gpio: handle also nested irqchips in the chained handler set-up

To unify how we connect cascaded IRQ chips to parent IRQs, if
NULL us passed as handler to the gpiochip_set_chained_irqchip()
function, assume the chips is nested rather than chained, and
we still get the parent set up correctly by way of this function
call.

Alter the drivers for tc3589x and stmpe to use this to set up
their chained handlers as a demonstration of the usage.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

3 files changed, 36 insertions, 21 deletions

diff --git a/drivers/gpio/gpio-stmpe.c b/drivers/gpio/gpio-stmpe.c
index 845025a5724..b0b342787c3 100644
--- a/drivers/gpio/gpio-stmpe.c
+++ b/drivers/gpio/gpio-stmpe.c
@@ -308,6 +308,12 @@ static int stmpe_gpio_probe(struct platform_device *pdev)
 	if (ret)
 		goto out_free;
 
+	ret = gpiochip_add(&stmpe_gpio->chip);
+	if (ret) {
+		dev_err(&pdev->dev, "unable to add gpiochip: %d\n", ret);
+		goto out_disable;
+	}
+
 	if (irq > 0) {
 		ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
 				stmpe_gpio_irq, IRQF_ONESHOT,
@@ -324,14 +330,13 @@ static int stmpe_gpio_probe(struct platform_device *pdev)
 		if (ret) {
 			dev_err(&pdev->dev,
 				"could not connect irqchip to gpiochip\n");
-			return ret;
+			goto out_disable;
 		}
-	}
 
-	ret = gpiochip_add(&stmpe_gpio->chip);
-	if (ret) {
-		dev_err(&pdev->dev, "unable to add gpiochip: %d\n", ret);
-		goto out_disable;
+		gpiochip_set_chained_irqchip(&stmpe_gpio->chip,
+					     &stmpe_gpio_irq_chip,
+					     irq,
+					     NULL);
 	}
 
 	if (pdata && pdata->setup)
@@ -343,6 +348,7 @@ static int stmpe_gpio_probe(struct platform_device *pdev)
 
 out_disable:
 	stmpe_disable(stmpe, STMPE_BLOCK_GPIO);
+	gpiochip_remove(&stmpe_gpio->chip);
 out_free:
 	kfree(stmpe_gpio);
 	return ret;
diff --git a/drivers/gpio/gpio-tc3589x.c b/drivers/gpio/gpio-tc3589x.c
index 7324869c38e..ae0f6466eb0 100644
--- a/drivers/gpio/gpio-tc3589x.c
+++ b/drivers/gpio/gpio-tc3589x.c
@@ -300,6 +300,11 @@ static int tc3589x_gpio_probe(struct platform_device *pdev)
 		return ret;
 	}
 
+	gpiochip_set_chained_irqchip(&tc3589x_gpio->chip,
+				     &tc3589x_gpio_irq_chip,
+				     irq,
+				     NULL);
+
 	if (pdata && pdata->setup)
 		pdata->setup(tc3589x, tc3589x_gpio->chip.base);
 
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 9362b5b817a..6e00c82be14 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -385,13 +385,14 @@ static struct gpio_chip *find_chip_by_name(const char *name)
  */
 
 /**
- * gpiochip_add_chained_irqchip() - adds a chained irqchip to a gpiochip
- * @gpiochip: the gpiochip to add the irqchip to
- * @irqchip: the irqchip to add to the gpiochip
+ * gpiochip_set_chained_irqchip() - sets a chained irqchip to a gpiochip
+ * @gpiochip: the gpiochip to set the irqchip chain to
+ * @irqchip: the irqchip to chain to the gpiochip
  * @parent_irq: the irq number corresponding to the parent IRQ for this
  * chained irqchip
  * @parent_handler: the parent interrupt handler for the accumulated IRQ
- * coming out of the gpiochip
+ * coming out of the gpiochip. If the interrupt is nested rather than
+ * cascaded, pass NULL in this handler argument
  */
 void gpiochip_set_chained_irqchip(struct gpio_chip *gpiochip,
 				  struct irq_chip *irqchip,
@@ -400,23 +401,26 @@ void gpiochip_set_chained_irqchip(struct gpio_chip *gpiochip,
 {
 	unsigned int offset;
 
-	if (gpiochip->can_sleep) {
-		chip_err(gpiochip, "you cannot have chained interrupts on a chip that may sleep\n");
-		return;
-	}
 	if (!gpiochip->irqdomain) {
 		chip_err(gpiochip, "called %s before setting up irqchip\n",
 			 __func__);
 		return;
 	}
 
-	irq_set_chained_handler(parent_irq, parent_handler);
-
-	/*
-	 * The parent irqchip is already using the chip_data for this
-	 * irqchip, so our callbacks simply use the handler_data.
-	 */
-	irq_set_handler_data(parent_irq, gpiochip);
+	if (parent_handler) {
+		if (gpiochip->can_sleep) {
+			chip_err(gpiochip,
+				 "you cannot have chained interrupts on a "
+				 "chip that may sleep\n");
+			return;
+		}
+		irq_set_chained_handler(parent_irq, parent_handler);
+		/*
+		 * The parent irqchip is already using the chip_data for this
+		 * irqchip, so our callbacks simply use the handler_data.
+		 */
+		irq_set_handler_data(parent_irq, gpiochip);
+	}
 
 	/* Set the parent IRQ for all affected IRQs */
 	for (offset = 0; offset < gpiochip->ngpio; offset++)