linux-kernel - [RFC PATCH 2/4] pinctrl: renesas: pinctrl-rzg2l: Add validation of GPIO pin in rzg2l_gpio

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Date:   Fri, 30 Jun 2023 13:04:31 +0100
From:   Prabhakar <prabhakar.csengg@...il.com>
To:     Geert Uytterhoeven <geert+renesas@...der.be>,
        Magnus Damm <magnus.damm@...il.com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        linux-renesas-soc@...r.kernel.org, devicetree@...r.kernel.org,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-gpio@...r.kernel.org, Biju Das <biju.das.jz@...renesas.com>,
        Prabhakar <prabhakar.csengg@...il.com>,
        Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: [RFC PATCH 2/4] 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.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
---
 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 a0c2e585e765..2fc1b880db0c 100644
--- a/drivers/pinctrl/renesas/pinctrl-rzg2l.c
+++ b/drivers/pinctrl/renesas/pinctrl-rzg2l.c
@@ -780,12 +780,18 @@ 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];
+	u64 *pin_data = pin->drv_data;
 	u32 port = RZG2L_PIN_ID_TO_PORT(offset);
 	u8 bit = RZG2L_PIN_ID_TO_PIN(offset);
 	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