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From: Bjorn Andersson <bjorn.andersson@linaro.org>
To: Stephen Boyd <sboyd@kernel.org>
Cc: Andy Gross <agross@kernel.org>,
	Niklas Cassel <niklas.cassel@linaro.org>,
	linux-arm-msm@vger.kernel.org, amit.kucheria@linaro.org,
	Michael Turquette <mturquette@baylibre.com>,
	linux-clk@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v3 7/7] clk: qcom: apcs-msm8916: use clk_parent_data to specify the parent
Date: Fri, 20 Dec 2019 09:22:06 -0800	[thread overview]
Message-ID: <20191220172206.GB1908628@ripper> (raw)
In-Reply-To: <20191219062339.DC0DE21582@mail.kernel.org>

On Wed 18 Dec 22:23 PST 2019, Stephen Boyd wrote:

> Quoting Niklas Cassel (2019-11-25 05:59:09)
> > diff --git a/drivers/clk/qcom/apcs-msm8916.c b/drivers/clk/qcom/apcs-msm8916.c
> > index 46061b3d230e..bb91644edc00 100644
> > --- a/drivers/clk/qcom/apcs-msm8916.c
> > +++ b/drivers/clk/qcom/apcs-msm8916.c
> > @@ -51,6 +51,19 @@ static int qcom_apcs_msm8916_clk_probe(struct platform_device *pdev)
> >         struct clk_init_data init = { };
> >         int ret = -ENODEV;
> >  
> > +       /*
> > +        * This driver is defined by the devicetree binding
> > +        * Documentation/devicetree/bindings/mailbox/qcom,apcs-kpss-global.txt,
> > +        * however, this driver is registered as a platform device by
> > +        * qcom-apcs-ipc-mailbox.c. Because of this, when this driver
> > +        * uses dev_get_regmap() and devm_clk_get(), it has to send the parent
> > +        * device as argument.
> > +        * When registering with the clock framework, we cannot use this trick,
> > +        * since the clock framework always looks at dev->of_node when it tries
> > +        * to find parent clock names using clk_parent_data.
> > +        */
> > +       dev->of_node = parent->of_node;
> 
> This is odd. The clks could be registered with of_clk_hw_register() but
> then we lose the device provider information. Maybe we should search up
> one level to the parent node and if that has a DT node but the
> clk controller device doesn't we should use that instead?
> 

Yeah, we shouldn't have two struct device with the same of_node in the
system, and your suggestion looks quite reasonable. Do you mind spinning
a patch out of it and we can drop above chunk from Niklas' patch - and
afaict merge all the remaining patches to enable CPR on our first
target!

Thanks,
Bjorn

> ----8<-----
> diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
> index b68e200829f2..c8745c415c04 100644
> --- a/drivers/clk/clk.c
> +++ b/drivers/clk/clk.c
> @@ -3669,7 +3669,7 @@ __clk_register(struct device *dev, struct device_node *np, struct clk_hw *hw)
>  	if (dev && pm_runtime_enabled(dev))
>  		core->rpm_enabled = true;
>  	core->dev = dev;
> -	core->of_node = np;
> +	core->of_node = np ? : dev_of_node(dev->parent);
>  	if (dev && dev->driver)
>  		core->owner = dev->driver->owner;
>  	core->hw = hw;

  reply	other threads:[~2019-12-20 17:22 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-25 13:59 [PATCH v3 0/7] Clock changes to support cpufreq on QCS404 Niklas Cassel
2019-11-25 13:59 ` [PATCH v3 2/7] clk: qcom: gcc: limit GPLL0_AO_OUT operating frequency Niklas Cassel
2019-12-19  6:24   ` Stephen Boyd
2019-11-25 13:59 ` [PATCH v3 3/7] clk: qcom: hfpll: register as clock provider Niklas Cassel
2019-12-19  6:24   ` Stephen Boyd
2019-11-25 13:59 ` [PATCH v3 4/7] clk: qcom: hfpll: CLK_IGNORE_UNUSED Niklas Cassel
2019-12-19  6:25   ` Stephen Boyd
2019-11-25 13:59 ` [PATCH v3 5/7] clk: qcom: hfpll: use clk_parent_data to specify the parent Niklas Cassel
2019-12-19  6:25   ` Stephen Boyd
2019-11-25 13:59 ` [PATCH v3 6/7] clk: qcom: apcs-msm8916: silently error out on EPROBE_DEFER Niklas Cassel
2019-12-19  6:25   ` Stephen Boyd
2019-11-25 13:59 ` [PATCH v3 7/7] clk: qcom: apcs-msm8916: use clk_parent_data to specify the parent Niklas Cassel
2019-12-19  6:23   ` Stephen Boyd
2019-12-20 17:22     ` Bjorn Andersson [this message]
2019-12-20 17:56     ` Niklas Cassel
2019-12-24  2:16       ` Stephen Boyd
2019-12-27  2:26         ` Bjorn Andersson
2019-12-30 18:04           ` Stephen Boyd
2020-01-03  7:47   ` Bjorn Andersson
2019-12-18 12:16 ` [PATCH v3 0/7] Clock changes to support cpufreq on QCS404 Niklas Cassel

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