of_mmc_spi: add card detect irq support

Signed-off-by: Esben Haabendal <eha@doredevelopment.dk>
Acked-by: Anton Vorontsov <cbouatmailru@gmail.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>

2 files changed, 32 insertions, 3 deletions

diff --git a/Documentation/powerpc/dts-bindings/mmc-spi-slot.txt b/Documentation/powerpc/dts-bindings/mmc-spi-slot.txt
index c39ac2891951..89a0084df2f7 100644
--- a/Documentation/powerpc/dts-bindings/mmc-spi-slot.txt
+++ b/Documentation/powerpc/dts-bindings/mmc-spi-slot.txt
@@ -7,8 +7,13 @@ Required properties:
 - voltage-ranges : two cells are required, first cell specifies minimum
   slot voltage (mV), second cell specifies maximum slot voltage (mV).
   Several ranges could be specified.
-- gpios : (optional) may specify GPIOs in this order: Card-Detect GPIO,
+
+Optional properties:
+- gpios : may specify GPIOs in this order: Card-Detect GPIO,
   Write-Protect GPIO.
+- interrupts : the interrupt of a card detect interrupt.
+- interrupt-parent : the phandle for the interrupt controller that
+  services interrupts for this device.
 
 Example:
 
@@ -20,4 +25,6 @@ Example:
                          &qe_pio_d 15 0>;
                 voltage-ranges = <3300 3300>;
                 spi-max-frequency = <50000000>;
+                interrupts = <42>;
+                interrupt-parent = <&PIC>;
         };
diff --git a/drivers/mmc/host/of_mmc_spi.c b/drivers/mmc/host/of_mmc_spi.c
index 1247e5de9faa..5530def54e5b 100644
--- a/drivers/mmc/host/of_mmc_spi.c
+++ b/drivers/mmc/host/of_mmc_spi.c
@@ -34,6 +34,7 @@ enum {
 struct of_mmc_spi {
         int gpios[NUM_GPIOS];
         bool alow_gpios[NUM_GPIOS];
+        int detect_irq;
         struct mmc_spi_platform_data pdata;
 };
 
@@ -61,6 +62,22 @@ static int of_mmc_spi_get_ro(struct device *dev)
         return of_mmc_spi_read_gpio(dev, WP_GPIO);
 }
 
+static int of_mmc_spi_init(struct device *dev,
+                           irqreturn_t (*irqhandler)(int, void *), void *mmc)
+{
+        struct of_mmc_spi *oms = to_of_mmc_spi(dev);
+
+        return request_threaded_irq(oms->detect_irq, NULL, irqhandler, 0,
+                                    dev_name(dev), mmc);
+}
+
+static void of_mmc_spi_exit(struct device *dev, void *mmc)
+{
+        struct of_mmc_spi *oms = to_of_mmc_spi(dev);
+
+        free_irq(oms->detect_irq, mmc);
+}
+
 struct mmc_spi_platform_data *mmc_spi_get_pdata(struct spi_device *spi)
 {
         struct device *dev = &spi->dev;
@@ -121,8 +138,13 @@ struct mmc_spi_platform_data *mmc_spi_get_pdata(struct spi_device *spi)
         if (gpio_is_valid(oms->gpios[WP_GPIO]))
                 oms->pdata.get_ro = of_mmc_spi_get_ro;
 
-        /* We don't support interrupts yet, let's poll. */
-        oms->pdata.caps |= MMC_CAP_NEEDS_POLL;
+        oms->detect_irq = irq_of_parse_and_map(np, 0);
+        if (oms->detect_irq != NO_IRQ) {
+                oms->pdata.init = of_mmc_spi_init;
+                oms->pdata.exit = of_mmc_spi_exit;
+        } else {
+                oms->pdata.caps |= MMC_CAP_NEEDS_POLL;
+        }
 
         dev->platform_data = &oms->pdata;
         return dev->platform_data;