linux-kernel - [PATCH v2 11/16] gpio: mlxbf2: Convert to immutable irq

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Message-Id: <20230215-immutable-chips-v2-11-d6b0e3f2d991@linaro.org>
Date:   Tue, 07 Mar 2023 14:04:53 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Mun Yew Tham <mun.yew.tham@...el.com>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        Joel Stanley <joel@....id.au>,
        Andrew Jeffery <andrew@...id.au>, Alban Bedel <albeu@...e.fr>,
        Orson Zhai <orsonzhai@...il.com>,
        Baolin Wang <baolin.wang@...ux.alibaba.com>,
        Chunyan Zhang <zhang.lyra@...il.com>,
        Jay Fang <f.fangjian@...wei.com>,
        Daniel Palmer <daniel@...ngy.jp>,
        Romain Perier <romain.perier@...il.com>,
        Santosh Shilimkar <ssantosh@...nel.org>,
        Kevin Hilman <khilman@...nel.org>,
        William Breathitt Gray <william.gray@...aro.org>
Cc:     linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-aspeed@...ts.ozlabs.org, linux-omap@...r.kernel.org,
        Linus Walleij <linus.walleij@...aro.org>,
        Marc Zyngier <maz@...nel.org>
Subject: [PATCH v2 11/16] gpio: mlxbf2: Convert to immutable irq_chip

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

Cc: Marc Zyngier <maz@...nel.org>
Acked-by: Marc Zyngier <maz@...nel.org>
Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
---
 drivers/gpio/gpio-mlxbf2.c | 32 +++++++++++++++++++++++++-------
 1 file changed, 25 insertions(+), 7 deletions(-)

diff --git a/drivers/gpio/gpio-mlxbf2.c b/drivers/gpio/gpio-mlxbf2.c
index 77a41151c921..6abe01bc39c3 100644
--- a/drivers/gpio/gpio-mlxbf2.c
+++ b/drivers/gpio/gpio-mlxbf2.c
@@ -17,6 +17,7 @@
 #include <linux/platform_device.h>
 #include <linux/pm.h>
 #include <linux/resource.h>
+#include <linux/seq_file.h>
 #include <linux/spinlock.h>
 #include <linux/types.h>
 
@@ -65,10 +66,10 @@ struct mlxbf2_gpio_context_save_regs {
 /* BlueField-2 gpio block context structure. */
 struct mlxbf2_gpio_context {
 	struct gpio_chip gc;
-	struct irq_chip irq_chip;
 
 	/* YU GPIO blocks address */
 	void __iomem *gpio_io;
+	struct device *dev;
 
 	struct mlxbf2_gpio_context_save_regs *csave_regs;
 };
@@ -237,6 +238,7 @@ static void mlxbf2_gpio_irq_enable(struct irq_data *irqd)
 	unsigned long flags;
 	u32 val;
 
+	gpiochip_enable_irq(gc, irqd_to_hwirq(irqd));
 	raw_spin_lock_irqsave(&gs->gc.bgpio_lock, flags);
 	val = readl(gs->gpio_io + YU_GPIO_CAUSE_OR_CLRCAUSE);
 	val |= BIT(offset);
@@ -261,6 +263,7 @@ static void mlxbf2_gpio_irq_disable(struct irq_data *irqd)
 	val &= ~BIT(offset);
 	writel(val, gs->gpio_io + YU_GPIO_CAUSE_OR_EVTEN0);
 	raw_spin_unlock_irqrestore(&gs->gc.bgpio_lock, flags);
+	gpiochip_disable_irq(gc, irqd_to_hwirq(irqd));
 }
 
 static irqreturn_t mlxbf2_gpio_irq_handler(int irq, void *ptr)
@@ -322,6 +325,24 @@ mlxbf2_gpio_irq_set_type(struct irq_data *irqd, unsigned int type)
 	return 0;
 }
 
+static void mlxbf2_gpio_irq_print_chip(struct irq_data *irqd,
+				       struct seq_file *p)
+{
+	struct gpio_chip *gc = irq_data_get_irq_chip_data(irqd);
+	struct mlxbf2_gpio_context *gs = gpiochip_get_data(gc);
+
+	seq_printf(p, dev_name(gs->dev));
+}
+
+static const struct irq_chip mlxbf2_gpio_irq_chip = {
+	.irq_set_type = mlxbf2_gpio_irq_set_type,
+	.irq_enable = mlxbf2_gpio_irq_enable,
+	.irq_disable = mlxbf2_gpio_irq_disable,
+	.irq_print_chip = mlxbf2_gpio_irq_print_chip,
+	.flags = IRQCHIP_IMMUTABLE,
+	GPIOCHIP_IRQ_RESOURCE_HELPERS,
+};
+
 /* BlueField-2 GPIO driver initialization routine. */
 static int
 mlxbf2_gpio_probe(struct platform_device *pdev)
@@ -340,6 +361,8 @@ mlxbf2_gpio_probe(struct platform_device *pdev)
 	if (!gs)
 		return -ENOMEM;
 
+	gs->dev = dev;
+
 	/* YU GPIO block address */
 	gs->gpio_io = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(gs->gpio_io))
@@ -376,13 +399,8 @@ mlxbf2_gpio_probe(struct platform_device *pdev)
 
 	irq = platform_get_irq(pdev, 0);
 	if (irq >= 0) {
-		gs->irq_chip.name = name;
-		gs->irq_chip.irq_set_type = mlxbf2_gpio_irq_set_type;
-		gs->irq_chip.irq_enable = mlxbf2_gpio_irq_enable;
-		gs->irq_chip.irq_disable = mlxbf2_gpio_irq_disable;
-
 		girq = &gs->gc.irq;
-		girq->chip = &gs->irq_chip;
+		gpio_irq_chip_set_chip(girq, &mlxbf2_gpio_irq_chip);
 		girq->handler = handle_simple_irq;
 		girq->default_type = IRQ_TYPE_NONE;
 		/* This will let us handle the parent IRQ in the driver */

-- 
2.34.1