linux-kernel - Re: [PATCH v7 15/21] ASoC: tegra: Add fallback implementation for audio mclk

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Date:   Wed, 8 Jan 2020 11:04:47 +0530
From:   Sameer Pujar <spujar@...dia.com>
To:     Sowjanya Komatineni <skomatineni@...dia.com>,
        <thierry.reding@...il.com>, <jonathanh@...dia.com>,
        <broonie@...nel.org>, <lgirdwood@...il.com>, <perex@...ex.cz>,
        <tiwai@...e.com>, <digetx@...il.com>, <mperttunen@...dia.com>,
        <gregkh@...uxfoundation.org>, <sboyd@...nel.org>,
        <robh+dt@...nel.org>, <mark.rutland@....com>
CC:     <pdeschrijver@...dia.com>, <pgaikwad@...dia.com>,
        <josephl@...dia.com>, <daniel.lezcano@...aro.org>,
        <mmaddireddy@...dia.com>, <markz@...dia.com>,
        <devicetree@...r.kernel.org>, <linux-clk@...r.kernel.org>,
        <linux-tegra@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v7 15/21] ASoC: tegra: Add fallback implementation for
 audio mclk


On 1/8/2020 9:55 AM, Sowjanya Komatineni wrote:
> mclk is from clk_out_1 which is part of Tegra PMC block and pmc clocks
> are moved to Tegra PMC driver with pmc as clock provider and using pmc
> clock ids.
>
> New device tree uses clk_out_1 from pmc clock provider.
>
> So, this patch adds implementation for mclk fallback to extern1 when
> retrieving mclk returns -ENOENT to be backward compatible of new device
> tree with older kernels.
>
> Tested-by: Dmitry Osipenko <digetx@...il.com>
> Reviewed-by: Dmitry Osipenko <digetx@...il.com>
> Signed-off-by: Sowjanya Komatineni <skomatineni@...dia.com>
> ---
>   sound/soc/tegra/tegra_asoc_utils.c | 11 ++++++++++-
>   1 file changed, 10 insertions(+), 1 deletion(-)
>
> diff --git a/sound/soc/tegra/tegra_asoc_utils.c b/sound/soc/tegra/tegra_asoc_utils.c
> index 9cfebef74870..9a5f81039491 100644
> --- a/sound/soc/tegra/tegra_asoc_utils.c
> +++ b/sound/soc/tegra/tegra_asoc_utils.c
> @@ -183,7 +183,16 @@ int tegra_asoc_utils_init(struct tegra_asoc_utils_data *data,
>   	data->clk_cdev1 = devm_clk_get(dev, "mclk");
>   	if (IS_ERR(data->clk_cdev1)) {
>   		dev_err(data->dev, "Can't retrieve clk cdev1\n");

This error print can be moved inside below if, when this actually meant 
to be an error condition.

> -		return PTR_ERR(data->clk_cdev1);
> +		if (PTR_ERR(data->clk_cdev1) != -ENOENT)
> +			return PTR_ERR(data->clk_cdev1);
> +		/* Fall back to extern1 */
> +		data->clk_cdev1 = devm_clk_get(dev, "extern1");
> +		if (IS_ERR(data->clk_cdev1)) {
> +			dev_err(data->dev, "Can't retrieve clk extern1\n");
> +			return PTR_ERR(data->clk_cdev1);
> +		}
> +
> +		dev_err(data->dev, "Falling back to extern1\n");

This can be a info print?

>   	}
>   
>   	/*