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From:   Sylvain Lemieux <slemieux.tyco@gmail.com>
Date:   Tue, 6 Aug 2019 16:02:27 -0400
Message-ID: <CA+rxa6p4gD7+6-aRyd4-V4TvkyMiUh9ueMLc6ggBaDC=LG7fQg@mail.gmail.com>
Subject: Re: [PATCH 05/14] gpio: lpc32xx: allow building on non-lpc32xx targets
To:     Arnd Bergmann <arnd@arndb.de>
Cc:     soc@kernel.org,
        "moderated list:ARM PORT" <linux-arm-kernel@lists.infradead.org>,
        Vladimir Zapolskiy <vz@mleia.com>,
        Russell King <linux@armlinux.org.uk>,
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        Linus Walleij <linus.walleij@linaro.org>,
        Bartosz Golaszewski <bgolaszewski@baylibre.com>,
        Jason Cooper <jason@lakedaemon.net>,
        Andrew Lunn <andrew@lunn.ch>,
        Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>,
        "David S. Miller" <davem@davemloft.net>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Alan Stern <stern@rowland.harvard.edu>,
        Guenter Roeck <linux@roeck-us.net>,
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Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Hi Arnd,

On Wed, Jul 31, 2019 at 4:00 PM Arnd Bergmann <arnd@arndb.de> wrote:
>
> The driver uses hardwire MMIO addresses instead of the data
> that is passed in device tree. Change it over to only
> hardcode the register offset values and allow compile-testing.
>
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> ---
>  drivers/gpio/Kconfig        |  8 +++++
>  drivers/gpio/Makefile       |  2 +-
>  drivers/gpio/gpio-lpc32xx.c | 63 ++++++++++++++++++++++++-------------
>  3 files changed, 50 insertions(+), 23 deletions(-)
>
[...]

> diff --git a/drivers/gpio/gpio-lpc32xx.c b/drivers/gpio/gpio-lpc32xx.c
> index 24885b3db3d5..548f7cb69386 100644
> --- a/drivers/gpio/gpio-lpc32xx.c
> +++ b/drivers/gpio/gpio-lpc32xx.c

[...]

> @@ -498,6 +509,10 @@ static int lpc32xx_gpio_probe(struct platform_device *pdev)
>  {
>         int i;
>
> +       gpio_reg_base = devm_platform_ioremap_resource(pdev, 0);
> +       if (gpio_reg_base)
> +               return -ENXIO;

The probe function will always return an error.
Please replace the previous 2 lines with:
    if (IS_ERR(gpio_reg_base))
        return PTR_ERR(gpio_reg_base);

You can add my acked-by and tested-by in the v2 patch.
Acked-by: Sylvain Lemieux <slemieux.tyco@gmail.com>
Tested-by: Sylvain Lemieux <slemieux.tyco@gmail.com>

> +
>         for (i = 0; i < ARRAY_SIZE(lpc32xx_gpiochip); i++) {
>                 if (pdev->dev.of_node) {
>                         lpc32xx_gpiochip[i].chip.of_xlate = lpc32xx_of_xlate;
> @@ -527,3 +542,7 @@ static struct platform_driver lpc32xx_gpio_driver = {
>  };
>
>  module_platform_driver(lpc32xx_gpio_driver);
> +
> +MODULE_AUTHOR("Kevin Wells <kevin.wells@nxp.com>");
> +MODULE_LICENSE("GPL");
> +MODULE_DESCRIPTION("GPIO driver for LPC32xx SoC");
> --
> 2.20.0
>
Sylvain