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Subject: Re: [PATCH] arm64: tegra: add regulator dependency
To:     Arnd Bergmann <arnd@kernel.org>,
        Thierry Reding <thierry.reding@gmail.com>,
        Jonathan Hunter <jonathanh@nvidia.com>
Cc:     soc@kernel.org, Arnd Bergmann <arnd@arndb.de>,
        Ulf Hansson <ulf.hansson@linaro.org>,
        linux-tegra@vger.kernel.org, linux-kernel@vger.kernel.org
References: <20210721151457.2285669-1-arnd@kernel.org>
From:   Dmitry Osipenko <digetx@gmail.com>
Message-ID: <c9968f90-0633-9467-a3fb-725b92116fe2@gmail.com>
Date:   Wed, 21 Jul 2021 18:29:32 +0300
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21.07.2021 18:14, Arnd Bergmann пишет:
> From: Arnd Bergmann <arnd@arndb.de>
> 
> The two regulator drivers in the drivers/soc/ directory fail to build
> when regulator support is disabled:
> 
> aarch64-linux-ld: drivers/soc/tegra/regulators-tegra20.o: in function `tegra20_regulator_reboot':
> regulators-tegra20.c:(.text.tegra20_regulator_reboot+0x4c): undefined reference to `regulator_sync_voltage_rdev'
> aarch64-linux-ld: regulators-tegra20.c:(.text.tegra20_regulator_reboot+0x58): undefined reference to `regulator_sync_voltage_rdev'
> aarch64-linux-ld: drivers/soc/tegra/regulators-tegra30.o: in function `tegra30_regulator_reboot':
> regulators-tegra30.c:(.text.tegra30_regulator_reboot+0x44): undefined reference to `regulator_sync_voltage_rdev'
> aarch64-linux-ld: regulators-tegra30.c:(.text.tegra30_regulator_reboot+0x50): undefined reference to `regulator_sync_voltage_rdev'
> 
> Add a Kconfig dependency to avoid this configuration.
> 
> Fixes: 496747e7d907 ("soc/tegra: regulators: Add regulators coupler for Tegra20")
> Fixes: 783807436f36 ("soc/tegra: regulators: Add regulators coupler for Tegra30")
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> ---
>  drivers/soc/tegra/Kconfig | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/soc/tegra/Kconfig b/drivers/soc/tegra/Kconfig
> index db49075b1946..c56122be27a9 100644
> --- a/drivers/soc/tegra/Kconfig
> +++ b/drivers/soc/tegra/Kconfig
> @@ -153,8 +153,10 @@ config SOC_TEGRA_POWERGATE_BPMP
>  
>  config SOC_TEGRA20_VOLTAGE_COUPLER
>  	bool "Voltage scaling support for Tegra20 SoCs"
> +	depends on REGULATOR
>  	depends on ARCH_TEGRA_2x_SOC || COMPILE_TEST
>  
>  config SOC_TEGRA30_VOLTAGE_COUPLER
>  	bool "Voltage scaling support for Tegra30 SoCs"
> +	depends on REGULATOR
>  	depends on ARCH_TEGRA_3x_SOC || COMPILE_TEST
> 

Hello Arnd,

Thank you for the patch!

I also sent out the fix [1] about a month ago and was trying to ping
Thierry. Unfortunately there was no reaction so far and now Thierry is
on vacation.

[1]
https://patchwork.ozlabs.org/project/linux-tegra/patch/20210621160739.22448-1-digetx@gmail.com/

It looks like my variant of the fix should be a bit more correct since
it won't build the regulator drivers if both TEGRA=n and REGULATOR=n.

I guess it should be fine if you could take the patch directly, perhaps
Jon could ack the patch for that. Otherwise we could wait for Thierry to
return.