linux-kernel - Re: [PATCH] clk: qcom: Make oxili GDSC parent of oxili

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Date:	Thu, 01 Oct 2015 13:53:44 +0530
From:	Rajendra Nayak <rnayak@...eaurora.org>
To:	Stephen Boyd <sboyd@...eaurora.org>,
	Mike Turquette <mturquette@...libre.com>
CC:	linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org,
	linux-arm-msm@...r.kernel.org, linux-pm@...r.kernel.org
Subject: Re: [PATCH] clk: qcom: Make oxili GDSC parent of oxili_cx GDSC

On 09/24/2015 12:39 AM, Stephen Boyd wrote:
> The oxili_cx GDSC is inside the power domain of the oxili GDSC.
> Add the dependency so that the CX domain can properly power up.
>
> Reported-by: Rob Clark <robdclark@...il.com>
> Cc: Rajendra Nayak <rnayak@...eaurora.org>
> Signed-off-by: Stephen Boyd <sboyd@...eaurora.org>
> ---
>   drivers/clk/qcom/mmcc-msm8974.c | 10 +++++++++-
>   1 file changed, 9 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/clk/qcom/mmcc-msm8974.c b/drivers/clk/qcom/mmcc-msm8974.c
> index fe8320dc41db..3613db0a73e3 100644
> --- a/drivers/clk/qcom/mmcc-msm8974.c
> +++ b/drivers/clk/qcom/mmcc-msm8974.c
> @@ -2615,6 +2615,7 @@ MODULE_DEVICE_TABLE(of, mmcc_msm8974_match_table);
>   static int mmcc_msm8974_probe(struct platform_device *pdev)
>   {
>   	struct regmap *regmap;
> +	int ret;
>
>   	regmap = qcom_cc_map(pdev, &mmcc_msm8974_desc);
>   	if (IS_ERR(regmap))
> @@ -2623,7 +2624,14 @@ static int mmcc_msm8974_probe(struct platform_device *pdev)
>   	clk_pll_configure_sr_hpm_lp(&mmpll1, regmap, &mmpll1_config, true);
>   	clk_pll_configure_sr_hpm_lp(&mmpll3, regmap, &mmpll3_config, false);
>
> -	return qcom_cc_really_probe(pdev, &mmcc_msm8974_desc, regmap);
> +	ret = qcom_cc_really_probe(pdev, &mmcc_msm8974_desc, regmap);
> +	if (ret)
> +		return ret;
> +
> +	ret = pm_genpd_add_subdomain(&oxili_gdsc.pd, &oxilicx_gdsc.pd);

We'll need pm_genpd_add_subdomain() to be EXPORT_SYMBOL_GPL'ed so
clk-qcom can be built as a module.

It would also be nicer if this parent/child relationship can
somehow be represented in data (struct gdsc) that gets passed to
the gdsc driver which then sets it up, instead of individual
clock drivers doing it.

> +	if (ret)
> +		qcom_cc_remove(pdev);
> +	return ret;
>   }
>
>   static int mmcc_msm8974_remove(struct platform_device *pdev)
>

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