spi: Add support for SPL_OF_PLATDATA to mxs_gpio.c driver

After this patch the mxs_gpio.c DM/DTS driver can be used at early SPL to
read states of gpio pins (and for example alter the boot flow).

It was necessary to adjust its name to 'fsl_imx_2{38}_gpio' to match
requirements for SPL_OF_PLATDATA usage.

Signed-off-by: Lukasz Majewski <lukma@denx.de>

drivers/gpio/mxs_gpio.c

@@ -131,9 +131,16 @@ int name_to_gpio(const char *name)
 #else /* CONFIG_DM_GPIO */
 #include <dm.h>
 #include <asm/gpio.h>
+#include <dt-structs.h>
 #include <asm/arch/gpio.h>
 #define MXS_MAX_GPIO_PER_BANK		32
 
+#ifdef CONFIG_MX28
+#define dtd_fsl_imx_gpio dtd_fsl_imx28_gpio
+#else /* CONFIG_MX23 */
+#define dtd_fsl_imx_gpio dtd_fsl_imx23_gpio
+#endif
+
 DECLARE_GLOBAL_DATA_PTR;
 /*
  * According to i.MX28 Reference Manual:
@@ -146,6 +153,14 @@ DECLARE_GLOBAL_DATA_PTR;
  * Bank 4: 0-20 -> 21 PINS
  */
 
+struct mxs_gpio_platdata {
+#if CONFIG_IS_ENABLED(OF_PLATDATA)
+	struct dtd_fsl_imx_gpio dtplat;
+#endif
+	unsigned int bank;
+	int gpio_ranges;
+};
+
 struct mxs_gpio_priv {
 	unsigned int bank;
 };
@@ -223,22 +238,19 @@ static const struct dm_gpio_ops gpio_mxs_ops = {
 
 static int mxs_gpio_probe(struct udevice *dev)
 {
+	struct mxs_gpio_platdata *plat = dev_get_platdata(dev);
 	struct mxs_gpio_priv *priv = dev_get_priv(dev);
 	struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
-	struct fdtdec_phandle_args args;
-	int node = dev_of_offset(dev);
 	char name[16], *str;
-	fdt_addr_t addr;
-	int ret;
-
-	addr = devfdt_get_addr(dev);
-	if (addr == FDT_ADDR_T_NONE) {
-		printf("%s: No 'reg' property defined!\n", __func__);
-		return -EINVAL;
-	}
-
-	priv->bank = (unsigned int)addr;
 
+#if CONFIG_IS_ENABLED(OF_PLATDATA)
+	struct dtd_fsl_imx_gpio *dtplat = &plat->dtplat;
+	priv->bank = (unsigned int)dtplat->reg[0];
+	uc_priv->gpio_count = dtplat->gpio_ranges[3];
+#else
+	priv->bank = (unsigned int)plat->bank;
+	uc_priv->gpio_count = plat->gpio_ranges;
+#endif
 	snprintf(name, sizeof(name), "GPIO%d_", priv->bank);
 	str = strdup(name);
 	if (!str)
@@ -246,16 +258,33 @@ static int mxs_gpio_probe(struct udevice *dev)
 
 	uc_priv->bank_name = str;
 
+	debug("%s: %s: %d pins base: 0x%x\n", __func__, uc_priv->bank_name,
+	      uc_priv->gpio_count, priv->bank);
+
+	return 0;
+}
+
+#if CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)
+static int mxs_ofdata_to_platdata(struct udevice *dev)
+{
+	struct mxs_gpio_platdata *plat = dev->platdata;
+	struct fdtdec_phandle_args args;
+	int node = dev_of_offset(dev);
+	int ret;
+
+	plat->bank = devfdt_get_addr(dev);
+	if (plat->bank == FDT_ADDR_T_NONE) {
+		printf("%s: No 'reg' property defined!\n", __func__);
+		return -EINVAL;
+	}
+
 	ret = fdtdec_parse_phandle_with_args(gd->fdt_blob, node, "gpio-ranges",
 					     NULL, 3, 0, &args);
 	if (ret)
 		printf("%s: 'gpio-ranges' not defined - using default!\n",
 		       __func__);
 
-	uc_priv->gpio_count = ret == 0 ? args.args[2] : MXS_MAX_GPIO_PER_BANK;
+	plat->gpio_ranges = ret == 0 ? args.args[2] : MXS_MAX_GPIO_PER_BANK;
-
-	debug("%s: %s: %d pins\n", __func__, uc_priv->bank_name,
-	      uc_priv->gpio_count);
 
 	return 0;
 }
@@ -265,13 +294,22 @@ static const struct udevice_id mxs_gpio_ids[] = {
 	{ .compatible = "fsl,imx28-gpio" },
 	{ }
 };
+#endif
 
 U_BOOT_DRIVER(gpio_mxs) = {
-	.name	= "gpio_mxs",
+#ifdef CONFIG_MX28
+	.name = "fsl_imx28_gpio",
+#else /* CONFIG_MX23 */
+	.name = "fsl_imx23_gpio",
+#endif
 	.id	= UCLASS_GPIO,
 	.ops	= &gpio_mxs_ops,
 	.probe	= mxs_gpio_probe,
 	.priv_auto_alloc_size = sizeof(struct mxs_gpio_priv),
+	.platdata_auto_alloc_size = sizeof(struct mxs_gpio_platdata),
+#if CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)
 	.of_match = mxs_gpio_ids,
+	.ofdata_to_platdata = mxs_ofdata_to_platdata,
+#endif
 };
 #endif /* CONFIG_DM_GPIO */