[PATCH v3] pinctrl: renesas: pinctrl-rzg2l: Add validation of GPIO pin in rzg2l_gpio_request()

[PATCH v3] pinctrl: renesas: pinctrl-rzg2l: Add validation of GPIO pin in rzg2l_gpio_request()

[Prabhakar]

From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>

Validate the GPIO pin request in rzg2l_gpio_request() callback using
rzg2l_validate_gpio_pin() function. This stops any accidental usage
of GPIO pins which are not supported by the SoCs.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
Tested-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
---
v2->v3
* Updated pin_data variable to be u32 instead of u64.

v1->v2
* Maintained reverse christmas tree order.
* Included RB/TB tags from Claudiu.
---
 drivers/pinctrl/renesas/pinctrl-rzg2l.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/pinctrl/renesas/pinctrl-rzg2l.c b/drivers/pinctrl/renesas/pinctrl-rzg2l.c
index 37cdfe4b04f9..94984966084d 100644
--- a/drivers/pinctrl/renesas/pinctrl-rzg2l.c
+++ b/drivers/pinctrl/renesas/pinctrl-rzg2l.c
@@ -795,12 +795,18 @@ static const struct pinconf_ops rzg2l_pinctrl_confops = {
 static int rzg2l_gpio_request(struct gpio_chip *chip, unsigned int offset)
 {
 	struct rzg2l_pinctrl *pctrl = gpiochip_get_data(chip);
+	const struct pinctrl_pin_desc *pin = &pctrl->desc.pins[offset];
 	u32 port = RZG2L_PIN_ID_TO_PORT(offset);
 	u8 bit = RZG2L_PIN_ID_TO_PIN(offset);
+	u32 *pin_data = pin->drv_data;
 	unsigned long flags;
 	u8 reg8;
 	int ret;
 
+	ret = rzg2l_validate_gpio_pin(pctrl, *pin_data, port, bit);
+	if (ret)
+		return ret;
+
 	ret = pinctrl_gpio_request(chip->base + offset);
 	if (ret)
 		return ret;
-- 
2.34.1

Re: [PATCH v3] pinctrl: renesas: pinctrl-rzg2l: Add validation of GPIO pin in rzg2l_gpio_request()

[Geert Uytterhoeven]

On Mon, Sep 25, 2023 at 5:46 PM Prabhakar <prabhakar.csengg@gmail.com> wrote:
> From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
>
> Validate the GPIO pin request in rzg2l_gpio_request() callback using
> rzg2l_validate_gpio_pin() function. This stops any accidental usage
> of GPIO pins which are not supported by the SoCs.
>
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> Reviewed-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
> Tested-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
> ---
> v2->v3
> * Updated pin_data variable to be u32 instead of u64.

Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
i.e. will queue in renesas-pinctrl-for-v6.7.

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-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