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

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Date:   Wed, 13 Jul 2022 22:33:44 +0800
From:   Zhou Yanjie <zhouyu@...yeetech.com>
To:     Aidan MacDonald <aidanmacdonald.0x0@...il.com>,
        paul@...pouillou.net, lgirdwood@...il.com, broonie@...nel.org,
        perex@...ex.cz, tiwai@...e.com
Cc:     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 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.


>   
>   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 = {