ARM: dts: stm32: add audio codec support on stm32mp157a-dk1 board

Add support of Cirrus cs42l51 audio codec on stm32mp157a-dk1 board.
Configuration overview:
- SAI2A is the CPU interface used for the codec audio playback
- SAI2B is the CPU interface used for the codec audio record
- SAI2A is configured as a clock provider for the audio codec
- SAI2A&B are configured as slave of the audio codec
- SAI2A&B share the same interface of the audio codec

Note:
In master mode, cs42l51 audio codec provides a bitclock
at 64 x FS, regardless of data width. This means that
slot width is always 32 bits.
Set slot width to 32 bits and slot number to 2
in SAI2A&B endpoint nodes, to match this constraint.
dai-tdm-slot-num and dai-tdm-slot-width properties are used here,
assuming that i2s is a special case of tdm, where slot number is 2.

Signed-off-by: Olivier Moysan <olivier.moysan@st.com>
Signed-off-by: Alexandre Torgue <alexandre.torgue@st.com>

diff --git a/arch/arm/boot/dts/stm32mp157a-dk1.dts b/arch/arm/boot/dts/stm32mp157a-dk1.dts
index 279bf2f729fc351614ab647b373bcf805e6a4e5f..0615d1c8a6fcf5c0cf2ad885275d2fc3e90d4945 100644 (file)
--- a/arch/arm/boot/dts/stm32mp157a-dk1.dts
+++ b/arch/arm/boot/dts/stm32mp157a-dk1.dts
@@ -84,6 +84,17 @@ blue {
                        default-state = "off";
                };
        };
+
+       sound {
+               compatible = "audio-graph-card";
+               label = "STM32MP1-DK";
+               routing =
+                       "Playback" , "MCLK",
+                       "Capture" , "MCLK",
+                       "MICL" , "Mic Bias";
+               dais = <&sai2a_port &sai2b_port>;
+               status = "okay";
+       };
 };
 
 &cec {
@@ -152,6 +163,39 @@ sii9022_in: endpoint {
                        };
                };
        };
+
+       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 = <&gpiog 9 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;
+                       };
+               };
+       };
 };
 
 &i2c4 {
@@ -343,6 +387,51 @@ &rtc {
        status = "okay";
 };
 
+&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>;
+                       };
+               };
+       };
+};
+
 &sdmmc1 {
        pinctrl-names = "default", "opendrain", "sleep";
        pinctrl-0 = <&sdmmc1_b4_pins_a>;