gpio: bcm2835: add device tree support

This patch adds device tree support for the bcm2835 GPIO driver.

Signed-off-by: Fabian Vogt <fvogt@suse.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

diff --git a/doc/device-tree-bindings/gpio/bcm2835-gpio.txt b/doc/device-tree-bindings/gpio/bcm2835-gpio.txt
new file mode 100644 (file)
index 0000000..21e0610
--- /dev/null
+++ b/doc/device-tree-bindings/gpio/bcm2835-gpio.txt
@@ -0,0 +1,5 @@
+* Broadcom BCM283x GPIO controller
+
+Required properties:
+- compatible: must be "brcm,bcm2835-gpio"
+- reg: exactly one register range with length 0xb4

diff --git a/drivers/gpio/bcm2835_gpio.c b/drivers/gpio/bcm2835_gpio.c
index 8dd7a28..cd5480e 100644 (file)
--- a/drivers/gpio/bcm2835_gpio.c
+++ b/drivers/gpio/bcm2835_gpio.c
@@ -10,6 +10,7 @@
 #include <errno.h>
 #include <asm/gpio.h>
 #include <asm/io.h>
+#include <fdtdec.h>
 
 struct bcm2835_gpios {
        struct bcm2835_gpio_regs *reg;
@@ -118,9 +119,32 @@ static int bcm2835_gpio_probe(struct udevice *dev)
        return 0;
 }
 
+#if CONFIG_IS_ENABLED(OF_CONTROL)
+static const struct udevice_id bcm2835_gpio_id[] = {
+       {.compatible = "brcm,bcm2835-gpio"},
+       {}
+};
+
+static int bcm2835_gpio_ofdata_to_platdata(struct udevice *dev)
+{
+       struct bcm2835_gpio_platdata *plat = dev_get_platdata(dev);
+       fdt_addr_t addr;
+
+       addr = dev_get_addr(dev);
+       if (addr == FDT_ADDR_T_NONE)
+               return -EINVAL;
+
+       plat->base = addr;
+       return 0;
+}
+#endif
+
 U_BOOT_DRIVER(gpio_bcm2835) = {
        .name   = "gpio_bcm2835",
        .id     = UCLASS_GPIO,
+       .of_match = of_match_ptr(bcm2835_gpio_id),
+       .ofdata_to_platdata = of_match_ptr(bcm2835_gpio_ofdata_to_platdata),
+       .platdata_auto_alloc_size = sizeof(struct bcm2835_gpio_platdata),
        .ops    = &gpio_bcm2835_ops,
        .probe  = bcm2835_gpio_probe,
        .flags  = DM_FLAG_PRE_RELOC,