Re: [PATCH 10/10 v6] ARM / shmobile: Support for I/O power domains

Magnus Damm
2011-06-27T04:07:13Z

On Sun, Jun 26, 2011 at 6:31 AM, Rafael J. Wysocki <rjw@sisk.pl> wrote:
> From: Rafael J. Wysocki <rjw@sisk.pl>
>
> Use the generic power domains support introduced by the previous
> patch to implement support for power domains on SH7372.
>
> Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
> Acked-by: Paul Mundt <lethal@linux-sh.org>
> ---

Hi Rafael,

Thanks for your work on this. I've been working on up-porting my A3RV
prototype, and I came across these minor details:

> --- linux-2.6.orig/arch/arm/mach-shmobile/board-mackerel.c
> +++ linux-2.6/arch/arm/mach-shmobile/board-mackerel.c
> @@ -1582,6 +1582,10 @@ static void __init mackerel_init(void)
>
>        platform_add_devices(mackerel_devices, ARRAY_SIZE(mackerel_devices));
>
> +       sh7372_init_pm_domain(SH7372_A4LC);
> +       sh7372_add_device_to_domain(SH7372_A4LC, &lcdc_device);
> +       sh7372_add_device_to_domain(SH7372_A4LC, &hdmi_lcdc_device);
> +
>        hdmi_init_pm_clock();
>        sh7372_pm_init();
>  }
> Index: linux-2.6/arch/arm/mach-shmobile/include/mach/sh7372.h
> =================================> --- linux-2.6.orig/arch/arm/mach-shmobile/include/mach/sh7372.h
> +++ linux-2.6/arch/arm/mach-shmobile/include/mach/sh7372.h
> @@ -12,6 +12,7 @@
>  #define __ASM_SH7372_H__
>
>  #include <linux/sh_clk.h>
> +#include <linux/pm_domain.h>
>
>  /*
>  * Pin Function Controller:
> @@ -470,4 +471,31 @@ extern struct clk sh7372_fsibck_clk;
>  extern struct clk sh7372_fsidiva_clk;
>  extern struct clk sh7372_fsidivb_clk;
>
> +struct platform_device;
> +
> +struct sh7372_pm_domain {
> +       struct generic_pm_domain genpd;
> +       unsigned int bit_shift;
> +};
> +
> +static inline struct sh7372_pm_domain *to_sh7372_pd(struct generic_pm_domain *d)
> +{
> +       return container_of(d, struct sh7372_pm_domain, genpd);
> +}
> +
> +#ifdef CONFIG_PM
> +extern struct sh7372_pm_domain sh7372_a4lc_domain;
> +#define SH7372_A4LC    (&sh7372_a4lc_domain)
> +
> +extern void sh7372_init_pm_domain(struct sh7372_pm_domain *sh7372_pd);
> +extern void sh7372_add_device_to_domain(struct sh7372_pm_domain *sh7372_pd,
> +                                       struct platform_device *pdev);
> +#else
> +#define SH7372_A4LC    NULL
> +
> +static inline void sh7372_init_pm_domain(struct sh7372_pm_domain *sh7372_pd) {}
> +static inline void sh7372_add_device_to_domain(struct sh7372_pm_domain *pd,
> +                                              struct platform_device *pdev) {}
> +#endif /* CONFIG_PM */
> +
>  #endif /* __ASM_SH7372_H__ */

Wouldn't it be easier to simply get rid of SH7372_A4LC? Perhaps you
have some special intention behind your #define, but for me the
following change is working just fine:

--- 0001/arch/arm/mach-shmobile/board-mackerel.c
+++ work/arch/arm/mach-shmobile/board-mackerel.c 2011-06-27
13:04:22.000000000 +0900
@@ -1582,9 +1582,9 @@ static void __init mackerel_init(void)

platform_add_devices(mackerel_devices, ARRAY_SIZE(mackerel_devices));

- sh7372_init_pm_domain(SH7372_A4LC);
- sh7372_add_device_to_domain(SH7372_A4LC, &lcdc_device);
- sh7372_add_device_to_domain(SH7372_A4LC, &hdmi_lcdc_device);
+ sh7372_init_pm_domain(&sh7372_a4lc);
+ sh7372_add_device_to_domain(&sh7372_a4lc, &lcdc_device);
+ sh7372_add_device_to_domain(&sh7372_a4lc, &hdmi_lcdc_device);

hdmi_init_pm_clock();
sh7372_pm_init();
--- 0001/arch/arm/mach-shmobile/include/mach/sh7372.h
+++ work/arch/arm/mach-shmobile/include/mach/sh7372.h 2011-06-27
13:03:46.000000000 +0900
@@ -484,15 +484,12 @@ static inline struct sh7372_pm_domain *t
}

#ifdef CONFIG_PM
-extern struct sh7372_pm_domain sh7372_a4lc_domain;
-#define SH7372_A4LC (&sh7372_a4lc_domain)
+extern struct sh7372_pm_domain sh7372_a4lc;

extern void sh7372_init_pm_domain(struct sh7372_pm_domain *sh7372_pd);
extern void sh7372_add_device_to_domain(struct sh7372_pm_domain *sh7372_pd,
struct platform_device *pdev);
#else
-#define SH7372_A4LC NULL
-
static inline void sh7372_init_pm_domain(struct sh7372_pm_domain *sh7372_pd) {}
static inline void sh7372_add_device_to_domain(struct sh7372_pm_domain *pd,
struct platform_device *pdev) {}
--- 0001/arch/arm/mach-shmobile/pm-sh7372.c
+++ work/arch/arm/mach-shmobile/pm-sh7372.c 2011-06-27 13:04:02.000000000 +0900
@@ -115,7 +115,7 @@ void sh7372_add_device_to_domain(struct
pm_genpd_add_device(&sh7372_pd->genpd, dev);
}

-struct sh7372_pm_domain sh7372_a4lc_domain = {
+struct sh7372_pm_domain sh7372_a4lc = {
.bit_shift = 1,
};

Also, one more thing:

> --- linux-2.6.orig/arch/arm/mach-shmobile/Makefile
> +++ linux-2.6/arch/arm/mach-shmobile/Makefile
> @@ -42,6 +42,10 @@ obj-$(CONFIG_MACH_AP4EVB)    += board-ap4ev
>  obj-$(CONFIG_MACH_AG5EVM)      += board-ag5evm.o
>  obj-$(CONFIG_MACH_MACKEREL)    += board-mackerel.o
>
> +# PM objects
> +pm-$(CONFIG_ARCH_SH7372)       += pm-sh7372.o
> +
>  # Framework support
>  obj-$(CONFIG_SMP)              += $(smp-y)
>  obj-$(CONFIG_GENERIC_GPIO)     += $(pfc-y)
> +obj-$(CONFIG_PM)               += $(pm-y)

I don't think this hunk is needed. It must be a left over from some
older version of the patch when pm-sh7372.c didn't exist.

Would you like me to submit incremental patches, or do you prefer to
fix up your current patch?

Thanks!

/ magnus