linux-kernel - [PATCH 2/6] pinctrl: pistachio: Convert to immutable irq

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Message-Id: <20230414-immutable-irqchips-2-v1-2-6b59a5186b00@linaro.org>
Date:   Fri, 14 Apr 2023 16:06:18 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Marc Zyngier <maz@...nel.org>, Viresh Kumar <vireshk@...nel.org>,
        Shiraz Hashim <shiraz.linux.kernel@...il.com>, soc@...nel.org,
        Bjorn Andersson <andersson@...nel.org>,
        Andy Gross <agross@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>
Cc:     linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-arm-msm@...r.kernel.org,
        Linus Walleij <linus.walleij@...aro.org>
Subject: [PATCH 2/6] pinctrl: pistachio: Convert to immutable irq_chip

Convert the driver to immutable irq-chip with a bit of
intuition.

Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
---
 drivers/pinctrl/pinctrl-pistachio.c | 35 +++++++++++++++++++++++++----------
 1 file changed, 25 insertions(+), 10 deletions(-)

diff --git a/drivers/pinctrl/pinctrl-pistachio.c b/drivers/pinctrl/pinctrl-pistachio.c
index 7ca4ecb6eb8d..53408344927a 100644
--- a/drivers/pinctrl/pinctrl-pistachio.c
+++ b/drivers/pinctrl/pinctrl-pistachio.c
@@ -17,6 +17,7 @@
 #include <linux/pinctrl/pinmux.h>
 #include <linux/platform_device.h>
 #include <linux/property.h>
+#include <linux/seq_file.h>
 #include <linux/slab.h>
 #include <linux/spinlock.h>
 
@@ -93,10 +94,10 @@ struct pistachio_pin_group {
 struct pistachio_gpio_bank {
 	struct pistachio_pinctrl *pctl;
 	void __iomem *base;
+	int instance;
 	unsigned int pin_base;
 	unsigned int npins;
 	struct gpio_chip gpio_chip;
-	struct irq_chip irq_chip;
 };
 
 struct pistachio_pinctrl {
@@ -1228,12 +1229,14 @@ static void pistachio_gpio_irq_mask(struct irq_data *data)
 	struct pistachio_gpio_bank *bank = irqd_to_bank(data);
 
 	gpio_mask_writel(bank, GPIO_INTERRUPT_EN, data->hwirq, 0);
+	gpiochip_disable_irq(&bank->gpio_chip, irqd_to_hwirq(data));
 }
 
 static void pistachio_gpio_irq_unmask(struct irq_data *data)
 {
 	struct pistachio_gpio_bank *bank = irqd_to_bank(data);
 
+	gpiochip_enable_irq(&bank->gpio_chip, irqd_to_hwirq(data));
 	gpio_mask_writel(bank, GPIO_INTERRUPT_EN, data->hwirq, 1);
 }
 
@@ -1312,6 +1315,7 @@ static void pistachio_gpio_irq_handler(struct irq_desc *desc)
 
 #define GPIO_BANK(_bank, _pin_base, _npins)				\
 	{								\
+		.instance = (_bank),					\
 		.pin_base = _pin_base,					\
 		.npins = _npins,					\
 		.gpio_chip = {						\
@@ -1326,14 +1330,6 @@ static void pistachio_gpio_irq_handler(struct irq_desc *desc)
 			.base = _pin_base,				\
 			.ngpio = _npins,				\
 		},							\
-		.irq_chip = {						\
-			.name = "GPIO" #_bank,				\
-			.irq_startup = pistachio_gpio_irq_startup,	\
-			.irq_ack = pistachio_gpio_irq_ack,		\
-			.irq_mask = pistachio_gpio_irq_mask,		\
-			.irq_unmask = pistachio_gpio_irq_unmask,	\
-			.irq_set_type = pistachio_gpio_irq_set_type,	\
-		},							\
 	}
 
 static struct pistachio_gpio_bank pistachio_gpio_banks[] = {
@@ -1345,6 +1341,25 @@ static struct pistachio_gpio_bank pistachio_gpio_banks[] = {
 	GPIO_BANK(5, PISTACHIO_PIN_MFIO(80), 10),
 };
 
+static void pistachio_gpio_irq_print_chip(struct irq_data *data,
+					  struct seq_file *p)
+{
+	struct pistachio_gpio_bank *bank = irqd_to_bank(data);
+
+	seq_printf(p, "GPIO%d", bank->instance);
+}
+
+static const struct irq_chip pistachio_gpio_irq_chip = {
+	.irq_startup = pistachio_gpio_irq_startup,
+	.irq_ack = pistachio_gpio_irq_ack,
+	.irq_mask = pistachio_gpio_irq_mask,
+	.irq_unmask = pistachio_gpio_irq_unmask,
+	.irq_set_type = pistachio_gpio_irq_set_type,
+	.irq_print_chip = pistachio_gpio_irq_print_chip,
+	.flags = IRQCHIP_IMMUTABLE,
+	GPIOCHIP_IRQ_RESOURCE_HELPERS,
+};
+
 static int pistachio_gpio_register(struct pistachio_pinctrl *pctl)
 {
 	struct pistachio_gpio_bank *bank;
@@ -1394,7 +1409,7 @@ static int pistachio_gpio_register(struct pistachio_pinctrl *pctl)
 		bank->gpio_chip.fwnode = child;
 
 		girq = &bank->gpio_chip.irq;
-		girq->chip = &bank->irq_chip;
+		gpio_irq_chip_set_chip(girq, &pistachio_gpio_irq_chip);
 		girq->parent_handler = pistachio_gpio_irq_handler;
 		girq->num_parents = 1;
 		girq->parents = devm_kcalloc(pctl->dev, 1,

-- 
2.34.1