linux-kernel - Re: [PATCH 09/11] ASoC: jz4740-i2s: Make the PLL clock name SoC-specific

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Date:   Thu, 07 Jul 2022 15:24:52 +0100
From:   Aidan MacDonald <aidanmacdonald.0x0@...il.com>
To:     Paul Cercueil <paul@...pouillou.net>
Cc:     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 09/11] ASoC: jz4740-i2s: Make the PLL clock name
 SoC-specific


Paul Cercueil <paul@...pouillou.net> writes:

> Le mer., juil. 6 2022 at 22:13:28 +0100, Aidan MacDonald
> <aidanmacdonald.0x0@...il.com> a écrit :
>> 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.
>
> Do you really need the .set_sysclk() callback? I've never seen it used on any
> of the Ingenic boards I have, so to me it's pretty much dead code. Unless you
> do use this callback, I'd suggest to drop this patch until you do need it.
>
> Cheers,
> -Paul
>

Yes, one of my boards has an external codec (AK4376) that needs the
sysclock and I've patched simple-card to be able to set a non-zero
sysclock ID.

>> 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 3a21ee9d34d1..80b355d715ce 100644
>> --- a/sound/soc/jz4740/jz4740-i2s.c
>> +++ b/sound/soc/jz4740/jz4740-i2s.c
>> @@ -71,6 +71,8 @@ struct i2s_soc_info {
>>  	struct reg_field field_tx_fifo_thresh;
>>  	struct reg_field field_i2sdiv_capture;
>>  	struct reg_field field_i2sdiv_playback;
>> +
>> +	const char *pll_clk_name;
>>  };
>>  struct jz4740_i2s {
>> @@ -265,7 +267,7 @@ 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);
>> @@ -387,6 +389,7 @@ 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",
>>  };
>>  static const struct i2s_soc_info jz4760_i2s_soc_info = {
>> @@ -395,6 +398,7 @@ 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",
>>  };
>>  static struct snd_soc_dai_driver jz4770_i2s_dai = {
>> @@ -421,6 +425,7 @@ 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",
>>  };
>>  static const struct i2s_soc_info jz4780_i2s_soc_info = {
>> @@ -429,6 +434,7 @@ 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",
>>  };
>>  static const struct snd_soc_component_driver jz4740_i2s_component = {
>> --
>> 2.35.1
>>