linux-kernel - Re: [PATCH 5/5] i2c: Enable compile testing for some of drivers

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Date:   Mon, 30 Dec 2019 20:11:03 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Krzysztof Kozlowski <krzk@...nel.org>
Cc:     Vladimir Zapolskiy <vz@...ia.com>,
        Sylvain Lemieux <slemieux.tyco@...il.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Wolfram Sang <wsa@...-dreams.de>,
        Jean Delvare <jdelvare@...e.de>,
        Jarkko Nikula <jarkko.nikula@...ux.intel.com>,
        Max Staudt <max@...as.org>,
        Juergen Fitschen <jfi@...-embedded.de>,
        Elie Morisse <syniurge@...il.com>,
        Linux I2C <linux-i2c@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 5/5] i2c: Enable compile testing for some of drivers

Hi Krzysztof,

On Mon, Dec 30, 2019 at 6:28 PM Krzysztof Kozlowski <krzk@...nel.org> wrote:
> Some of the I2C bus drivers can be compile tested to increase build
> coverage.  This requires also:
> 1. Adding dependencies on COMMON_CLK for BCM2835 and Meson I2C
>    controllers,
> 2. Adding 'if' conditional to 'default y' so they will not get enabled
>    by default on all other architectures,
> 3. Limiting few compile test options to supported architectures (which
>    provide the readsX()/writesX() primitives).
>
> Signed-off-by: Krzysztof Kozlowski <krzk@...nel.org>

Thanks for your patch!

> --- a/drivers/i2c/busses/Kconfig
> +++ b/drivers/i2c/busses/Kconfig
> @@ -367,7 +367,7 @@ comment "I2C system bus drivers (mostly embedded / system-on-chip)"
>
>  config I2C_ALTERA
>         tristate "Altera Soft IP I2C"
> -       depends on (ARCH_SOCFPGA || NIOS2) && OF
> +       depends on (ARCH_SOCFPGA || NIOS2 || COMPILE_TEST) && OF

Might be easier to read and maintain by splitting in "hard" and "useful"
dependencies:

    depends on OF
    depends on ARCH_SOCFPGA || NIOS2 || COMPILE_TEST

> @@ -611,8 +612,8 @@ config I2C_EMEV2
>
>  config I2C_EXYNOS5
>         tristate "Exynos5 high-speed I2C driver"
> -       depends on ARCH_EXYNOS && OF
> -       default y
> +       depends on (ARCH_EXYNOS && OF) || COMPILE_TEST

This means it is only useful on DT-based Exynos platforms, but compiles
everywhere?

Do you still have support for non-DT Exynos platforms?
ARCH_EXYNOS depends on ARCH_MULTI_V7?
(and its help text mentions Exynos 4/5 only, no 3?)

> @@ -1055,15 +1057,15 @@ config I2C_SYNQUACER
>
>  config I2C_TEGRA
>         tristate "NVIDIA Tegra internal I2C controller"
> -       depends on ARCH_TEGRA
> +       depends on ARCH_TEGRA || (COMPILE_TEST && (ARC || ARM || ARM64 || M68K || RISCV || SUPERH || SPARC))

Perhaps

    depends on ARCH_TEGRA || COMPILE_TEST
    depends on ARC || ARM || ARM64 || M68K || RISCV || SUPERH || SPARC
# needs <foo>

to remember which <foo> feature is needed?

> @@ -1403,8 +1405,8 @@ config I2C_OPAL
>
>  config I2C_ZX2967
>         tristate "ZTE ZX2967 I2C support"
> -       depends on ARCH_ZX
> -       default y
> +       depends on ARCH_ZX || (COMPILE_TEST && (ARC || ARM || ARM64 || M68K || RISCV || SUPERH || SPARC))

Same here/

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds