linux-kernel - Re: [PATCH v3 2/3] firmware: qcom: scm: Remove core, iface and bus clocks dependency

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Message-ID: <20161118195917.GN28340@tuxbot>
Date:   Fri, 18 Nov 2016 11:59:17 -0800
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Sarangdhar Joshi <spjoshi@...eaurora.org>
Cc:     Andy Gross <andy.gross@...aro.org>,
        David Brown <david.brown@...aro.org>,
        linux-arm-msm@...r.kernel.org, linux-soc@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Jordan Crouse <jcrouse@...eaurora.org>,
        Stephen Boyd <sboyd@...eaurora.org>,
        Trilok Soni <tsoni@...eaurora.org>
Subject: Re: [PATCH v3 2/3] firmware: qcom: scm: Remove core, iface and bus
 clocks dependency

On Tue 15 Nov 17:19 PST 2016, Sarangdhar Joshi wrote:

> Core, iface and bus clocks are not required to be voted from SCM
> driver for some of the Qualcomm chipsets. Remove dependency on
> these clocks from driver.
> 
> Suggested-by: Bjorn Andersson <bjorn.andersson@...aro.org>

Acked-by: Bjorn Andersson <bjorn.andersson@...aro.org>

Regards,
Bjorn

> Signed-off-by: Sarangdhar Joshi <spjoshi@...eaurora.org>
> ---
>  drivers/firmware/qcom_scm.c | 49 ++++++++++++++++++++++++++++++++++-----------
>  1 file changed, 37 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/firmware/qcom_scm.c b/drivers/firmware/qcom_scm.c
> index d79fecd..ddf7c8b 100644
> --- a/drivers/firmware/qcom_scm.c
> +++ b/drivers/firmware/qcom_scm.c
> @@ -28,6 +28,10 @@
>  
>  #include "qcom_scm.h"
>  
> +#define SCM_HAS_CORE_CLK	BIT(0)
> +#define SCM_HAS_IFACE_CLK	BIT(1)
> +#define SCM_HAS_BUS_CLK		BIT(2)
> +
>  struct qcom_scm {
>  	struct device *dev;
>  	struct clk *core_clk;
> @@ -380,32 +384,40 @@ EXPORT_SYMBOL(qcom_scm_is_available);
>  static int qcom_scm_probe(struct platform_device *pdev)
>  {
>  	struct qcom_scm *scm;
> +	unsigned long clks;
>  	int ret;
>  
>  	scm = devm_kzalloc(&pdev->dev, sizeof(*scm), GFP_KERNEL);
>  	if (!scm)
>  		return -ENOMEM;
>  
> -	scm->core_clk = devm_clk_get(&pdev->dev, "core");
> -	if (IS_ERR(scm->core_clk)) {
> -		if (PTR_ERR(scm->core_clk) == -EPROBE_DEFER)
> -			return PTR_ERR(scm->core_clk);
> +	clks = (unsigned long)of_device_get_match_data(&pdev->dev);
> +	if (clks & SCM_HAS_CORE_CLK) {
> +		scm->core_clk = devm_clk_get(&pdev->dev, "core");
> +		if (IS_ERR(scm->core_clk)) {
> +			if (PTR_ERR(scm->core_clk) == -EPROBE_DEFER)
> +				return PTR_ERR(scm->core_clk);
>  
> -		scm->core_clk = NULL;
> +			scm->core_clk = NULL;
> +		}
>  	}
>  
> -	if (of_device_is_compatible(pdev->dev.of_node, "qcom,scm")) {
> +	if (clks & SCM_HAS_IFACE_CLK) {
>  		scm->iface_clk = devm_clk_get(&pdev->dev, "iface");
>  		if (IS_ERR(scm->iface_clk)) {
>  			if (PTR_ERR(scm->iface_clk) != -EPROBE_DEFER)
> -				dev_err(&pdev->dev, "failed to acquire iface clk\n");
> +				dev_err(&pdev->dev,
> +					"failed to acquire iface clk\n");
>  			return PTR_ERR(scm->iface_clk);
>  		}
> +	}
>  
> +	if (clks & SCM_HAS_BUS_CLK) {
>  		scm->bus_clk = devm_clk_get(&pdev->dev, "bus");
>  		if (IS_ERR(scm->bus_clk)) {
>  			if (PTR_ERR(scm->bus_clk) != -EPROBE_DEFER)
> -				dev_err(&pdev->dev, "failed to acquire bus clk\n");
> +				dev_err(&pdev->dev,
> +					"failed to acquire bus clk\n");
>  			return PTR_ERR(scm->bus_clk);
>  		}
>  	}
> @@ -429,10 +441,23 @@ static int qcom_scm_probe(struct platform_device *pdev)
>  }
>  
>  static const struct of_device_id qcom_scm_dt_match[] = {
> -	{ .compatible = "qcom,scm-apq8064",},
> -	{ .compatible = "qcom,scm-msm8660",},
> -	{ .compatible = "qcom,scm-msm8960",},
> -	{ .compatible = "qcom,scm",},
> +	{ .compatible = "qcom,scm-apq8064",
> +	  .data = (void *) SCM_HAS_CORE_CLK,
> +	},
> +	{ .compatible = "qcom,scm-msm8660",
> +	  .data = (void *) SCM_HAS_CORE_CLK,
> +	},
> +	{ .compatible = "qcom,scm-msm8960",
> +	  .data = (void *) SCM_HAS_CORE_CLK,
> +	},
> +	{ .compatible = "qcom,scm-msm8996",
> +	  .data = NULL, /* no clocks */
> +	},
> +	{ .compatible = "qcom,scm",
> +	  .data = (void *)(SCM_HAS_CORE_CLK
> +			   | SCM_HAS_IFACE_CLK
> +			   | SCM_HAS_BUS_CLK),
> +	},
>  	{}
>  };
>  
> -- 
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project
>