gpio: mcp23s08: Add simple IRQ support for SPI devices

Currently this implementation only supports one IRQ for (all) SPI devices
using the same chip select.

Signed-off-by: Alexander Stein <alexander.stein@systec-electronic.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/gpio/gpio-mcp23s08.c b/drivers/gpio/gpio-mcp23s08.c
index 6589438dad57..0d58440eb8da 100644
--- a/drivers/gpio/gpio-mcp23s08.c
+++ b/drivers/gpio/gpio-mcp23s08.c
@@ -935,11 +935,14 @@ static int mcp23s08_probe(struct spi_device *spi)
                 return -ENOMEM;
         spi_set_drvdata(spi, data);
 
+        spi->irq = irq_of_parse_and_map(spi->dev.of_node, 0);
+
         for (addr = 0; addr < ARRAY_SIZE(pdata->chip); addr++) {
                 if (!(spi_present_mask & (1 << addr)))
                         continue;
                 chips--;
                 data->mcp[addr] = &data->chip[chips];
+                data->mcp[addr]->irq = spi->irq;
                 status = mcp23s08_probe_one(data->mcp[addr], &spi->dev, spi,
                                             0x40 | (addr << 1), type, pdata,
                                             addr);
@@ -980,6 +983,8 @@ static int mcp23s08_remove(struct spi_device *spi)
                 if (!data->mcp[addr])
                         continue;
 
+                if (spi->irq && data->mcp[addr]->irq_controller)
+                        mcp23s08_irq_teardown(data->mcp[addr]);
                 gpiochip_remove(&data->mcp[addr]->chip);
         }
         kfree(data);