linux-kernel - Re: [PATCH 3/6] soc: qcom: ocmem: make iface clock optional

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Message-ID: <c9d319a6-36c6-b58c-70ce-65578fd364c3@linaro.org>
Date:   Mon, 8 May 2023 14:34:23 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Luca Weiss <luca@...tu.xyz>, ~postmarketos/upstreaming@...ts.sr.ht,
        phone-devel@...r.kernel.org, Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Rob Clark <robdclark@...il.com>,
        Brian Masney <masneyb@...tation.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>
Cc:     linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH 3/6] soc: qcom: ocmem: make iface clock optional

On 07/05/2023 12:12, Luca Weiss wrote:
> Some platforms such as msm8226 do not have an iface clk. Since clk_bulk
> APIs don't offer to a way to treat some clocks as optional simply add
> core_clk and iface_clk members to our drvdata.

What about using devm_clk_bulk_get_optional()? I think it would be 
simpler this way.

> 
> Signed-off-by: Luca Weiss <luca@...tu.xyz>
> ---
>   drivers/soc/qcom/ocmem.c | 42 ++++++++++++++++++++++++------------------
>   1 file changed, 24 insertions(+), 18 deletions(-)
> 
> diff --git a/drivers/soc/qcom/ocmem.c b/drivers/soc/qcom/ocmem.c
> index a11a955a1327..6235065d3bc9 100644
> --- a/drivers/soc/qcom/ocmem.c
> +++ b/drivers/soc/qcom/ocmem.c
> @@ -54,6 +54,8 @@ struct ocmem {
>   	const struct ocmem_config *config;
>   	struct resource *memory;
>   	void __iomem *mmio;
> +	struct clk *core_clk;
> +	struct clk *iface_clk;
>   	unsigned int num_ports;
>   	unsigned int num_macros;
>   	bool interleaved;
> @@ -91,16 +93,6 @@ struct ocmem {
>   #define OCMEM_PSGSC_CTL_MACRO2_MODE(val)	FIELD_PREP(0x00000700, (val))
>   #define OCMEM_PSGSC_CTL_MACRO3_MODE(val)	FIELD_PREP(0x00007000, (val))
>   
> -#define OCMEM_CLK_CORE_IDX			0
> -static struct clk_bulk_data ocmem_clks[] = {
> -	{
> -		.id = "core",
> -	},
> -	{
> -		.id = "iface",
> -	},
> -};
> -
>   static inline void ocmem_write(struct ocmem *ocmem, u32 reg, u32 data)
>   {
>   	writel(data, ocmem->mmio + reg);
> @@ -316,9 +308,15 @@ static int ocmem_dev_probe(struct platform_device *pdev)
>   	ocmem->dev = dev;
>   	ocmem->config = device_get_match_data(dev);
>   
> -	ret = devm_clk_bulk_get(dev, ARRAY_SIZE(ocmem_clks), ocmem_clks);
> -	if (ret)
> -		return dev_err_probe(dev, ret, "Unable to get clocks\n");
> +	ocmem->core_clk = devm_clk_get(dev, "core");
> +	if (IS_ERR(ocmem->core_clk))
> +		return dev_err_probe(dev, PTR_ERR(ocmem->core_clk),
> +				     "Unable to get core clock\n");
> +
> +	ocmem->iface_clk = devm_clk_get_optional(dev, "iface");
> +	if (IS_ERR(ocmem->iface_clk))
> +		return dev_err_probe(dev, PTR_ERR(ocmem->iface_clk),
> +				     "Unable to get iface clock\n");
>   
>   	ocmem->mmio = devm_platform_ioremap_resource_byname(pdev, "ctrl");
>   	if (IS_ERR(ocmem->mmio))
> @@ -333,11 +331,15 @@ static int ocmem_dev_probe(struct platform_device *pdev)
>   	}
>   
>   	/* The core clock is synchronous with graphics */
> -	WARN_ON(clk_set_rate(ocmem_clks[OCMEM_CLK_CORE_IDX].clk, 1000) < 0);
> +	WARN_ON(clk_set_rate(ocmem->core_clk, 1000) < 0);
> +
> +	ret = clk_prepare_enable(ocmem->core_clk);
> +	if (ret)
> +		return dev_err_probe(ocmem->dev, ret, "Failed to enable core clock\n");
>   
> -	ret = clk_bulk_prepare_enable(ARRAY_SIZE(ocmem_clks), ocmem_clks);
> +	ret = clk_prepare_enable(ocmem->iface_clk);
>   	if (ret)
> -		return dev_err_probe(ocmem->dev, ret, "Failed to enable clocks\n");
> +		return dev_err_probe(ocmem->dev, ret, "Failed to enable iface clock\n");
>   
>   	if (qcom_scm_restore_sec_cfg_available()) {
>   		dev_dbg(dev, "configuring scm\n");
> @@ -396,13 +398,17 @@ static int ocmem_dev_probe(struct platform_device *pdev)
>   	return 0;
>   
>   err_clk_disable:
> -	clk_bulk_disable_unprepare(ARRAY_SIZE(ocmem_clks), ocmem_clks);
> +	clk_disable_unprepare(ocmem->core_clk);
> +	clk_disable_unprepare(ocmem->iface_clk);
>   	return ret;
>   }
>   
>   static int ocmem_dev_remove(struct platform_device *pdev)
>   {
> -	clk_bulk_disable_unprepare(ARRAY_SIZE(ocmem_clks), ocmem_clks);
> +	struct ocmem *ocmem = platform_get_drvdata(pdev);
> +
> +	clk_disable_unprepare(ocmem->core_clk);
> +	clk_disable_unprepare(ocmem->iface_clk);
>   
>   	return 0;
>   }
> 

-- 
With best wishes
Dmitry