linux-kernel - Re: [PATCH 3/4] mailbox: qcom: Add ipq6018 apcs compatible

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Date:   Thu, 28 May 2020 20:11:33 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Sivaprakash Murugesan <sivaprak@...eaurora.org>
Cc:     agross@...nel.org, robh+dt@...nel.org, jassisinghbrar@...il.com,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/4] mailbox: qcom: Add ipq6018 apcs compatible

On Wed 27 May 05:38 PDT 2020, Sivaprakash Murugesan wrote:

> The Qualcomm ipq6018 has apcs block, add compatible for the same.
> Also, the apcs provides a clock controller functionality similar
> to msm8916 but the clock driver is different.
> 
> Create a child platform device based on the apcs compatible for the
> clock controller functionality.
> 
> Signed-off-by: Sivaprakash Murugesan <sivaprak@...eaurora.org>
> ---
>  drivers/mailbox/qcom-apcs-ipc-mailbox.c | 23 ++++++++++++++---------
>  1 file changed, 14 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/mailbox/qcom-apcs-ipc-mailbox.c b/drivers/mailbox/qcom-apcs-ipc-mailbox.c
> index eeebafd..db3f9518 100644
> --- a/drivers/mailbox/qcom-apcs-ipc-mailbox.c
> +++ b/drivers/mailbox/qcom-apcs-ipc-mailbox.c
> @@ -45,6 +45,13 @@ static const struct mbox_chan_ops qcom_apcs_ipc_ops = {
>  	.send_data = qcom_apcs_ipc_send_data,
>  };
>  
> +static const struct of_device_id apcs_clk_match_table[] = {
> +	{ .compatible = "qcom,ipq6018-apcs-apps-global", .data = "qcom,apss-ipq6018-clk", },
> +	{ .compatible = "qcom,msm8916-apcs-kpss-global", .data = "qcom-apcs-msm8916-clk", },
> +	{ .compatible = "qcom,qcs404-apcs-apps-global",  .data = "qcom-apcs-msm8916-clk", },
> +	{}
> +};
> +
>  static int qcom_apcs_ipc_probe(struct platform_device *pdev)
>  {
>  	struct qcom_apcs_ipc *apcs;
> @@ -54,11 +61,7 @@ static int qcom_apcs_ipc_probe(struct platform_device *pdev)
>  	void __iomem *base;
>  	unsigned long i;
>  	int ret;
> -	const struct of_device_id apcs_clk_match_table[] = {
> -		{ .compatible = "qcom,msm8916-apcs-kpss-global", },
> -		{ .compatible = "qcom,qcs404-apcs-apps-global", },
> -		{}
> -	};
> +	const struct of_device_id *clk_device;
>  
>  	apcs = devm_kzalloc(&pdev->dev, sizeof(*apcs), GFP_KERNEL);
>  	if (!apcs)
> @@ -93,11 +96,12 @@ static int qcom_apcs_ipc_probe(struct platform_device *pdev)
>  		return ret;
>  	}
>  
> -	if (of_match_device(apcs_clk_match_table, &pdev->dev)) {
> +	clk_device = of_match_device(apcs_clk_match_table, &pdev->dev);

I think you should replace the direct integer in qcom_apcs_ipc_of_match
with a small struct containing offset and the clock device's name -
allowing the latter to be omitted.

That avoids the apcs_clk_match_table being unreferenced when this is
compiled without CONFIG_OF and it removes the need for two of_device_id
arrays.

Regards,
Bjorn

> +	if (clk_device) {
>  		apcs->clk = platform_device_register_data(&pdev->dev,
> -							  "qcom-apcs-msm8916-clk",
> -							  PLATFORM_DEVID_NONE,
> -							  NULL, 0);
> +							clk_device->data,
> +							PLATFORM_DEVID_NONE,
> +							NULL, 0);
>  		if (IS_ERR(apcs->clk))
>  			dev_err(&pdev->dev, "failed to register APCS clk\n");
>  	}
> @@ -126,6 +130,7 @@ static const struct of_device_id qcom_apcs_ipc_of_match[] = {
>  	{ .compatible = "qcom,sc7180-apss-shared", .data = (void *)12 },
>  	{ .compatible = "qcom,sdm845-apss-shared", .data = (void *)12 },
>  	{ .compatible = "qcom,sm8150-apss-shared", .data = (void *)12 },
> +	{ .compatible = "qcom,ipq6018-apcs-apps-global", .data = (void *)8 },
>  	{ .compatible = "qcom,ipq8074-apcs-apps-global", .data = (void *)8 },
>  	{}
>  };
> -- 
> 2.7.4
>