linux-kernel - [PATCH v3] pinctrl: renesas: pinctrl-rzg2l: Add validation of GPIO pin in rzg2l_gpio

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Message-Id: <20230925154548.27048-1-prabhakar.mahadev-lad.rj@bp.renesas.com>
Date:   Mon, 25 Sep 2023 16:45:48 +0100
From:   Prabhakar <prabhakar.csengg@...il.com>
To:     Geert Uytterhoeven <geert+renesas@...der.be>,
        Linus Walleij <linus.walleij@...aro.org>,
        linux-renesas-soc@...r.kernel.org, linux-gpio@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org,
        Prabhakar <prabhakar.csengg@...il.com>,
        Biju Das <biju.das.jz@...renesas.com>,
        Claudiu Beznea <claudiu.beznea.uj@...renesas.com>,
        Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: [PATCH v3] pinctrl: renesas: pinctrl-rzg2l: Add validation of GPIO pin in rzg2l_gpio_request()

From: Lad Prabhakar <prabhakar.mahadev-lad.rj@...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@...renesas.com>
Reviewed-by: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
Tested-by: Claudiu Beznea <claudiu.beznea.uj@...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