[U-Boot] [PATCH] dm: gpio: MPC85XX GPIO platform data support

[Hamish Martin]

Define a platform data structure for the MPC85XX GPIO driver to allow
use of the driver without device tree. Users should define the GPIO
blocks for their platform like this:
  struct mpc85xx_gpio_plat gpio_blocks[] = {
         {
                 .addr = 0x130000,
                 .ngpios = 32,
         },
         {
                 .addr = 0x131000,
                 .ngpios = 32,
         },
  };

  U_BOOT_DEVICES(my_platform_gpios) = {
         { "gpio_mpc85xx", &gpio_blocks[0] },
         { "gpio_mpc85xx", &gpio_blocks[1] },
  };

This is intended to build upon the recent submission of the base
MPC85XX driver from Mario Six. We need to use that new driver
without dts support and this patch gives us that flexibility.
This has been tested on a Freescale T2080 CPU, although only the first
GPIO block.

Signed-off-by: Hamish Martin <hamish.martin at alliedtelesis.co.nz>
Reviewed-by: Mario Six <mario.six at gdsys.cc>
Tested-by: Mario Six <mario.six at gdsys.cc>
---
 arch/powerpc/include/asm/arch-mpc85xx/gpio.h |  6 +++++
 drivers/gpio/mpc85xx_gpio.c                  | 37 ++++++++++++++++++++++------
 2 files changed, 36 insertions(+), 7 deletions(-)

diff --git a/arch/powerpc/include/asm/arch-mpc85xx/gpio.h b/arch/powerpc/include/asm/arch-mpc85xx/gpio.h
index 41b6677bba38..76faa22c8b43 100644
--- a/arch/powerpc/include/asm/arch-mpc85xx/gpio.h
+++ b/arch/powerpc/include/asm/arch-mpc85xx/gpio.h
@@ -18,4 +18,10 @@
 #include <asm/mpc85xx_gpio.h>
 #endif
 
+struct mpc85xx_gpio_plat {
+	ulong addr;
+	unsigned long size;
+	uint ngpios;
+};
+
 #endif
diff --git a/drivers/gpio/mpc85xx_gpio.c b/drivers/gpio/mpc85xx_gpio.c
index 04773e2b31c3..3754a8215c36 100644
--- a/drivers/gpio/mpc85xx_gpio.c
+++ b/drivers/gpio/mpc85xx_gpio.c
@@ -163,23 +163,41 @@ static int mpc85xx_gpio_get_function(struct udevice *dev, unsigned gpio)
 	return dir ? GPIOF_OUTPUT : GPIOF_INPUT;
 }
 
+#if CONFIG_IS_ENABLED(OF_CONTROL)
 static int mpc85xx_gpio_ofdata_to_platdata(struct udevice *dev) {
-	struct mpc85xx_gpio_data *data = dev_get_priv(dev);
+	struct mpc85xx_gpio_plat *plat = dev_get_platdata(dev);
 	fdt_addr_t addr;
 	fdt_size_t size;
 
 	addr = fdtdec_get_addr_size_auto_noparent(gd->fdt_blob, dev->of_offset,
 						  "reg", 0, &size);
 
-	data->addr = addr;
-	data->base = map_sysmem(CONFIG_SYS_IMMR + addr, size);
+	plat->addr = addr;
+	plat->size = size;
+	plat->ngpios = fdtdec_get_int(gd->fdt_blob, dev->of_offset,
+						  "ngpios", 32);
 
-	if (!data->base)
+	return 0;
+}
+#endif
+
+static int mpc85xx_gpio_platdata_to_priv(struct udevice *dev)
+{
+	struct mpc85xx_gpio_data *priv = dev_get_priv(dev);
+	struct mpc85xx_gpio_plat *plat = dev_get_platdata(dev);
+	unsigned long size = plat->size;
+
+	if (size == 0)
+		size = 0x100;
+
+	priv->addr = plat->addr;
+	priv->base = map_sysmem(CONFIG_SYS_IMMR + plat->addr, size);
+
+	if (!priv->base)
 		return -ENOMEM;
 
-	data->gpio_count = fdtdec_get_int(gd->fdt_blob, dev->of_offset,
-					  "ngpios", 32);
-	data->dat_shadow = 0;
+	priv->gpio_count = plat->ngpios;
+	priv->dat_shadow = 0;
 
 	return 0;
 }
@@ -190,6 +208,8 @@ static int mpc85xx_gpio_probe(struct udevice *dev)
 	struct mpc85xx_gpio_data *data = dev_get_priv(dev);
 	char name[32], *str;
 
+	mpc85xx_gpio_platdata_to_priv(dev);
+
 	snprintf(name, sizeof(name), "MPC@%lx_", data->addr);
 	str = strdup(name);
 
@@ -221,8 +241,11 @@ U_BOOT_DRIVER(gpio_mpc85xx) = {
 	.name	= "gpio_mpc85xx",
 	.id	= UCLASS_GPIO,
 	.ops	= &gpio_mpc85xx_ops,
+#if CONFIG_IS_ENABLED(OF_CONTROL)
 	.ofdata_to_platdata = mpc85xx_gpio_ofdata_to_platdata,
+	.platdata_auto_alloc_size = sizeof(struct mpc85xx_gpio_plat),
 	.of_match = mpc85xx_gpio_ids,
+#endif
 	.probe	= mpc85xx_gpio_probe,
 	.priv_auto_alloc_size = sizeof(struct mpc85xx_gpio_data),
 };
-- 
2.8.3