linux-kernel - Re: [PATCH v3] clk: imx: imx8mp: Add pm

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Message-ID: <CAA+D8AMh4rPuMFsNht9R=+V7BRf4By=r0guJcTSD0AFjz-gxEw@mail.gmail.com>
Date: Thu, 21 Mar 2024 20:40:15 +0800
From: Shengjiu Wang <shengjiu.wang@...il.com>
To: Marc Kleine-Budde <mkl@...gutronix.de>
Cc: Shengjiu Wang <shengjiu.wang@....com>, abelvesa@...nel.org, peng.fan@....com, 
	mturquette@...libre.com, sboyd@...nel.org, shawnguo@...nel.org, 
	s.hauer@...gutronix.de, kernel@...gutronix.de, festevam@...il.com, 
	linux-imx@....com, linux-clk@...r.kernel.org, 
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] clk: imx: imx8mp: Add pm_runtime support for power saving

On Thu, Mar 21, 2024 at 5:04 PM Marc Kleine-Budde <mkl@...gutronix.de> wrote:
>
> On 21.03.2024 16:36:51, Shengjiu Wang wrote:
> > Add pm_runtime support for power saving. In pm runtime suspend
> > state the registers will be reseted, so add registers save
> > in pm runtime suspend and restore them in pm runtime resume.
> >
> > Signed-off-by: Shengjiu Wang <shengjiu.wang@....com>
> > Reviewed-by: Peng Fan <peng.fan@....com>
> > ---
> > changes in v3:
> > - remove REGS_NUM, use the ARRAY_SIZE
> > - merge clk_imx8mp_audiomix_drvdata and clk_hw_onecell_data together.
>
> Look way nicer, but still room for improvement.
>
> > changes in v2:
> > - move pm_runtime_enable before the clk register
> >
> >  drivers/clk/imx/clk-imx8mp-audiomix.c | 157 ++++++++++++++++++++++----
> >  1 file changed, 136 insertions(+), 21 deletions(-)
> >
> > diff --git a/drivers/clk/imx/clk-imx8mp-audiomix.c b/drivers/clk/imx/clk-imx8mp-audiomix.c
> > index 55ed211a5e0b..5ae33bce8ad8 100644
> > --- a/drivers/clk/imx/clk-imx8mp-audiomix.c
> > +++ b/drivers/clk/imx/clk-imx8mp-audiomix.c
> > @@ -7,10 +7,12 @@
> >
> >  #include <linux/clk-provider.h>
> >  #include <linux/device.h>
> > +#include <linux/io.h>
> >  #include <linux/mod_devicetable.h>
> >  #include <linux/module.h>
> >  #include <linux/of.h>
> >  #include <linux/platform_device.h>
> > +#include <linux/pm_runtime.h>
> >
> >  #include <dt-bindings/clock/imx8mp-clock.h>
> >
> > @@ -18,6 +20,7 @@
> >
> >  #define CLKEN0                       0x000
> >  #define CLKEN1                       0x004
> > +#define EARC                 0x200
> >  #define SAI1_MCLK_SEL                0x300
> >  #define SAI2_MCLK_SEL                0x304
> >  #define SAI3_MCLK_SEL                0x308
> > @@ -26,6 +29,11 @@
> >  #define SAI7_MCLK_SEL                0x314
> >  #define PDM_SEL                      0x318
> >  #define SAI_PLL_GNRL_CTL     0x400
> > +#define SAI_PLL_FDIVL_CTL0   0x404
> > +#define SAI_PLL_FDIVL_CTL1   0x408
> > +#define SAI_PLL_SSCG_CTL     0x40C
> > +#define SAI_PLL_MNIT_CTL     0x410
> > +#define IPG_LP_CTRL          0x504
> >
> >  #define SAIn_MCLK1_PARENT(n)                                         \
> >  static const struct clk_parent_data                                  \
> > @@ -182,26 +190,82 @@ static struct clk_imx8mp_audiomix_sel sels[] = {
> >       CLK_SAIn(7)
> >  };
> >
> > +static const u16 audiomix_regs[] = {
> > +     CLKEN0,
> > +     CLKEN1,
> > +     EARC,
> > +     SAI1_MCLK_SEL,
> > +     SAI2_MCLK_SEL,
> > +     SAI3_MCLK_SEL,
> > +     SAI5_MCLK_SEL,
> > +     SAI6_MCLK_SEL,
> > +     SAI7_MCLK_SEL,
> > +     PDM_SEL,
> > +     SAI_PLL_GNRL_CTL,
> > +     SAI_PLL_FDIVL_CTL0,
> > +     SAI_PLL_FDIVL_CTL1,
> > +     SAI_PLL_SSCG_CTL,
> > +     SAI_PLL_MNIT_CTL,
> > +     IPG_LP_CTRL,
> > +};
> > +
> > +struct clk_imx8mp_audiomix_priv {
> > +     void __iomem *base;
> > +     struct clk_hw_onecell_data *clk_hw_data;
> > +     u32 regs_save[ARRAY_SIZE(audiomix_regs)];
>
> Put the "struct clk_hw_onecell_data clk_hw_data" at the end of the
> struct. Then allocating should be easier and you don't need the
> additional pointer.

Ok, will do this change in next version.

Best Regards
Shengjiu Wang
>
> Marc
>
> --
> Pengutronix e.K.                 | Marc Kleine-Budde          |
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