linux-kernel - [PATCH 2/2] gpio: iproc-gpio: Handle interrupts for multiple instances

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Date:   Thu, 29 Aug 2019 10:22:28 +0530
From:   Srinath Mannam <srinath.mannam@...adcom.com>
To:     Linus Walleij <linus.walleij@...aro.org>,
        Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>
Cc:     bcm-kernel-feedback-list@...adcom.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Rayagonda Kokatanur <rayagonda.kokatanur@...adcom.com>
Subject: [PATCH 2/2] gpio: iproc-gpio: Handle interrupts for multiple instances

From: Rayagonda Kokatanur <rayagonda.kokatanur@...adcom.com>

When multiple instance of iproc-gpio chips are present, a fix up
message[1] is printed during the probe of second and later instances.

This issue is because driver sharing same irq_chip data structure
among multiple instances of driver.

Fix this by allocating irq_chip data structure per instance of
iproc-gpio.

[1] fix up message addressed by this patch
[  7.862208] gpio gpiochip2: (689d0000.gpio): detected irqchip that
   is shared with multiple gpiochips: please fix the driver.

Fixes: 616043d58a89 ("pinctrl: Rename gpio driver from cygnus to iproc")
Signed-off-by: Rayagonda Kokatanur <rayagonda.kokatanur@...adcom.com>
---
 drivers/pinctrl/bcm/pinctrl-iproc-gpio.c | 21 +++++++++++----------
 1 file changed, 11 insertions(+), 10 deletions(-)

diff --git a/drivers/pinctrl/bcm/pinctrl-iproc-gpio.c b/drivers/pinctrl/bcm/pinctrl-iproc-gpio.c
index 20b9864..8729f47 100644
--- a/drivers/pinctrl/bcm/pinctrl-iproc-gpio.c
+++ b/drivers/pinctrl/bcm/pinctrl-iproc-gpio.c
@@ -114,6 +114,7 @@ struct iproc_gpio {
 
 	raw_spinlock_t lock;
 
+	struct irq_chip irqchip;
 	struct gpio_chip gc;
 	unsigned num_banks;
 
@@ -302,14 +303,6 @@ static int iproc_gpio_irq_set_type(struct irq_data *d, unsigned int type)
 	return 0;
 }
 
-static struct irq_chip iproc_gpio_irq_chip = {
-	.name = "bcm-iproc-gpio",
-	.irq_ack = iproc_gpio_irq_ack,
-	.irq_mask = iproc_gpio_irq_mask,
-	.irq_unmask = iproc_gpio_irq_unmask,
-	.irq_set_type = iproc_gpio_irq_set_type,
-};
-
 /*
  * Request the Iproc IOMUX pinmux controller to mux individual pins to GPIO
  */
@@ -875,14 +868,22 @@ static int iproc_gpio_probe(struct platform_device *pdev)
 	/* optional GPIO interrupt support */
 	irq = platform_get_irq(pdev, 0);
 	if (irq) {
-		ret = gpiochip_irqchip_add(gc, &iproc_gpio_irq_chip, 0,
+		chip->irqchip.name = "bcm-iproc-gpio";
+		chip->irqchip.irq_ack = iproc_gpio_irq_ack;
+		chip->irqchip.irq_mask = iproc_gpio_irq_mask;
+		chip->irqchip.irq_unmask = iproc_gpio_irq_unmask;
+		chip->irqchip.irq_set_type = iproc_gpio_irq_set_type;
+		chip->irqchip.irq_enable = iproc_gpio_irq_unmask;
+		chip->irqchip.irq_disable = iproc_gpio_irq_mask;
+
+		ret = gpiochip_irqchip_add(gc, &chip->irqchip, 0,
 					   handle_simple_irq, IRQ_TYPE_NONE);
 		if (ret) {
 			dev_err(dev, "no GPIO irqchip\n");
 			goto err_rm_gpiochip;
 		}
 
-		gpiochip_set_chained_irqchip(gc, &iproc_gpio_irq_chip, irq,
+		gpiochip_set_chained_irqchip(gc, &chip->irqchip, irq,
 					     iproc_gpio_irq_handler);
 	}
 
-- 
2.7.4