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>

diff --git a/drivers/gpio/gpio-mcp23s08.c b/drivers/gpio/gpio-mcp23s08.c
index 6589438..0d58440 100644 (file)
--- 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);