linux-kernel - Re: [PATCH 2/2] clk: qcom: Add MSM8226 Multimedia Clock Controller support

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Date:   Mon, 6 Dec 2021 10:12:20 -0600
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Bartosz Dudziak <bartosz.dudziak@...jp.pl>
Cc:     Andy Gross <agross@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Jeffrey Hugo <jhugo@...eaurora.org>,
        Taniya Das <tdas@...eaurora.org>,
        linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        ~postmarketos/upstreaming@...ts.sr.ht
Subject: Re: [PATCH 2/2] clk: qcom: Add MSM8226 Multimedia Clock Controller
 support

On Fri 12 Nov 19:58 CST 2021, Bartosz Dudziak wrote:
> diff --git a/drivers/clk/qcom/mmcc-msm8974.c b/drivers/clk/qcom/mmcc-msm8974.c
[..]
>  static int mmcc_msm8974_probe(struct platform_device *pdev)
>  {
>  	struct regmap *regmap;
> +	const struct of_device_id *match;
> +
> +	match = of_match_device(mmcc_msm8974_match_table, &pdev->dev);

Could you please use of_device_get_match_data() instead?

> +	if (!match)

As a general suggestion; I don't see how we would end up here with
!match, but if we somehow do it would be during development and you
would have an easier time debugging this by hitting a NULL pointer
dereference with a callstack, than tracking down why your clocks are
missing...

Thanks,
Bjorn

> +		return -ENODEV;
>  
> -	regmap = qcom_cc_map(pdev, &mmcc_msm8974_desc);
> +	regmap = qcom_cc_map(pdev, match->data);
>  	if (IS_ERR(regmap))
>  		return PTR_ERR(regmap);
>  
> -	clk_pll_configure_sr_hpm_lp(&mmpll1, regmap, &mmpll1_config, true);
> -	clk_pll_configure_sr_hpm_lp(&mmpll3, regmap, &mmpll3_config, false);
> +	if (match->data == &mmcc_msm8974_desc) {
> +		clk_pll_configure_sr_hpm_lp(&mmpll1, regmap, &mmpll1_config, true);
> +		clk_pll_configure_sr_hpm_lp(&mmpll3, regmap, &mmpll3_config, false);
> +	} else {
> +		msm8226_clock_override();
> +	}
>  
> -	return qcom_cc_really_probe(pdev, &mmcc_msm8974_desc, regmap);
> +	return qcom_cc_really_probe(pdev, match->data, regmap);
>  }
>  
>  static struct platform_driver mmcc_msm8974_driver = {
> -- 
> 2.25.1
>