linux-kernel - [PATCH 1/2] pinctrl: at91: Make the irqchip immutable

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Message-Id: <20230216-gpio-at91-immutable-v1-1-44f52f148ab9@kernel.org>
Date:   Thu, 16 Feb 2023 15:43:57 +0000
From:   Mark Brown <broonie@...nel.org>
To:     Ludovic Desroches <ludovic.desroches@...rochip.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Claudiu Beznea <claudiu.beznea@...rochip.com>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-gpio@...r.kernel.org,
        linux-kernel@...r.kernel.org, Mark Brown <broonie@...nel.org>
Subject: [PATCH 1/2] pinctrl: at91: Make the irqchip immutable

To help gpiolib not fiddle around with the internals of the irqchip
flag the chip as immutable, adding the calls into the gpiolib core
required to do so.

Signed-off-by: Mark Brown <broonie@...nel.org>
---
 drivers/pinctrl/pinctrl-at91.c | 25 ++++++++++++++++++++++++-
 1 file changed, 24 insertions(+), 1 deletion(-)

diff --git a/drivers/pinctrl/pinctrl-at91.c b/drivers/pinctrl/pinctrl-at91.c
index 1e1813d7c550..8ecf52ec9b9b 100644
--- a/drivers/pinctrl/pinctrl-at91.c
+++ b/drivers/pinctrl/pinctrl-at91.c
@@ -1536,6 +1536,20 @@ static void at91_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
 #define at91_gpio_dbg_show	NULL
 #endif
 
+static int gpio_irq_request_resources(struct irq_data *d)
+{
+	struct at91_gpio_chip *at91_gpio = irq_data_get_irq_chip_data(d);
+
+	return gpiochip_lock_as_irq(&at91_gpio->chip, irqd_to_hwirq(d));
+}
+
+static void gpio_irq_release_resources(struct irq_data *d)
+{
+	struct at91_gpio_chip *at91_gpio = irq_data_get_irq_chip_data(d);
+
+	gpiochip_unlock_as_irq(&at91_gpio->chip, irqd_to_hwirq(d));
+}
+
 /* Several AIC controller irqs are dispatched through this GPIO handler.
  * To use any AT91_PIN_* as an externally triggered IRQ, first call
  * at91_set_gpio_input() then maybe enable its glitch filter.
@@ -1555,6 +1569,9 @@ static void gpio_irq_mask(struct irq_data *d)
 	struct at91_gpio_chip *at91_gpio = irq_data_get_irq_chip_data(d);
 	void __iomem	*pio = at91_gpio->regbase;
 	unsigned	mask = 1 << d->hwirq;
+	unsigned        gpio = irqd_to_hwirq(d);
+
+	gpiochip_disable_irq(&at91_gpio->chip, gpio);
 
 	if (pio)
 		writel_relaxed(mask, pio + PIO_IDR);
@@ -1565,6 +1582,9 @@ static void gpio_irq_unmask(struct irq_data *d)
 	struct at91_gpio_chip *at91_gpio = irq_data_get_irq_chip_data(d);
 	void __iomem	*pio = at91_gpio->regbase;
 	unsigned	mask = 1 << d->hwirq;
+	unsigned        gpio = irqd_to_hwirq(d);
+
+	gpiochip_enable_irq(&at91_gpio->chip, gpio);
 
 	if (pio)
 		writel_relaxed(mask, pio + PIO_IER);
@@ -1731,12 +1751,15 @@ static int at91_gpio_of_irq_setup(struct platform_device *pdev,
 	at91_gpio->pioc_hwirq = irqd_to_hwirq(d);
 
 	gpio_irqchip->name = "GPIO";
+	gpio_irqchip->irq_request_resources = gpio_irq_request_resources;
+	gpio_irqchip->irq_release_resources = gpio_irq_release_resources;
 	gpio_irqchip->irq_ack = gpio_irq_ack;
 	gpio_irqchip->irq_disable = gpio_irq_mask;
 	gpio_irqchip->irq_mask = gpio_irq_mask;
 	gpio_irqchip->irq_unmask = gpio_irq_unmask;
 	gpio_irqchip->irq_set_wake = pm_ptr(gpio_irq_set_wake);
 	gpio_irqchip->irq_set_type = at91_gpio->ops->irq_type;
+	gpio_irqchip->flags = IRQCHIP_IMMUTABLE;
 
 	/* Disable irqs of this PIO controller */
 	writel_relaxed(~0, at91_gpio->regbase + PIO_IDR);
@@ -1747,7 +1770,7 @@ static int at91_gpio_of_irq_setup(struct platform_device *pdev,
 	 * interrupt.
 	 */
 	girq = &at91_gpio->chip.irq;
-	girq->chip = gpio_irqchip;
+	gpio_irq_chip_set_chip(girq, gpio_irqchip);
 	girq->default_type = IRQ_TYPE_NONE;
 	girq->handler = handle_edge_irq;
 

-- 
2.34.1