linux-kernel - [PATCH] gpio/mpc8xxx: change irq handler from chained to normal

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Date:   Wed, 11 Sep 2019 17:45:44 +0800
From:   Hui Song <hui.song_1@....com>
To:     Shawn Guo <shawnguo@...nel.org>, Li Yang <leoyang.li@....com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>
Cc:     linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org,
        Song Hui <hui.song_1@....com>
Subject: [PATCH] gpio/mpc8xxx: change irq handler from chained to normal

From: Song Hui <hui.song_1@....com>

More than one gpio controllers can share one interrupt, change the
driver to request shared irq.

Signed-off-by: Laurentiu Tudor <Laurentiu.Tudor@....com>
Signed-off-by: Alex Marginean <alexandru.marginean@....com>
Signed-off-by: Song Hui <hui.song_1@....com>
---
Changes in v4:
	- convert 'pr_err' to 'dev_err'.
Changes in v3:
	- update the patch description.
Changes in v2:
	- delete the compatible of ls1088a.
 drivers/gpio/gpio-mpc8xxx.c | 22 ++++++++++++++--------
 1 file changed, 14 insertions(+), 8 deletions(-)

diff --git a/drivers/gpio/gpio-mpc8xxx.c b/drivers/gpio/gpio-mpc8xxx.c
index 16a47de..e16591b 100644
--- a/drivers/gpio/gpio-mpc8xxx.c
+++ b/drivers/gpio/gpio-mpc8xxx.c
@@ -22,6 +22,7 @@
 #include <linux/irq.h>
 #include <linux/gpio/driver.h>
 #include <linux/bitops.h>
+#include <linux/interrupt.h>
 
 #define MPC8XXX_GPIO_PINS	32
 
@@ -127,10 +128,9 @@ static int mpc8xxx_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
 		return -ENXIO;
 }
 
-static void mpc8xxx_gpio_irq_cascade(struct irq_desc *desc)
+static irqreturn_t mpc8xxx_gpio_irq_cascade(int irq, void *data)
 {
-	struct mpc8xxx_gpio_chip *mpc8xxx_gc = irq_desc_get_handler_data(desc);
-	struct irq_chip *chip = irq_desc_get_chip(desc);
+	struct mpc8xxx_gpio_chip *mpc8xxx_gc = (struct mpc8xxx_gpio_chip *)data;
 	struct gpio_chip *gc = &mpc8xxx_gc->gc;
 	unsigned int mask;
 
@@ -139,8 +139,8 @@ static void mpc8xxx_gpio_irq_cascade(struct irq_desc *desc)
 	if (mask)
 		generic_handle_irq(irq_linear_revmap(mpc8xxx_gc->irq,
 						     32 - ffs(mask)));
-	if (chip->irq_eoi)
-		chip->irq_eoi(&desc->irq_data);
+
+	return IRQ_HANDLED;
 }
 
 static void mpc8xxx_irq_unmask(struct irq_data *d)
@@ -388,7 +388,7 @@ static int mpc8xxx_probe(struct platform_device *pdev)
 
 	ret = gpiochip_add_data(gc, mpc8xxx_gc);
 	if (ret) {
-		pr_err("%pOF: GPIO chip registration failed with status %d\n",
+		dev_err("%pOF: GPIO chip registration failed with status %d\n",
 		       np, ret);
 		goto err;
 	}
@@ -409,8 +409,14 @@ static int mpc8xxx_probe(struct platform_device *pdev)
 	if (devtype->gpio_dir_in_init)
 		devtype->gpio_dir_in_init(gc);
 
-	irq_set_chained_handler_and_data(mpc8xxx_gc->irqn,
-					 mpc8xxx_gpio_irq_cascade, mpc8xxx_gc);
+	ret = request_irq(mpc8xxx_gc->irqn, mpc8xxx_gpio_irq_cascade,
+		IRQF_NO_THREAD | IRQF_SHARED, "gpio-cascade", mpc8xxx_gc);
+	if (ret) {
+		dev_err("%s: failed to request_irq(%d), ret = %d\n",
+				np->full_name, mpc8xxx_gc->irqn, ret);
+		goto err;
+	}
+
 	return 0;
 err:
 	iounmap(mpc8xxx_gc->regs);
-- 
2.9.5