linux-kernel - Re: [RFT PATCH] mtd: rawnand: ingenic: move the GPIO quirk to gpiolib-of.c

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Date:   Wed, 27 Sep 2023 13:15:40 +0200
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        Andy Shevchenko <andy@...nel.org>,
        Harvey Hunt <harveyhuntnexus@...il.com>,
        Paul Cercueil <paul@...pouillou.net>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>
Cc:     linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mtd@...ts.infradead.org, linux-mips@...r.kernel.org,
        Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: Re: [RFT PATCH] mtd: rawnand: ingenic: move the GPIO quirk to gpiolib-of.c

On Tue, Sep 26, 2023 at 11:06 AM Bartosz Golaszewski <brgl@...ev.pl> wrote:
>
> From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
>
> We have a special place for OF polarity quirks in gpiolib-of.c. Let's
> move this over there so that it doesn't pollute the driver.
>
> Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
> ---
> This is an alternative to the previous patch that instead of replacing
> one active-low setter with another, just moves the quirk over to
> gpiolib-of.c
>
>  drivers/gpio/gpiolib-of.c                       |  9 +++++++++
>  drivers/mtd/nand/raw/ingenic/ingenic_nand_drv.c | 12 ------------
>  2 files changed, 9 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/gpio/gpiolib-of.c b/drivers/gpio/gpiolib-of.c
> index 5515f32cf19b..58c0bbe9d569 100644
> --- a/drivers/gpio/gpiolib-of.c
> +++ b/drivers/gpio/gpiolib-of.c
> @@ -192,6 +192,15 @@ static void of_gpio_try_fixup_polarity(const struct device_node *np,
>                  */
>                 { "himax,hx8357",       "gpios-reset",  false },
>                 { "himax,hx8369",       "gpios-reset",  false },
> +               /*
> +                * The rb-gpios semantics was undocumented and qi,lb60 (along with
> +                * the ingenic driver) got it wrong. The active state encodes the
> +                * NAND ready state, which is high level. Since there's no signal
> +                * inverter on this board, it should be active-high. Let's fix that
> +                * here for older DTs so we can re-use the generic nand_gpio_waitrdy()
> +                * helper, and be consistent with what other drivers do.
> +                */
> +               { "qi,lb60",            "rb-gpios",     true },
>  #endif
>         };
>         unsigned int i;
> diff --git a/drivers/mtd/nand/raw/ingenic/ingenic_nand_drv.c b/drivers/mtd/nand/raw/ingenic/ingenic_nand_drv.c
> index 6748226b8bd1..c816dc137245 100644
> --- a/drivers/mtd/nand/raw/ingenic/ingenic_nand_drv.c
> +++ b/drivers/mtd/nand/raw/ingenic/ingenic_nand_drv.c
> @@ -380,18 +380,6 @@ static int ingenic_nand_init_chip(struct platform_device *pdev,
>                 return ret;
>         }
>
> -       /*
> -        * The rb-gpios semantics was undocumented and qi,lb60 (along with
> -        * the ingenic driver) got it wrong. The active state encodes the
> -        * NAND ready state, which is high level. Since there's no signal
> -        * inverter on this board, it should be active-high. Let's fix that
> -        * here for older DTs so we can re-use the generic nand_gpio_waitrdy()
> -        * helper, and be consistent with what other drivers do.
> -        */
> -       if (of_machine_is_compatible("qi,lb60") &&
> -           gpiod_is_active_low(nand->busy_gpio))
> -               gpiod_toggle_active_low(nand->busy_gpio);
> -
>         nand->wp_gpio = devm_gpiod_get_optional(dev, "wp", GPIOD_OUT_LOW);
>
>         if (IS_ERR(nand->wp_gpio)) {
> --
> 2.39.2
>

Queued for v6.7.

Bartosz