " @# _3 I L, P; y/ T7 Z#sound-dai-cells = ; 2 K7 k0 v- C( v( A9 E# ~ ! N- Z& Q% P7 OVL-supply = ;( ?3 }, l4 u/ D7 {6 v) e" | & ^4 D9 X! P! Z: X VD-supply = ;$ W l" X2 k3 c8 o/ u1 r* Q # ]- T( y% V/ X, Y1 j3 _1 \$ nVA-supply = ; ) Q4 b! o+ Y- ?4 L' y! H1 S5 x 4 G3 E: d7 D1 d) U/ |VAHP-supply = ;0 A% c& J$ ]% I& W+ r: M# k 9 n+ u* i! ?1 A9 c2 F/ p reset-gpios = ;9 N' C" G! `9 s6 I2 r$ g ' h. w5 ~% P- Y! Z$ T clocks = ;/ @4 j3 p& U$ P$ n5 _4 O + N: S8 v6 s/ |7 O4 k: Z( hclock-names = "MCLK"; ; k* c8 \' P" [% ~3 w! x/ }& v) ` M" N1 h; h! o/ J' A4 ~ status = "okay"; % b6 K6 Y& I# b- T0 _* U& u) M9 B; N" m% z# R9 w cs42l51_port: port { v) V' i, {% F, p5 ?5 ]+ D# s% Q- U: Z, Y D' \1 J* y+ W$ K #address-cells = ; , ^5 D7 G; h0 u" u& [$ ^ 5 | x K* |, }1 C5 d* Z6 b5 D# B! M#size-cells = ; % \0 e! I+ g) S- Q * d- X4 W6 X/ M3 Q/ g$ I( |( l! _cs42l51_tx_endpoint: endpoint@0 { 7 p+ j! a& H6 j( V7 C% A K7 d5 K$ @. \ reg = ;5 s/ m1 M- R+ B; r7 q& h 8 U8 {+ i; `6 J0 { remote-endpoint = ;( g% [% S# ?2 y, c 6 U! l/ y3 P6 h( t' cframe-master;9 J& [' a& l0 c; h) y2 g( k $ m/ _% E! P$ q" C1 H I6 }bitclock-master;/ s$ b& ^4 U' \' j- o 2 I& s& w+ ~- U }; 8 p" ~/ H. O( F* H& U6 Y+ ]& H r; g cs42l51_rx_endpoint: endpoint@1 {% g- j, u8 Z+ y* Q 4 z" b! v4 \& B' l: C5 ]1 z! l reg = ;8 A) a/ K7 p0 h: y- Z * l0 H0 ?) H# u9 K0 M$ bremote-endpoint = ; 3 X3 V7 m: c" A. i% }+ J% p3 G9 T: J) i! P( L8 d, ` frame-master;4 l7 D/ _0 }# u+ x + g) w) L- @5 k# i7 v& ubitclock-master; . \9 w9 R' z" H7 ]3 G f# s- ]3 Z; Z% G. I }; . M5 Q( B/ J2 R# q. F6 G% D / A6 C) S" M4 G! a1 \( k}; 4 ?; R7 G+ O. }9 r" n Q+ c ( J+ B' ?+ I/ s, D6 T! o3 x}; 5 v- V) m+ f3 D$ j 3 U: w) ?2 n+ Z m& W4.添加v1v8_audio电源节点 8 Q2 j- S$ i7 q& z% o修改arch/arm/boot/dts/stm32mp15xx-fsmp1x.dtsi文件，在根节点中添加如下内容：$ D, J9 Z9 K. X, t9 _ ~$ ]) ~7 o* { % u8 i; C+ i* k, z* {+ `& F: t3 Yv1v8_audio: regulator-v1v8_audio { 3 A$ W- y& B. t* ?- c z! [1 M1 {+ v) m& dcompatible = "regulator-fixed";1 D p( \$ I( k% V% s+ z + z( i* ~/ F( a6 V regulator-name = "v1v8_audio";1 ~" R l. M2 M! j , N6 Q8 l" l" O* [# {: xregulator-min-microvolt = ; ) T( R& }9 s- t1 ~+ a; f. m' Y* n: Z/ Q+ |/ p6 G regulator-max-microvolt = ; 3 p& w1 }6 _- b1 q& z7 M' s j1 s. O2 s) V+ { regulator-always-on;, a: F: R4 Z- S3 p- _ 7 b0 j3 v$ o# S3 h regulator-boot-on; 3 O: |! R1 l5 h& O 5 ^0 A8 i8 g: P' T% d1 x# }7 ^}; 2 _& X6 T: D( e' g/ v' W# M - R+ _6 T- M& w1 s2 N2 Q3 f5.添加Sound节点0 P: ]. S/ J! O 修改arch/arm/boot/dts/stm32mp15xx-fsmp1x.dtsi文件，在根节点中添加如下内容：8 |' O# e6 }2 |, n( Y) \ : ]; i9 {2 d2 {5 j6 ^* N; D, U7 T sound {6 I1 j- X; |3 P8 v- }6 r* U5 m0 N ( I8 I" C% L$ B8 A9 l7 ^* e compatible = "audio-graph-card";# v( G& U: t- L% S ( P* \) W2 { t' }label = "STM32MP1-FSMP1A"; - W0 C! ^* U# C+ K8 Z9 a 5 Y6 g* k& p" U/ Prouting =- G, n L$ ~% O) U * @! C- B8 w1 b; k9 T8 a&quotlayback" , "MCLK", ( e+ G u" }, \3 c( t! a6 P2 J$ C! f0 |7 l8 v) X "Capture" , "MCLK", 2 V9 Z' Q6 q2 q$ w2 Z/ H( J3 C " G9 O" O2 d4 c"MICL" , "Mic Bias"; ) R& D9 ^' ^3 T: B4 c/ B : b6 p# i5 u( u$ |1 J4 y- A4 Udais = ;7 }, t7 z% L7 r3 q! V1 U/ c + s" }7 S1 s4 A% Istatus = "okay"; 5 K& k* x- ^3 T0 R! [' {- w6 S( n: F! T0 G- V- ^* Z7 h0 b3 r };0 |: V& o( a. W+ V: q g $ K/ o8 ?/ H! l5 G 6.配置内核9 j a7 z7 g. r 由于内核源码默认配置以及支持CS42L51，本节列出主要选项，如下：: [5 _3 K3 f. d) f* I5 {6 K ' a5 M0 _1 n# y6 u linux@ubuntu make menuconfig+ S1 P# m2 a% ^% V/ m ; W8 w5 S& H: _- z2 `0 e$ [ Device Drivers ---># W9 d1 M/ s# d# Z8 M7 p4 u' c+ b ! O) i( X, v; E. L$ a, J. X Sound card support --->3 t1 X* `8 z/ X# F/ D" A/ E $ Y8 N/ d2 y: V! E. ?; [3 j1 `; X; n Advanced Linux Sound Architecture --->" b' e! i- t5 G4 Z + ?8 o' a; c* @3 q# |3 m+ W( j ALSA for SoC audio support --->$ l6 n, [7 N3 D. n6 i* k 1 W9 S9 n3 K. Y' U STMicroelectronics STM32 SOC audio support ---> # T j$ T* R) f, ~! l3 G8 {& }5 ^$ E5 `& E3 | STM32 SAI interface (Serial Audio Interface) support; z! n+ U. \. _3 X 0 b! f1 M1 D* l; b: C# b8 ~, ECODEC drivers --->; `6 R5 l: i3 s+ R" h0 j6 a5 y % H2 b. f e1 U3 M3 x Cirrus Logic CS42L51 CODEC (I2C) : s9 F1 v% I1 ]/ J# H* n& d& Z i9 q$ P ASoC Audio Graph sound card support , z9 g/ I* `2 n j0 J5 K # K% I" r0 A. K' q: n7 q% i- ]7.编译内核及设备树 ) t: S7 N' Z4 `# N0 d' B+ vlinux@ubuntu make -j4 uImage dtbs LOADADDR=0xC2000040 7 v! ]1 h9 b! E4 j/ T$ [* V5 r) |6 E3 k1 o 8.重启测试 1 k" I, u; I F将编译好的设备树和内核镜像拷贝到/tftpboot目录下，通过tftp引导内核，启动后启动信息中出现如下内容： ! R ~% i8 e! L. n8 K# O0 v' d$ V 1 Y2 z+ }* s, d( ^! ? 6 H! b! h( L8 ^) S) a! t" _插上耳机，终端输入录音命令：8 E# Q8 o6 j* y0 p% b/ Z 3 _5 |2 R) [6 d! K1 M6 V root@fsmp1a:# arecord -D record_codec -f S16_LE -d 10 test.wav0 I: D h/ x* ^0 j( f. H 8 N& t! c5 I& Y) w) |3 L; W& E! f% L终端输入播放命令：9 p l8 s, I2 ?; B% h * I) [' a+ K# Kroot@fsmp1a:# aplay test.wav 0 ^9 V Q0 {4 m! ]3 H/ r: E& o6 C. s ————————————————& Y+ p. ?( G, u' o 版权声明：华清远见IT开放实验室 }% J, F, ~( @4 {2 m# |; a . s- y" ~6 G3 \; | 5 y& T: u) H1 J4 [8 Y

STM32MP157 Linux系统移植开发篇16：Linux内核音频驱动移植

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STMCU小助手发布时间：2022-9-30 15:28

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文章封面:
文章简介:	STM32MP157 Linux系统移植开发篇16：Linux内核音频驱动移植

1.实验原理
FS-MP1A使用的是CS42L51音频芯片，SoC通过I2C和SAI与其进行数据交互，原理图如下：

SAI2管脚对应关系：

I2C5管脚对应关系：

芯片复位管脚对应关系：

1.SAI2设备树节点

内核中ST对STM32MP15x系列芯片的设备树资源了做了定义，可参见：

sai2: sai@4400b000 {

compatible = "st,stm32h7-sai";

#address-cells = <1>;

#size-cells = <1>;

ranges = <0 0x4400b000 0x400>;

reg = <0x4400b000 0x4>, <0x4400b3f0 0x10>;

interrupts = <GIC_SPI 91 IRQ_TYPE_LEVEL_HIGH>;

resets = <&rcc SAI2_R>;

status = "disabled";

sai2a: audio-controller@4400b004 {

#sound-dai-cells = <0>;

compatible = "st,stm32-sai-sub-a";

reg = <0x4 0x1c>;

clocks = <&rcc SAI2_K>;

clock-names = "sai_ck";

dmas = <&dmamux1 89 0x400 0x01>;

status = "disabled";

};

sai2b: audio-controller@4400b024 {

#sound-dai-cells = <0>;

compatible = "st,stm32-sai-sub-b";

reg = <0x24 0x1c>;

clocks = <&rcc SAI2_K>;

clock-names = "sai_ck";

dmas = <&dmamux1 90 0x400 0x01>;

status = "disabled";

};

};

上述代码只对SAI2做了基本的初始化，并没有针对不同的硬件设计做适配，所以需结合硬件补全设备树节点信息。

参考stm32mp15xx-dkx.dtsi对于SAI2设备节点的描述，增加SAI2内容如下：

&sai2 {

clocks = <&rcc SAI2>, <&rcc PLL3_Q>, <&rcc PLL3_R>;

clock-names = "pclk", "x8k", "x11k";

pinctrl-names = "default", "sleep";

pinctrl-0 = <&sai2a_pins_a>, <&sai2b_pins_b>;

pinctrl-1 = <&sai2a_sleep_pins_a>, <&sai2b_sleep_pins_b>;

status = "okay";

sai2a: audio-controller@4400b004 {

#clock-cells = <0>;

dma-names = "tx";

clocks = <&rcc SAI2_K>;

clock-names = "sai_ck";

status = "okay";

sai2a_port: port {

sai2a_endpoint: endpoint {

remote-endpoint = <&cs42l51_tx_endpoint>;

format = "i2s";

mclk-fs = <256>;

dai-tdm-slot-num = <2>;

dai-tdm-slot-width = <32>;

};

};

};

sai2b: audio-controller@4400b024 {

dma-names = "rx";

st,sync = <&sai2a 2>;

clocks = <&rcc SAI2_K>, <&sai2a>;

clock-names = "sai_ck", "MCLK";

status = "okay";

sai2b_port: port {

sai2b_endpoint: endpoint {

remote-endpoint = <&cs42l51_rx_endpoint>;

format = "i2s";

mclk-fs = <256>;

dai-tdm-slot-num = <2>;

dai-tdm-slot-width = <32>;

};

};

};

};

由于stm32mp15-pinctrl.dtsi中对于SAI2管脚的定义与FS-MP1A实际使用管脚一致，所以无需修改。

2.CS42L51设备树节点
由于前文中已经增加过I2C5的节点信息，本节就不再重复，在原有I2C5节点添加CS42L51内容即可。

参考stm32mp15xx-dkx.dtsi对于codec芯片设备节点的描述，增加内容如下：

cs42l51: cs42l51@4a {

compatible = "cirrus,cs42l51";

reg = <0x4a>;

#sound-dai-cells = <0>;

VL-supply = <&v3v3>;

VD-supply = <&v1v8_audio>;

VA-supply = <&v1v8_audio>;

VAHP-supply = <&v1v8_audio>;

reset-gpios = <&gpioc 0 GPIO_ACTIVE_LOW>;

clocks = <&sai2a>;

clock-names = "MCLK";

status = "okay";

cs42l51_port: port {

#address-cells = <1>;

#size-cells = <0>;

cs42l51_tx_endpoint: endpoint@0 {

reg = <0>;

remote-endpoint = <&sai2a_endpoint>;

frame-master;

bitclock-master;

};

cs42l51_rx_endpoint: endpoint@1 {

reg = <1>;

remote-endpoint = <&sai2b_endpoint>;

frame-master;

bitclock-master;

};

};

};

3.1.8V电源设备节点
前文已经说过如何添加电源节点，本节不再重复，在根节点添加&v1v8_audio节点，内容如下：

v1v8_audio: regulator-v1v8_audio {

compatible = "regulator-fixed";

regulator-name = "v1v8_audio";

regulator-min-microvolt = <1800000>;

regulator-max-microvolt = <1800000>;

regulator-always-on;

regulator-boot-on;

};

4.SOC声卡驱动节点
内核中包含audio-graph-card驱动，驱动将声卡各个部分关联起来，驱动正常工作需添加对应设备树节点。

在根节点写下添加sound节点：

sound {

compatible = "audio-graph-card";

label = "STM32MP1-FSMP1A";

routing =

"

layback" , "MCLK",

"Capture" , "MCLK",

"MICL" , "Mic Bias";

dais = <&sai2a_port &sai2b_port>;

status = "okay";

};

2.实验平台
华清远见开发环境，FS-MP1A平台；

3.实验目的
熟悉基于Linux操作系统下的音频设备驱动移植配置过程。
5 Y+ W; e& i* B3 Q" s! Y' g0 M* _
4.实验步骤
1.导入交叉编译工具链
linux@ubuntu

source /opt/st/stm32mp1/3.1-openstlinux-5.4-dunfell-mp1-20-06-24/environment-setup-cortexa7t2hf-neon-vfpv4-ostl-linux-gnueabi

2.添加SAI2节点
修改arch/arm/boot/dts/stm32mp15xx-fsmp1x.dtsi文件，在文件末尾添加如下内容：

&sai2 {

clocks = <&rcc SAI2>, <&rcc PLL3_Q>, <&rcc PLL3_R>;

clock-names = "pclk", "x8k", "x11k";

pinctrl-names = "default", "sleep";

pinctrl-0 = <&sai2a_pins_a>, <&sai2b_pins_b>;

pinctrl-1 = <&sai2a_sleep_pins_a>, <&sai2b_sleep_pins_b>;

status = "okay";

sai2a: audio-controller@4400b004 {

#clock-cells = <0>;

dma-names = "tx";

clocks = <&rcc SAI2_K>;

clock-names = "sai_ck";

status = "okay";

sai2a_port: port {

sai2a_endpoint: endpoint {

remote-endpoint = <&cs42l51_tx_endpoint>;

format = "i2s";

mclk-fs = <256>;

dai-tdm-slot-num = <2>;

dai-tdm-slot-width = <32>;

};

};

};

sai2b: audio-controller@4400b024 {

dma-names = "rx";

st,sync = <&sai2a 2>;

clocks = <&rcc SAI2_K>, <&sai2a>;

clock-names = "sai_ck", "MCLK";

status = "okay";

sai2b_port: port {

sai2b_endpoint: endpoint {

remote-endpoint = <&cs42l51_rx_endpoint>;

format = "i2s";

mclk-fs = <256>;

dai-tdm-slot-num = <2>;

dai-tdm-slot-width = <32>;

};

};

};

};

3.添加CS42L51节点
修改arch/arm/boot/dts/stm32mp15xx-fsmp1x.dtsi文件，在I2C5节点中添加如下内容：

cs42l51: cs42l51@4a {

compatible = "cirrus,cs42l51";

reg = <0x4a>;

#sound-dai-cells = <0>;

VL-supply = <&v3v3>;

VD-supply = <&v1v8_audio>;

VA-supply = <&v1v8_audio>;

VAHP-supply = <&v1v8_audio>;

reset-gpios = <&gpioc 0 GPIO_ACTIVE_LOW>;

clocks = <&sai2a>;

clock-names = "MCLK";

status = "okay";

cs42l51_port: port {

#address-cells = <1>;

#size-cells = <0>;

cs42l51_tx_endpoint: endpoint@0 {

reg = <0>;

remote-endpoint = <&sai2a_endpoint>;

frame-master;

bitclock-master;

};

cs42l51_rx_endpoint: endpoint@1 {

reg = <1>;

remote-endpoint = <&sai2b_endpoint>;

frame-master;

bitclock-master;

};

};

};

4.添加v1v8_audio电源节点
修改arch/arm/boot/dts/stm32mp15xx-fsmp1x.dtsi文件，在根节点中添加如下内容：

v1v8_audio: regulator-v1v8_audio {

compatible = "regulator-fixed";

regulator-name = "v1v8_audio";

regulator-min-microvolt = <1800000>;

regulator-max-microvolt = <1800000>;

regulator-always-on;

regulator-boot-on;

};

5.添加Sound节点
修改arch/arm/boot/dts/stm32mp15xx-fsmp1x.dtsi文件，在根节点中添加如下内容：

sound {

compatible = "audio-graph-card";

label = "STM32MP1-FSMP1A";

routing =

"

layback" , "MCLK",

"Capture" , "MCLK",

"MICL" , "Mic Bias";

dais = <&sai2a_port &sai2b_port>;

status = "okay";

};

6.配置内核
由于内核源码默认配置以及支持CS42L51，本节列出主要选项，如下：

linux@ubuntu

make menuconfig

Device Drivers --->

<*> Sound card support --->

<*> Advanced Linux Sound Architecture --->

<*> ALSA for SoC audio support --->

STMicroelectronics STM32 SOC audio support --->

<*> STM32 SAI interface (Serial Audio Interface) support

CODEC drivers --->

<*> Cirrus Logic CS42L51 CODEC (I2C)

<*> ASoC Audio Graph sound card support

7.编译内核及设备树
linux@ubuntu

make -j4 uImage dtbs LOADADDR=0xC2000040

8.重启测试
将编译好的设备树和内核镜像拷贝到/tftpboot目录下，通过tftp引导内核，启动后启动信息中出现如下内容：

插上耳机，终端输入录音命令：

root@fsmp1a:# arecord -D record_codec -f S16_LE -d 10 test.wav

终端输入播放命令：

root@fsmp1a:# aplay test.wav

————————————————
版权声明：华清远见IT开放实验室