ASoC: rockchip: i2s-tdm: Add support for TDM_MULTI_LANES

Example: RK3588

Use I2S2_2CH as Clk-Gen to serve TDM_MULTI_LANES

I2S2_2CH ----> BCLK,I2S_LRCK --------> I2S0_8CH_TX (Slave TRCM-TXONLY)
    |
    |--------> BCLK,TDM_SYNC --------> TDM Device (Slave)

Note:

I2S2_2CH_MCLK: BCLK
I2S2_2CH_SCLK: I2S_LRCK (GPIO2_B7)
I2S2_2CH_LRCK: TDM_SYNC (GPIO2_C0)

DT:

&i2s0_8ch {
       status = "okay";
       assigned-clocks = <&cru I2S0_8CH_MCLKOUT>;
       assigned-clock-parents = <&cru MCLK_I2S0_8CH_TX>;
       i2s-lrck-gpio = <&gpio1 RK_PC5 GPIO_ACTIVE_HIGH>;
       tdm-fsync-gpio = <&gpio1 RK_PC2 GPIO_ACTIVE_HIGH>;
       rockchip,tdm-multi-lanes;
       rockchip,tdm-tx-lanes = <2>; //e.g. TDM16 x 2
       rockchip,tdm-rx-lanes = <2>; //e.g. TDM16 x 2
       rockchip,clk-src = <&i2s2_2ch>;
       pinctrl-names = "default";
       pinctrl-0 = <&i2s0_lrck
                    &i2s0_sclk
                    &i2s0_sdi0
                    &i2s0_sdi1
                    &i2s0_sdo0
                    &i2s0_sdo1>;
};

&i2s2_2ch {
       status = "okay";
       assigned-clocks = <&cru I2S2_2CH_MCLKOUT>;
       assigned-clock-parents = <&cru MCLK_I2S2_2CH>;
       pinctrl-names = "default";
       pinctrl-0 = <&i2s2m0_mclk
                    &i2s2m0_lrck
                    &i2s2m0_sclk>;
};

Usage: TDM16 x 2 Playback

amixer contents

numid=3,iface=MIXER,name='Receive SDIx Select'
  ; type=ENUMERATED,access=rw------,values=1,items=5
  ; Item #0 'Auto'
  ; Item #1 'SDIx1'
  ; Item #2 'SDIx2'
  ; Item #3 'SDIx3'
  ; Item #4 'SDIx4'
  : values=0
numid=2,iface=MIXER,name='Transmit SDOx Select'
  ; type=ENUMERATED,access=rw------,values=1,items=5
  ; Item #0 'Auto'
  ; Item #1 'SDOx1'
  ; Item #2 'SDOx2'
  ; Item #3 'SDOx3'
  ; Item #4 'SDOx4'
  : values=0

/# amixer sset "Transmit SDOx Select" "SDOx2"
Simple mixer control 'Transmit SDOx Select',0
  Capabilities: enum
  Items: 'Auto' 'SDOx1' 'SDOx2' 'SDOx3' 'SDOx4'
  Item0: 'SDOx2'

/# aplay -D hw:0,0 --period-size=1024 --buffer-size=4096 -r 48000 \
   -c 32 -f s32_le /dev/zero

Signed-off-by: Sugar Zhang <sugar.zhang@rock-chips.com>
Change-Id: I6996e05c73a9d68bbeb9562eb6e68e4c99b52d85

sound/soc/rockchip/Kconfig

@@ -32,6 +32,13 @@ config SND_SOC_ROCKCHIP_I2S_TDM
 	  Rockchip I2S/TDM device. The device supports up to maximum of
 	  8 channels each for play and record.
 
+config SND_SOC_ROCKCHIP_I2S_TDM_MULTI_LANES
+	bool "Rockchip TDM Multi Lanes"
+	depends on SND_SOC_ROCKCHIP_I2S_TDM
+	help
+	  Say Y or M if you want to add support for TDM Multi Lanes
+	  based on I2S_TDM controller.
+
 config SND_SOC_ROCKCHIP_MULTI_DAIS
 	tristate "Rockchip Multi-DAIS Device Driver"
 	depends on CLKDEV_LOOKUP && SND_SOC_ROCKCHIP