linux-kernel - [PATCH v2 4/6] pinctrl: renesas: rzg2l: Drop calling rzg2l_gpio

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Message-ID: <20241025114914.714597-5-prabhakar.mahadev-lad.rj@bp.renesas.com>
Date: Fri, 25 Oct 2024 12:49:12 +0100
From: Prabhakar <prabhakar.csengg@...il.com>
To: Geert Uytterhoeven <geert+renesas@...der.be>,
	Magnus Damm <magnus.damm@...il.com>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Linus Walleij <linus.walleij@...aro.org>
Cc: linux-renesas-soc@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-gpio@...r.kernel.org,
	Prabhakar <prabhakar.csengg@...il.com>,
	Biju Das <biju.das.jz@...renesas.com>,
	Fabrizio Castro <fabrizio.castro.jz@...esas.com>,
	Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: [PATCH v2 4/6] pinctrl: renesas: rzg2l: Drop calling rzg2l_gpio_request()

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

Drop calling rzg2l_gpio_request() in rzg2l_gpio_interrupt_input_mode()
this was added to handle special case of bootloader setting
the same gpio pin as function.

When GPIO pin is requested as interrupt through `gpios` DT property
the gpio_request() is called through the code path and when releasing
GPIO pin it goes through the gpio_free() path, so drop calling
gpio_request() in rzg2l_gpio_child_to_parent_hwirq() path and also
drop rzg2l_gpio_free() in rzg2l_gpio_irq_domain_free(). This fixes
case where rzg2l_gpio_free() was being called twice after the GPIO
interrupt pin is freed (after unbinding the module).

When GPIO pin is requested as interrupt through `interrupt` DT property
this doesn't go through gpio_request()/gpio_free() code path.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
---
v1->v2
- No change
---
 drivers/pinctrl/renesas/pinctrl-rzg2l.c | 33 +++----------------------
 1 file changed, 3 insertions(+), 30 deletions(-)

diff --git a/drivers/pinctrl/renesas/pinctrl-rzg2l.c b/drivers/pinctrl/renesas/pinctrl-rzg2l.c
index d8b942fbf537..b9a8bf43a92a 100644
--- a/drivers/pinctrl/renesas/pinctrl-rzg2l.c
+++ b/drivers/pinctrl/renesas/pinctrl-rzg2l.c
@@ -2372,26 +2372,6 @@ static const struct irq_chip rzg2l_gpio_irqchip = {
 	GPIOCHIP_IRQ_RESOURCE_HELPERS,
 };
 
-static int rzg2l_gpio_interrupt_input_mode(struct gpio_chip *chip, unsigned int offset)
-{
-	struct rzg2l_pinctrl *pctrl = gpiochip_get_data(chip);
-	const struct pinctrl_pin_desc *pin_desc = &pctrl->desc.pins[offset];
-	u64 *pin_data = pin_desc->drv_data;
-	u32 off = RZG2L_PIN_CFG_TO_PORT_OFFSET(*pin_data);
-	u8 bit = RZG2L_PIN_ID_TO_PIN(offset);
-	u8 reg8;
-	int ret;
-
-	reg8 = readb(pctrl->base + PMC(off));
-	if (reg8 & BIT(bit)) {
-		ret = rzg2l_gpio_request(chip, offset);
-		if (ret)
-			return ret;
-	}
-
-	return rzg2l_gpio_direction_input(chip, offset);
-}
-
 static int rzg2l_gpio_child_to_parent_hwirq(struct gpio_chip *gc,
 					    unsigned int child,
 					    unsigned int child_type,
@@ -2407,17 +2387,15 @@ static int rzg2l_gpio_child_to_parent_hwirq(struct gpio_chip *gc,
 	if (gpioint < 0)
 		return gpioint;
 
-	ret = rzg2l_gpio_interrupt_input_mode(gc, child);
+	ret = rzg2l_gpio_direction_input(gc, child);
 	if (ret)
 		return ret;
 
 	spin_lock_irqsave(&pctrl->bitmap_lock, flags);
 	irq = bitmap_find_free_region(pctrl->tint_slot, RZG2L_TINT_MAX_INTERRUPT, get_order(1));
 	spin_unlock_irqrestore(&pctrl->bitmap_lock, flags);
-	if (irq < 0) {
-		ret = -ENOSPC;
-		goto err;
-	}
+	if (irq < 0)
+		return -ENOSPC;
 
 	rzg2l_gpio_irq_endisable(pctrl, child, true);
 	pctrl->hwirq[irq] = child;
@@ -2427,10 +2405,6 @@ static int rzg2l_gpio_child_to_parent_hwirq(struct gpio_chip *gc,
 	*parent_type = IRQ_TYPE_LEVEL_HIGH;
 	*parent = RZG2L_PACK_HWIRQ(gpioint, irq);
 	return 0;
-
-err:
-	rzg2l_gpio_free(gc, child);
-	return ret;
 }
 
 static void rzg2l_gpio_irq_restore(struct rzg2l_pinctrl *pctrl)
@@ -2494,7 +2468,6 @@ static void rzg2l_gpio_irq_domain_free(struct irq_domain *domain, unsigned int v
 			for (i = 0; i < RZG2L_TINT_MAX_INTERRUPT; i++) {
 				if (pctrl->hwirq[i] == hwirq) {
 					rzg2l_gpio_irq_endisable(pctrl, hwirq, false);
-					rzg2l_gpio_free(gc, hwirq);
 					spin_lock_irqsave(&pctrl->bitmap_lock, flags);
 					bitmap_release_region(pctrl->tint_slot, i, get_order(1));
 					spin_unlock_irqrestore(&pctrl->bitmap_lock, flags);
-- 
2.43.0