linux-kernel - RE: [PATCH v3] ASoC: da7219: read fmw property to get mclk for non-dts systems

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Date:   Fri, 4 May 2018 09:15:42 +0000
From:   Adam Thomson <Adam.Thomson.Opensource@...semi.com>
To:     Akshu Agrawal <akshu.agrawal@....com>
CC:     "djkurtz@...omium.org" <djkurtz@...omium.org>,
        "Alexander.Deucher@....com" <Alexander.Deucher@....com>,
        Adam Thomson <Adam.Thomson.Opensource@...semi.com>,
        Support Opensource <Support.Opensource@...semi.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        "Takashi Iwai" <tiwai@...e.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        "moderated list:SOUND" <alsa-devel@...a-project.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v3] ASoC: da7219: read fmw property to get mclk for
 non-dts systems

On 03 May 2018 08:59, Akshu Agrawal wrote:

> Non-dts based systems can use ACPI DSDT to pass on the mclk
> to da7219.
> This enables da7219 mclk to be linked to system clock.
> Enable/Disable of the mclk is already handled in the codec so
> platform drivers don't have to explicitly do handling of mclk.
> 
> Signed-off-by: Akshu Agrawal <akshu.agrawal@....com>
> ---
> v2: Fixed kbuild error
> v3: Add corresponding clk_put for clk_get
>  include/sound/da7219.h    |  2 ++
>  sound/soc/codecs/da7219.c | 10 +++++++++-
>  2 files changed, 11 insertions(+), 1 deletion(-)
> 
> diff --git a/include/sound/da7219.h b/include/sound/da7219.h
> index 1bfcb16..df7ddf4 100644
> --- a/include/sound/da7219.h
> +++ b/include/sound/da7219.h
> @@ -38,6 +38,8 @@ struct da7219_pdata {
> 
>  	const char *dai_clks_name;
> 
> +	const char *mclk_name;
> +
>  	/* Mic */
>  	enum da7219_micbias_voltage micbias_lvl;
>  	enum da7219_mic_amp_in_sel mic_amp_in_sel;
> diff --git a/sound/soc/codecs/da7219.c b/sound/soc/codecs/da7219.c
> index 980a6a8..ecd46fc 100644
> --- a/sound/soc/codecs/da7219.c
> +++ b/sound/soc/codecs/da7219.c
> @@ -1624,6 +1624,8 @@ static struct da7219_pdata *da7219_fw_to_pdata(struct
> snd_soc_component *compone
>  		dev_warn(dev, "Using default clk name: %s\n",
>  			 pdata->dai_clks_name);
> 
> +	device_property_read_string(dev, "dlg,mclk-name", &pdata->mclk_name);
> +

Personally am still not keen on this. To me the use of a device_property_*
function suggests the same property resides in both DT and ACPI, but here we're
only using this for the ACPI case. DT has no want or need for this. I still feel
we should look at something more generic in the clock framework, although I do
agree with Mark that this should be properly specced.

>  	if (device_property_read_u32(dev, "dlg,micbias-lvl", &of_val32) >= 0)
>  		pdata->micbias_lvl = da7219_fw_micbias_lvl(dev, of_val32);
>  	else
> @@ -1905,7 +1907,10 @@ static int da7219_probe(struct snd_soc_component
> *component)
>  	da7219_handle_pdata(component);
> 
>  	/* Check if MCLK provided */
> -	da7219->mclk = devm_clk_get(component->dev, "mclk");
> +	if (da7219->pdata->mclk_name)
> +		da7219->mclk = clk_get(NULL, da7219->pdata->mclk_name);
> +	if (!da7219->mclk)
> +		da7219->mclk = devm_clk_get(component->dev, "mclk");
>  	if (IS_ERR(da7219->mclk)) {
>  		if (PTR_ERR(da7219->mclk) != -ENOENT) {
>  			ret = PTR_ERR(da7219->mclk);
> @@ -1971,6 +1976,9 @@ static void da7219_remove(struct snd_soc_component
> *component)
>  		clkdev_drop(da7219->dai_clks_lookup);
>  #endif
> 
> +	if (da7219->pdata->mclk_name)
> +		clk_put(da7219->mclk);
> +
>  	/* Supplies */
>  	regulator_bulk_disable(DA7219_NUM_SUPPLIES, da7219->supplies);
>  }
> --
> 1.9.1