linux-kernel - Re: [PATCH v6 10/18] clk: imx: add hw API imx8m_anatop_get_clk

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Message-ID: <CABGWkvrdMF-sUsHt4Af+Wn-OUgwbjpOpUq-yzMfOYo334_BTjA@mail.gmail.com>
Date: Tue, 24 Dec 2024 13:18:54 +0100
From: Dario Binacchi <dario.binacchi@...rulasolutions.com>
To: Peng Fan <peng.fan@....nxp.com>
Cc: linux-kernel@...r.kernel.org, linux-amarula@...rulasolutions.com, 
	Abel Vesa <abelvesa@...nel.org>, Fabio Estevam <festevam@...il.com>, 
	Michael Turquette <mturquette@...libre.com>, Peng Fan <peng.fan@....com>, 
	Pengutronix Kernel Team <kernel@...gutronix.de>, Sascha Hauer <s.hauer@...gutronix.de>, 
	Shawn Guo <shawnguo@...nel.org>, Stephen Boyd <sboyd@...nel.org>, imx@...ts.linux.dev, 
	linux-arm-kernel@...ts.infradead.org, linux-clk@...r.kernel.org
Subject: Re: [PATCH v6 10/18] clk: imx: add hw API imx8m_anatop_get_clk_hw

Hi Peng,

On Tue, Dec 24, 2024 at 3:17 AM Peng Fan <peng.fan@....nxp.com> wrote:
>
> On Sun, Dec 22, 2024 at 06:04:25PM +0100, Dario Binacchi wrote:
> >Get the hw of a clock registered by the anatop module. This function is
> >preparatory for future developments.
> >
> >Signed-off-by: Dario Binacchi <dario.binacchi@...rulasolutions.com>
> >
> >---
> >
> >(no changes since v5)
> >
> >Changes in v5:
> >- Consider CONFIG_CLK_IMX8M{M,N,P,Q}_MODULE to fix compilation errors
> >
> >Changes in v4:
> >- New
> >
> > drivers/clk/imx/clk.c | 28 ++++++++++++++++++++++++++++
> > drivers/clk/imx/clk.h |  7 +++++++
> > 2 files changed, 35 insertions(+)
> >
> >diff --git a/drivers/clk/imx/clk.c b/drivers/clk/imx/clk.c
> >index df83bd939492..9a21f233e105 100644
> >--- a/drivers/clk/imx/clk.c
> >+++ b/drivers/clk/imx/clk.c
> >@@ -128,6 +128,34 @@ struct clk_hw *imx_get_clk_hw_by_name(struct device_node *np, const char *name)
> > }
> > EXPORT_SYMBOL_GPL(imx_get_clk_hw_by_name);
> >
> >+#if defined(CONFIG_CLK_IMX8MM) || defined(CONFIG_CLK_IMX8MM_MODULE) || \
> >+      defined(CONFIG_CLK_IMX8MN) || defined(CONFIG_CLK_IMX8MN_MODULE) || \
> >+      defined(CONFIG_CLK_IMX8MP) || defined(CONFIG_CLK_IMX8MP_MODULE) || \
> >+      defined(CONFIG_CLK_IMX8MQ) || defined(CONFIG_CLK_IMX8MQ_MODULE)
>
> drop the guarding macros, then this could be reused by i.MX9.
>
> >+struct clk_hw *imx8m_anatop_get_clk_hw(int id)
>
> how about change to
> struct clk_hw *imx_anatop_get_clk_hw(int id, struct device_node *np)?

I designed this function so that the caller, i.e., the CCM driver,
would no longer need to
reference the anatop compatible in any way, but I agree with you that
it would be better
 to add the np parameter. Do you think it would then make sense to add
a phandle to the
 anatop node in the clk node?

clk: clock-controller@...80000 {
    compatible = "fsl,imx8mn-ccm";
    ...
    fsl,anatop = <&anatop>
}

So that we can call
anatop_np = of_parse_phandle(np, "fsl,anatop", 0);
instead of
anatop_np = of_find_compatible_node(NULL, NULL, "fsl,imx8mn-anatop");
This would require an additional patch to
Documentation/devicetree/bindings/clock/imx8m-clock.yaml,
but it would make the CCM driver code more generic.

What do you think? I’m waiting for your response before sending version 7.

Thanks and regards,
Dario





>
> >+{
> >+#if defined(CONFIG_CLK_IMX8MQ) || defined(CONFIG_CLK_IMX8MQ_MODULE)
> >+      const char *compatible = "fsl,imx8mq-anatop";
> >+#else
> >+      const char *compatible = "fsl,imx8mm-anatop";
> >+#endif
> >+      struct device_node *np;
> >+      struct of_phandle_args args;
> >+      struct clk_hw *hw;
> >+
> >+      np = of_find_compatible_node(NULL, NULL, compatible);
>
> Then no need to find the compatible for every function call.
>
> >+      args.np = np;
> >+      args.args_count = 1;
> >+      args.args[0] = id;
> >+      of_node_put(np);
> >+
>
> Thanks,
> Peng



-- 

Dario Binacchi

Senior Embedded Linux Developer

dario.binacchi@...rulasolutions.com

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