linux-kernel - Re: [PATCH 04/11] ASoC: qcom: lpass-cpu: Make "ahbix-clk" an optional clock.

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Date:   Thu, 16 Apr 2020 08:56:26 +0100
From:   Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To:     Ajit Pandey <ajitp@...eaurora.org>, alsa-devel@...a-project.org,
        broonie@...nel.org, devicetree@...r.kernel.org,
        plai@...eaurora.org, bgoswami@...eaurora.org
Cc:     linux-kernel@...r.kernel.org, tiwai@...e.com
Subject: Re: [PATCH 04/11] ASoC: qcom: lpass-cpu: Make "ahbix-clk" an optional
 clock.



On 11/04/2020 09:02, Ajit Pandey wrote:
> AHB-I/X bus clocks inside LPASS coreis not a mandatory clocks for
s/coreis/core is/
> newer lpass variants, hence make it an optional one.
> 

Can you add more detail on which version of IP would not have this clk.

> Signed-off-by: Ajit Pandey <ajitp@...eaurora.org>
> ---
>   sound/soc/qcom/lpass-cpu.c | 31 ++++++++++++++++++-------------
>   1 file changed, 18 insertions(+), 13 deletions(-)
> 
> diff --git a/sound/soc/qcom/lpass-cpu.c b/sound/soc/qcom/lpass-cpu.c
> index 492f27b..f177932 100644
> --- a/sound/soc/qcom/lpass-cpu.c
> +++ b/sound/soc/qcom/lpass-cpu.c
> @@ -504,26 +504,31 @@ int asoc_qcom_lpass_cpu_platform_probe(struct platform_device *pdev)
>   		return ret;
>   	}
>   
> -	drvdata->ahbix_clk = devm_clk_get(&pdev->dev, "ahbix-clk");
> +	drvdata->ahbix_clk = devm_clk_get_optional(&pdev->dev, "ahbix-clk");
>   	if (IS_ERR(drvdata->ahbix_clk)) {
>   		dev_err(&pdev->dev, "error getting ahbix-clk: %ld\n",
>   			PTR_ERR(drvdata->ahbix_clk));
>   		return PTR_ERR(drvdata->ahbix_clk);
>   	}
>   
> -	ret = clk_set_rate(drvdata->ahbix_clk, LPASS_AHBIX_CLOCK_FREQUENCY);
> -	if (ret) {
> -		dev_err(&pdev->dev, "error setting rate on ahbix_clk: %d\n",
> -			ret);
> -		return ret;
> -	}
> -	dev_dbg(&pdev->dev, "set ahbix_clk rate to %lu\n",
> -		clk_get_rate(drvdata->ahbix_clk));
> +	if (drvdata->ahbix_clk != NULL) {

No need for NULL checks here, clk apis already have checks.

--srini

> +		ret = clk_set_rate(drvdata->ahbix_clk,
> +				   LPASS_AHBIX_CLOCK_FREQUENCY);
> +		if (ret) {
> +			dev_err(&pdev->dev,
> +				"error setting rate on ahbix_clk: %d\n", ret);
> +			return ret;
> +		}
>   
> -	ret = clk_prepare_enable(drvdata->ahbix_clk);
> -	if (ret) {
> -		dev_err(&pdev->dev, "error enabling ahbix_clk: %d\n", ret);
> -		return ret;
> +		dev_dbg(&pdev->dev, "set ahbix_clk rate to %lu\n",
> +			clk_get_rate(drvdata->ahbix_clk));
> +
> +		ret = clk_prepare_enable(drvdata->ahbix_clk);
> +		if (ret) {
> +			dev_err(&pdev->dev,
> +				"error enabling ahbix_clk: %d\n", ret);
> +			return ret;
> +		}
>   	}
>   
>   	ret = devm_snd_soc_register_component(&pdev->dev,
>