at86rf230: add support for devicetree

This patch adds devicetree support for the at86rf230 driver.

Possible gpios to configure are "reset-gpio" and "sleep-gpio".
Also add support to configure the "irq-type" for the irq polarity
register.

Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ieee802154/at86rf230.c b/drivers/net/ieee802154/at86rf230.c
index 47677e3..e8004ef 100644 (file)
--- a/drivers/net/ieee802154/at86rf230.c
+++ b/drivers/net/ieee802154/at86rf230.c
@@ -31,6 +31,7 @@
 #include <linux/spi/spi.h>
 #include <linux/spi/at86rf230.h>
 #include <linux/skbuff.h>
+#include <linux/of_gpio.h>
 
 #include <net/mac802154.h>
 #include <net/wpan-phy.h>
@@ -1035,6 +1036,40 @@ static int at86rf230_hw_init(struct at86rf230_local *lp)
        return 0;
 }
 
+static struct at86rf230_platform_data *
+at86rf230_get_pdata(struct spi_device *spi)
+{
+       struct at86rf230_platform_data *pdata;
+       const char *irq_type;
+
+       if (!IS_ENABLED(CONFIG_OF) || !spi->dev.of_node)
+               return spi->dev.platform_data;
+
+       pdata = devm_kzalloc(&spi->dev, sizeof(*pdata), GFP_KERNEL);
+       if (!pdata)
+               goto done;
+
+       pdata->rstn = of_get_named_gpio(spi->dev.of_node, "reset-gpio", 0);
+       pdata->slp_tr = of_get_named_gpio(spi->dev.of_node, "sleep-gpio", 0);
+
+       pdata->irq_type = IRQF_TRIGGER_RISING;
+       of_property_read_string(spi->dev.of_node, "irq-type", &irq_type);
+       if (!strcmp(irq_type, "level-high"))
+               pdata->irq_type = IRQF_TRIGGER_HIGH;
+       else if (!strcmp(irq_type, "level-low"))
+               pdata->irq_type = IRQF_TRIGGER_LOW;
+       else if (!strcmp(irq_type, "edge-rising"))
+               pdata->irq_type = IRQF_TRIGGER_RISING;
+       else if (!strcmp(irq_type, "edge-falling"))
+               pdata->irq_type = IRQF_TRIGGER_FALLING;
+       else
+               dev_warn(&spi->dev, "wrong irq-type specified using edge-rising\n");
+
+       spi->dev.platform_data = pdata;
+done:
+       return pdata;
+}
+
 static int at86rf230_probe(struct spi_device *spi)
 {
        struct at86rf230_platform_data *pdata;
@@ -1053,7 +1088,7 @@ static int at86rf230_probe(struct spi_device *spi)
                return -EINVAL;
        }
 
-       pdata = spi->dev.platform_data;
+       pdata = at86rf230_get_pdata(spi);
        if (!pdata) {
                dev_err(&spi->dev, "no platform_data\n");
                return -EINVAL;
@@ -1231,8 +1266,19 @@ static int at86rf230_remove(struct spi_device *spi)
        return 0;
 }
 
+#if IS_ENABLED(CONFIG_OF)
+static struct of_device_id at86rf230_of_match[] = {
+       { .compatible = "atmel,at86rf230", },
+       { .compatible = "atmel,at86rf231", },
+       { .compatible = "atmel,at86rf233", },
+       { .compatible = "atmel,at86rf212", },
+       { },
+};
+#endif
+
 static struct spi_driver at86rf230_driver = {
        .driver = {
+               .of_match_table = of_match_ptr(at86rf230_of_match),
                .name   = "at86rf230",
                .owner  = THIS_MODULE,
        },