[PATCH] arm64: dts: rockchip: add rock-pi-4 analog audio

[Adrian Ratiu]

Hi Alex,

On Tue, 29 Jun 2021, Alex Bee <knaerzche at gmail.com> wrote:
> Hi Adrian, 
> 
> I've submitted similar patch already. Its part of [1]

Thank you for pointing out your patch, I was not aware of it as it 
was not merged yet (I tested latest linux-next).

It is a good sign that our code is almost identical except for the 
headphone detect pin which you mention.
 
> 
> There is no headphone detection pin in the schematics, btw. 
>

There are two reasons I added it:

1. The es8316 codec failed to probe() in my testing unless the irq 
was defined. That might have been due to me testing the codec 
directly with the simple card driver instead of the graph driver.

Point 1 doesn't appear to be an issue anymore, the codec + graph 
driver probe correctly and audio supposedly (see below) works even 
without the irq.

2. I got the gpio bank 1 pin 0 location from various headphone 
detection commits in the vendor v4.4 kernel, like for example [1].

Are you 100% sure there is no hp detection pin wired on the 
rock-pi-4? 

Even if it might be missing from the schematics, the vendor driver 
code apparently defines and uses it?

>From booting with the irq defined I get the following in 
/proc/interrupts however I'm having an unrelated difficulty 
testing because the audio connector literally broke off the board 
like in [2]. 

90: 1  0  0  0  0  rockchip_gpio_irq   0 Level     es8316

Team Radxa was very nice in offering me a replacement but until 
that arrives I can't test this anymore.

[1] 
https://github.com/radxa/kernel/commit/e945cad5c3ec82d171760465d3c7a84bb10ed1b7

[2] https://forum.radxa.com/t/audio-jack-broke-off/935

> [1] 
> https://patchwork.kernel.org/project/linux-rockchip/cover/20210618181256.27992-1-knaerzche@gmail.com/
>
> Best,
>
> Alex
>
> Am 28.06.21 um 13:30 schrieb Adrian Ratiu:
>> This adds the necessary pinctrl and nodes to enable the
>> analog audio on rk3399 rock-pi-4 SBCs using the es8316
>> codec and the audio-graph-card driver.
>>
>> Signed-off-by: Adrian Ratiu <adrian.ratiu at collabora.com>
>> ---
>>   .../boot/dts/rockchip/rk3399-rock-pi-4.dtsi   | 38 +++++++++++++++++++
>>   1 file changed, 38 insertions(+)
>>
>> diff --git a/arch/arm64/boot/dts/rockchip/rk3399-rock-pi-4.dtsi b/arch/arm64/boot/dts/rockchip/rk3399-rock-pi-4.dtsi
>> index b28888ea9262..77781d9150ac 100644
>> --- a/arch/arm64/boot/dts/rockchip/rk3399-rock-pi-4.dtsi
>> +++ b/arch/arm64/boot/dts/rockchip/rk3399-rock-pi-4.dtsi
>> @@ -128,6 +128,12 @@ vdd_log: vdd-log {
>>   		regulator-max-microvolt = <1400000>;
>>   		vin-supply = <&vcc5v0_sys>;
>>   	};
>> +
>> +	sound {
>> +		compatible = "audio-graph-card";
>> +		label = "rockchip,rk3399";
>> +		dais = <&i2s0_p0>;
>> +	};
>>   };
>>   
>>   &cpu_l0 {
>> @@ -422,6 +428,24 @@ &i2c1 {
>>   	i2c-scl-rising-time-ns = <300>;
>>   	i2c-scl-falling-time-ns = <15>;
>>   	status = "okay";
>> +
>> +	es8316: codec at 11 {
>> +		compatible = "everest,es8316";
>> +		reg = <0x11>;
>> +		clocks = <&cru SCLK_I2S_8CH_OUT>;
>> +		clock-names = "mclk";
>> +		pinctrl-names = "default";
>> +		pinctrl-0 = <&hp_det_pin>;
>> +		interrupt-parent = <&gpio1>;
>> +		interrupts = <RK_PA0 IRQ_TYPE_LEVEL_HIGH>;
>> +		#sound-dai-cells = <0>;
>> +
>> +		port {
>> +			es8316_p0_0: endpoint {
>> +				remote-endpoint = <&i2s0_p0_0>;
>> +			};
>> +		};
>> +	};
>>   };
>>   
>>   &i2c3 {
>> @@ -441,6 +465,14 @@ &i2s0 {
>>   	rockchip,capture-channels = <2>;
>>   	rockchip,playback-channels = <2>;
>>   	status = "okay";
>> +
>> +	i2s0_p0: port {
>> +		i2s0_p0_0: endpoint {
>> +			dai-format = "i2s";
>> +			mclk-fs = <256>;
>> +			remote-endpoint = <&es8316_p0_0>;
>> +		};
>> +	};
>>   };
>>   
>>   &i2s1 {
>> @@ -556,6 +588,12 @@ wifi_host_wake_l: wifi-host-wake-l {
>>   			rockchip,pins = <0 RK_PA3 RK_FUNC_GPIO &pcfg_pull_none>;
>>   		};
>>   	};
>> +
>> +	es8316 {
>> +		hp_det_pin: hp-det-pin {
>> +			rockchip,pins = <1 RK_PA0 RK_FUNC_GPIO &pcfg_pull_up>;
>> +		};
>> +	};
>>   };
>>   
>>   &pwm2 {