linux-kernel - Re: [PATCH] soc: sunxi: select CONFIG

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Date:   Fri, 3 Feb 2023 23:47:45 -0800
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Arnd Bergmann <arnd@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Samuel Holland <samuel@...lland.org>,
        sparclinux <sparclinux@...r.kernel.org>
Cc:     Arnd Bergmann <arnd@...db.de>,
        linux-arm-kernel@...ts.infradead.org, linux-sunxi@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] soc: sunxi: select CONFIG_PM

Hi--

On 1/30/23 05:04, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> Selecting CONFIG_PM_GENERIC_DOMAINS without CONFIG_PM leads to a
> build failure:
> 
> WARNING: unmet direct dependencies detected for PM_GENERIC_DOMAINS
>   Depends on [n]: PM [=n]
>   Selected by [y]:
>   - SUN20I_PPU [=y] && (ARCH_SUNXI [=n] || COMPILE_TEST [=y])
> 
> drivers/base/power/domain_governor.c: In function 'default_suspend_ok':
> drivers/base/power/domain_governor.c:85:24: error: 'struct dev_pm_info' has no member named 'ignore_children'
>    85 |         if (!dev->power.ignore_children)
>       |                        ^
> drivers/base/power/domain.c: In function 'genpd_queue_power_off_work':
> drivers/base/power/domain.c:657:20: error: 'pm_wq' undeclared (first use in this function)
>   657 |         queue_work(pm_wq, &genpd->power_off_work);
>       |                    ^~~~~
> 
> Unfortunately platforms are inconsistent between using 'select PM'
> and 'depends on PM' here. CONFIG_PM is a user-visible symbol, so
> in principle we should be using 'depends on', but on the other hand
> using 'select' here is more common among drivers/soc. Go with the
> majority for now, as this has a smaller risk of introducing circular
> dependencies. We may need to clean this up for consistency later.
> 
> Fixes: 0e30ca5ab0a8 ("soc: sunxi: Add Allwinner D1 PPU driver")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

With this patch (in linux-next-20230203), building on sparc32 with
COMPILE_TEST=y and ARCH_SUNXI not set:

WARNING: unmet direct dependencies detected for PM
  Depends on [n]: SPARC64 [=n]
  Selected by [y]:
  - SUN20I_PPU [=y] && (ARCH_SUNXI || COMPILE_TEST [=y])

WARNING: unmet direct dependencies detected for PM
  Depends on [n]: SPARC64 [=n]
  Selected by [y]:
  - SUN20I_PPU [=y] && (ARCH_SUNXI || COMPILE_TEST [=y])

WARNING: unmet direct dependencies detected for PM_GENERIC_DOMAINS
  Depends on [n]: SPARC64 [=n] && PM [=y]
  Selected by [y]:
  - QCOM_GDSC [=y] && COMMON_CLK [=y] && PM [=y]
  - SUN20I_PPU [=y] && (ARCH_SUNXI || COMPILE_TEST [=y])
  - MESON_GX_PM_DOMAINS [=y] && (ARCH_MESON || COMPILE_TEST [=y]) && PM [=y] && OF [=y]
  - BCM2835_POWER [=y] && (ARCH_BCM2835 || COMPILE_TEST [=y] && OF [=y]) && PM [=y]
  - BCM_PMB [=y] && (ARCH_BCMBCA || COMPILE_TEST [=y] && OF [=y]) && PM [=y]
  - ROCKCHIP_PM_DOMAINS [=y] && (ARCH_ROCKCHIP || COMPILE_TEST [=y]) && PM [=y]
  Selected by [m]:
  - ARM_SCPI_POWER_DOMAIN [=m] && (ARM_SCPI_PROTOCOL [=m] || COMPILE_TEST [=y] && OF [=y]) && PM [=y]
  - MESON_EE_PM_DOMAINS [=m] && (ARCH_MESON || COMPILE_TEST [=y]) && PM [=y] && OF [=y]
  - QCOM_AOSS_QMP [=m] && (ARCH_QCOM || COMPILE_TEST [=y]) && MAILBOX [=y] && COMMON_CLK [=y] && PM [=y]

WARNING: unmet direct dependencies detected for PM_GENERIC_DOMAINS_OF
  Depends on [n]: SPARC64 [=n] && PM_GENERIC_DOMAINS [=y] && OF [=y]
  Selected by [y]:
  - MESON_GX_PM_DOMAINS [=y] && (ARCH_MESON || COMPILE_TEST [=y]) && PM [=y] && OF [=y]
  Selected by [m]:
  - MESON_EE_PM_DOMAINS [=m] && (ARCH_MESON || COMPILE_TEST [=y]) && PM [=y] && OF [=y]

Apparently sparc32 does not support PM (arch/sparc/Kconfig):

if SPARC64
source "kernel/power/Kconfig"
endif

so I think that SUN20I_PPU should also depend on !SPARC32.
Does that make sense?

Thanks.

> ---
>  drivers/soc/sunxi/Kconfig | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/soc/sunxi/Kconfig b/drivers/soc/sunxi/Kconfig
> index 29e9ba2d520d..02d0b338feb3 100644
> --- a/drivers/soc/sunxi/Kconfig
> +++ b/drivers/soc/sunxi/Kconfig
> @@ -23,6 +23,7 @@ config SUNXI_SRAM
>  config SUN20I_PPU
>  	bool "Allwinner D1 PPU power domain driver"
>  	depends on ARCH_SUNXI || COMPILE_TEST
> +	select PM
>  	select PM_GENERIC_DOMAINS
>  	help
>  	  Say y to enable the PPU power domain driver. This saves power

-- 
~Randy