Hi everyone. I'm using nvidia-jetson-tk1 board.I need work wm8978 audio codec.How to work wm8978?

Autonomous Machines Jetson & Embedded Systems Jetson TK1
1

My control interface i2c0. I used i2cdetect but not see wm8978 address

2

Hi tserensodnom, do you use TK1 or TX1?

3

I’m use TK1

4

Hi tserensodnom,
We have rt5639 on TK1 by default, so you will need to check the source files
sound/soc/tegra/tegra_rt5639.c
arch/arm/mach-tegra/board-ardbeg.c

And make relevant changes for wm8978.

5

Hi Danill my kernel configuration
kernel/sound/soc/tegra/Kconfig:
config MACH_HAS_SND_SOC_TEGRA_WM8978C
bool
help
Machines that use the SND_SOC_TEGRA_WM8978C driver should select
this config option, in order to allow the user to enable
SND_SOC_TEGRA_WM8978C.

config SND_SOC_TEGRA_WM8978C
tristate “SoC Audio support for Tegra boards using a WM8978 codec”
depends on SND_SOC_TEGRA && I2C && TEGRA_DC
depends on MACH_HAS_SND_SOC_TEGRA_WM8978C
select SND_SOC_WM8978 if SND_SOC_I2C_AND_SPI
select SND_SOC_TEGRA20_I2S if ARCH_TEGRA_2x_SOC
select SND_SOC_TEGRA30_I2S if !ARCH_TEGRA_2x_SOC
select SND_SOC_TEGRA20_SPDIF if ARCH_TEGRA_2x_SOC
select SND_SOC_TEGRA30_SPDIF if !ARCH_TEGRA_2x_SOC[url][/url]
select SND_SOC_TEGRA30_I2S if !ARCH_TEGRA_2x_SOC
//select SND_SOC_WM8978C
select SND_SOC_TEGRA30_DAM if !ARCH_TEGRA_2x_SOC
//select SND_SOC_WM8978
select SND_SOC_SPDIF
select SND_SOC_TEGRA30_AVP if !ARCH_TEGRA_2x_SOC
help
Say Y or M here if you want to add support for SoC audio on Tegra
boards using the WM8978 codec. Currently, only supported board is
Pluto.
kernel/sound/soc/tegra/Makefile:
snd-soc-tegra-wm8978-objs := tegra_wm8978.o
obj-$(CONFIG_SND_SOC_TEGRA_WM8978C) += snd-soc-tegra-wm8978.o
kernel/arch/arm/boot/dts/tegra124-jetson_tk1-pm375-000-c00-00.dts:
i2c@7000c000 {
wm8978: wm8978@1a {
#sound-dai-cells = <0>;
compatible = “wlf,wm8978”;
status = “okay”;
reg = <0x1a>;
};
};

6

My problem is do not read and write via i2c controller

7

root@tegra-ubuntu:/home/ubuntu# i2cdetect -y -r 0
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: – – – – – – – – – – – – –
10: – – – – – – – – – – UU – – – – –
20: – – – – – – – – – – – – – – – –
30: – – – – – – 36 – – – – – – – – –
40: – – – – – – – – – – – – 4c – – 4f
50: 50 – – – – – 56 – – – – – – – – –
60: – – – – – – – – – – – 6b – – – –
wm8978 slave adrress 0x1a
Result when working driver:
root@tegra-ubuntu:/home/ubuntu# i2cdump -f -y -r 0x00-0xff 0 0x1a
No size specified (using byte-data access)
0 1 2 3 4 5 6 7 8 9 a b c d e f 0123456789abcdef
00: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XXXXXXXXXXXXXXXX
10: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XXXXXXXXXXXXXXXX
20: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XXXXXXXXXXXXXXXX
30: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XXXXXXXXXXXXXXXX
40: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XXXXXXXXXXXXXXXX
50: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XXXXXXXXXXXXXXXX
60: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XXXXXXXXXXXXXXXX
70: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XXXXXXXXXXXXXXXX
80: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XXXXXXXXXXXXXXXX
90: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XXXXXXXXXXXXXXXX
a0: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XXXXXXXXXXXXXXXX
b0: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XXXXXXXXXXXXXXXX
c0: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XXXXXXXXXXXXXXXX
d0: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XXXXXXXXXXXXXXXX
e0: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XXXXXXXXXXXXXXXX
f0: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XXXXXXXXXXXXXXXX

8

Hi tserensodnom,
Do you apply the same to arch/arm/mach-tegra/board-ardbeg.c ? It reads information from the board file, not device tree.

9

How do apply board-ardbeg.c ?

10

Hi tserensodnom,
You need to check the following source codes

danel@ce-tw-daneliu:~/r21_5/kernel$ grep 'tegra-snd-rt5639' ./ -r
./arch/arm/boot/dts/tegra124-platforms/tegra124-jetson_tk1-fixed-pm375-0000-c00-00.dtsi:                                        regulator-consumer-device = "tegra-snd-rt5639.0";
./arch/arm/boot/dts/tegra124-platforms/tegra124-jetson_tk1-fixed-pm375-0000-c00-00.dtsi:                                        regulator-consumer-device = "tegra-snd-rt5639.0";
./arch/arm/boot/dts/tegra124-platforms/tegra124-jetson_tk1-fixed-pm375-0000-c00-00.dtsi:                                        regulator-consumer-device = "tegra-snd-rt5639.0";
./arch/arm/boot/dts/tegra124-platforms/tegra124-jetson_tk1-fixed-pm375-0000-c00-00.dtsi:                                        regulator-consumer-device = "tegra-snd-rt5639.0";
./arch/arm/boot/dts/tegra124-platforms/tegra124-jetson_tk1-fixed-pm375-0000-c00-00.dtsi:                                        regulator-consumer-device = "tegra-snd-rt5639.0";
./arch/arm/boot/dts/tegra124-platforms/tegra124-jetson_tk1-fixed-pm375-0000-c00-00.dtsi:                                         regulator-consumer-device = "tegra-snd-rt5639.0";
./arch/arm/mach-tegra/board-ardbeg.c:   .name = "tegra-snd-rt5639",
./sound/soc/tegra/tegra_rt5639.c:#define DRV_NAME "tegra-snd-rt5639"

and replace all ‘tegra-snd-rt5639’ with all your settings.

11

Thanks DaneL for your help