gpio: pcf857x: Propagate wake-up setting to parent irq controller

The pcf857x GPIO and interrupt controller uses dummy_irq_chip, which
does not implement irq_chip.irq_set_wake() and does not set
IRQCHIP_SKIP_SET_WAKE.

This causes two s2ram issues if wake-up is enabled for the pcf857x GPIO
pins:
  1. During resume from s2ram, the following warning is printed:

     WARNING: CPU: 0 PID: 1046 at kernel/irq/manage.c:537 irq_set_irq_wake+0x9c/0xf8()
     Unbalanced IRQ 113 wake disable

  2. Wake-up through the pcf857x GPIO pins may fail, as the parent
     interrupt controller may be suspended.

Migrate the pcf857x GPIO and interrupt controller from dummy_irq_chip to
its own irq_chip. This irq chip implements irq_chip.irq_set_wake() to
propagate its wake-up setting to the parent interrupt controller.

This fixes wake-up through gpio-keys on sh73a0/kzm9g, where the pcf857x
interrupt is cascaded to irq-renesas-intc-irqpin, and the latter must
not be suspended when wake-up is enabled.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

1 files changed, 34 insertions, 3 deletions

diff --git a/drivers/gpio/gpio-pcf857x.c b/drivers/gpio/gpio-pcf857x.c
index 126c93732101..945f0cda8529 100644
--- a/drivers/gpio/gpio-pcf857x.c
+++ b/drivers/gpio/gpio-pcf857x.c
@@ -204,6 +204,36 @@ static irqreturn_t pcf857x_irq(int irq, void *data)
         return IRQ_HANDLED;
 }
 
+/*
+ * NOP functions
+ */
+static void noop(struct irq_data *data) { }
+
+static unsigned int noop_ret(struct irq_data *data)
+{
+        return 0;
+}
+
+static int pcf857x_irq_set_wake(struct irq_data *data, unsigned int on)
+{
+        struct pcf857x *gpio = irq_data_get_irq_chip_data(data);
+
+        irq_set_irq_wake(gpio->client->irq, on);
+        return 0;
+}
+
+static struct irq_chip pcf857x_irq_chip = {
+        .name           = "pcf857x",
+        .irq_startup    = noop_ret,
+        .irq_shutdown   = noop,
+        .irq_enable     = noop,
+        .irq_disable    = noop,
+        .irq_ack        = noop,
+        .irq_mask       = noop,
+        .irq_unmask     = noop,
+        .irq_set_wake   = pcf857x_irq_set_wake,
+};
+
 /*-------------------------------------------------------------------------*/
 
 static int pcf857x_probe(struct i2c_client *client,
@@ -317,8 +347,9 @@ static int pcf857x_probe(struct i2c_client *client,
 
         /* Enable irqchip if we have an interrupt */
         if (client->irq) {
-                status = gpiochip_irqchip_add(&gpio->chip, &dummy_irq_chip, 0,
-                                              handle_level_irq, IRQ_TYPE_NONE);
+                status = gpiochip_irqchip_add(&gpio->chip, &pcf857x_irq_chip,
+                                              0, handle_level_irq,
+                                              IRQ_TYPE_NONE);
                 if (status) {
                         dev_err(&client->dev, "cannot add irqchip\n");
                         goto fail_irq;
@@ -331,7 +362,7 @@ static int pcf857x_probe(struct i2c_client *client,
                 if (status)
                         goto fail_irq;
 
-                gpiochip_set_chained_irqchip(&gpio->chip, &dummy_irq_chip,
+                gpiochip_set_chained_irqchip(&gpio->chip, &pcf857x_irq_chip,
                                              client->irq, NULL);
         }