linux-kernel - Re: [PATCH v4 07/11] ASoC: jz4740-i2s: Make the PLL clock name SoC-specific

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Message-Id: <ROSYER.QTJF8J14H2YX1@crapouillou.net>
Date:   Wed, 13 Jul 2022 16:07:39 +0100
From:   Paul Cercueil <paul@...pouillou.net>
To:     Zhou Yanjie <zhouyu@...yeetech.com>
Cc:     Aidan MacDonald <aidanmacdonald.0x0@...il.com>,
        lgirdwood@...il.com, broonie@...nel.org, perex@...ex.cz,
        tiwai@...e.com, linux-mips@...r.kernel.org,
        alsa-devel@...a-project.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 07/11] ASoC: jz4740-i2s: Make the PLL clock name
 SoC-specific

Hi Zhou,

Le mer., juil. 13 2022 at 22:33:44 +0800, Zhou Yanjie 
<zhouyu@...yeetech.com> a écrit :
> Hi Aidan,
> 
> On 2022/7/9 上午12:02, Aidan MacDonald wrote:
>> On some Ingenic SoCs, such as the X1000, there is a programmable
>> divider used to generate the I2S system clock from a PLL, rather
>> than a fixed PLL/2 clock. It doesn't make much sense to call the
>> clock "pll half" on those SoCs, so the clock name should really be
>> a SoC-dependent value.
>> 
>> Signed-off-by: Aidan MacDonald <aidanmacdonald.0x0@...il.com>
>> ---
>>   sound/soc/jz4740/jz4740-i2s.c | 8 +++++++-
>>   1 file changed, 7 insertions(+), 1 deletion(-)
>> 
>> diff --git a/sound/soc/jz4740/jz4740-i2s.c 
>> b/sound/soc/jz4740/jz4740-i2s.c
>> index 0dcc658b3784..a41398c24d0e 100644
>> --- a/sound/soc/jz4740/jz4740-i2s.c
>> +++ b/sound/soc/jz4740/jz4740-i2s.c
>> @@ -75,6 +75,8 @@ struct i2s_soc_info {
>>   	struct reg_field field_i2sdiv_capture;
>>   	struct reg_field field_i2sdiv_playback;
>>   +	const char *pll_clk_name;
>> +
>>   	bool shared_fifo_flush;
>>   };
>>   @@ -281,7 +283,7 @@ static int jz4740_i2s_set_sysclk(struct 
>> snd_soc_dai *dai, int clk_id,
>>   		clk_set_parent(i2s->clk_i2s, parent);
>>   		break;
>>   	case JZ4740_I2S_CLKSRC_PLL:
>> -		parent = clk_get(NULL, "pll half");
>> +		parent = clk_get(NULL, i2s->soc_info->pll_clk_name);
>>   		if (IS_ERR(parent))
>>   			return PTR_ERR(parent);
>>   		clk_set_parent(i2s->clk_i2s, parent);
>> @@ -400,6 +402,7 @@ static const struct i2s_soc_info 
>> jz4740_i2s_soc_info = {
>>   	.field_tx_fifo_thresh	= REG_FIELD(JZ_REG_AIC_CONF, 8, 11),
>>   	.field_i2sdiv_capture	= REG_FIELD(JZ_REG_AIC_CLK_DIV, 0, 3),
>>   	.field_i2sdiv_playback	= REG_FIELD(JZ_REG_AIC_CLK_DIV, 0, 3),
>> +	.pll_clk_name		= "pll half",
>>   	.shared_fifo_flush	= true,
>>   };
>>   @@ -409,6 +412,7 @@ static const struct i2s_soc_info 
>> jz4760_i2s_soc_info = {
>>   	.field_tx_fifo_thresh	= REG_FIELD(JZ_REG_AIC_CONF, 16, 20),
>>   	.field_i2sdiv_capture	= REG_FIELD(JZ_REG_AIC_CLK_DIV, 0, 3),
>>   	.field_i2sdiv_playback	= REG_FIELD(JZ_REG_AIC_CLK_DIV, 0, 3),
>> +	.pll_clk_name		= "pll half",
>>   };
> 
> 
> Since JZ4760, according to the description of the I2SCDR register,
> Ingenic SoCs no longer use PLL/2 clock, but directly use PLL clock,
> so it seems also inappropriate to use "pll half" for these SoCs.

The device tree passes the clock as "pll half". So the driver should 
use this name as well...

Cheers,
-Paul

>>     static struct snd_soc_dai_driver jz4770_i2s_dai = {
>> @@ -435,6 +439,7 @@ static const struct i2s_soc_info 
>> jz4770_i2s_soc_info = {
>>   	.field_tx_fifo_thresh	= REG_FIELD(JZ_REG_AIC_CONF, 16, 20),
>>   	.field_i2sdiv_capture	= REG_FIELD(JZ_REG_AIC_CLK_DIV, 8, 11),
>>   	.field_i2sdiv_playback	= REG_FIELD(JZ_REG_AIC_CLK_DIV, 0, 3),
>> +	.pll_clk_name		= "pll half",
>>   };
> 
> 
> Same here.
> 
> 
>>     static const struct i2s_soc_info jz4780_i2s_soc_info = {
>> @@ -443,6 +448,7 @@ static const struct i2s_soc_info 
>> jz4780_i2s_soc_info = {
>>   	.field_tx_fifo_thresh	= REG_FIELD(JZ_REG_AIC_CONF, 16, 20),
>>   	.field_i2sdiv_capture	= REG_FIELD(JZ_REG_AIC_CLK_DIV, 8, 11),
>>   	.field_i2sdiv_playback	= REG_FIELD(JZ_REG_AIC_CLK_DIV, 0, 3),
>> +	.pll_clk_name		= "pll half",
>>   };
>> 
> 
> Same here.
> 
> 
> Thanks and best regards!
> 
> 
>>   static const struct snd_soc_component_driver jz4740_i2s_component 
>> = {