usb: phy: tegra: Read UTMIP parameters from device tree

UTMIP parameters used to be hardcoded into tables in the
PHY driver. This patch reads them from the device tree instead
in accordance with the phy-tegra-usb DT documentation.
Signed-off-by: Mikko Perttunen <mperttunen@nvidia.com>
Reviewed-by: Stephen Warren <swarren@nvidia.com>
Tested-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

drivers/usb/phy/phy-tegra-usb.c

@@ -184,27 +184,6 @@ static const struct tegra_xtal_freq tegra_freq_table[] = {
 	},
 };
 
-static struct tegra_utmip_config utmip_default[] = {
-	[0] = {
-		.hssync_start_delay = 9,
-		.idle_wait_delay = 17,
-		.elastic_limit = 16,
-		.term_range_adj = 6,
-		.xcvr_setup = 9,
-		.xcvr_lsfslew = 1,
-		.xcvr_lsrslew = 1,
-	},
-	[2] = {
-		.hssync_start_delay = 9,
-		.idle_wait_delay = 17,
-		.elastic_limit = 16,
-		.term_range_adj = 6,
-		.xcvr_setup = 9,
-		.xcvr_lsfslew = 2,
-		.xcvr_lsrslew = 2,
-	},
-};
-
 static void set_pts(struct tegra_usb_phy *phy, u8 pts_val)
 {
 	void __iomem *base = phy->regs;
@@ -703,13 +682,6 @@ static int tegra_usb_phy_init(struct tegra_usb_phy *phy)
 	int i;
 	int err;
 
-	if (!phy->is_ulpi_phy) {
-		if (phy->is_legacy_phy)
-			phy->config = &utmip_default[0];
-		else
-			phy->config = &utmip_default[2];
-	}
-
 	phy->pll_u = devm_clk_get(phy->dev, "pll_u");
 	if (IS_ERR(phy->pll_u)) {
 		pr_err("Can't get pll_u clock\n");
@@ -784,6 +756,88 @@ void tegra_ehci_phy_restore_end(struct usb_phy *x)
 }
 EXPORT_SYMBOL_GPL(tegra_ehci_phy_restore_end);
 
+static int read_utmi_param(struct platform_device *pdev, const char *param,
+			   u8 *dest)
+{
+	u32 value;
+	int err = of_property_read_u32(pdev->dev.of_node, param, &value);
+	*dest = (u8)value;
+	if (err < 0)
+		dev_err(&pdev->dev, "Failed to read USB UTMI parameter %s: %d\n",
+			param, err);
+	return err;
+}
+
+static int utmi_phy_probe(struct tegra_usb_phy *tegra_phy,
+			  struct platform_device *pdev)
+{
+	struct resource *res;
+	int err;
+	struct tegra_utmip_config *config;
+
+	tegra_phy->is_ulpi_phy = false;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+	if (!res) {
+		dev_err(&pdev->dev, "Failed to get UTMI Pad regs\n");
+		return  -ENXIO;
+	}
+
+	tegra_phy->pad_regs = devm_ioremap(&pdev->dev, res->start,
+		resource_size(res));
+	if (!tegra_phy->regs) {
+		dev_err(&pdev->dev, "Failed to remap UTMI Pad regs\n");
+		return -ENOMEM;
+	}
+
+	tegra_phy->config = devm_kzalloc(&pdev->dev,
+		sizeof(*tegra_phy->config), GFP_KERNEL);
+	if (!tegra_phy->config) {
+		dev_err(&pdev->dev,
+			"unable to allocate memory for USB UTMIP config\n");
+		return -ENOMEM;
+	}
+
+	config = tegra_phy->config;
+
+	err = read_utmi_param(pdev, "nvidia,hssync-start-delay",
+		&config->hssync_start_delay);
+	if (err < 0)
+		return err;
+
+	err = read_utmi_param(pdev, "nvidia,elastic-limit",
+		&config->elastic_limit);
+	if (err < 0)
+		return err;
+
+	err = read_utmi_param(pdev, "nvidia,idle-wait-delay",
+		&config->idle_wait_delay);
+	if (err < 0)
+		return err;
+
+	err = read_utmi_param(pdev, "nvidia,term-range-adj",
+		&config->term_range_adj);
+	if (err < 0)
+		return err;
+
+	err = read_utmi_param(pdev, "nvidia,xcvr-setup",
+		&config->xcvr_setup);
+	if (err < 0)
+		return err;
+
+	err = read_utmi_param(pdev, "nvidia,xcvr-lsfslew",
+		&config->xcvr_lsfslew);
+	if (err < 0)
+		return err;
+
+	err = read_utmi_param(pdev, "nvidia,xcvr-lsrslew",
+		&config->xcvr_lsrslew);
+	if (err < 0)
+		return err;
+
+	return 0;
+}
+
 static int tegra_usb_phy_probe(struct platform_device *pdev)
 {
 	struct resource *res;
@@ -815,20 +869,9 @@ static int tegra_usb_phy_probe(struct platform_device *pdev)
 
 	err = of_property_match_string(np, "phy_type", "ulpi");
 	if (err < 0) {
-		tegra_phy->is_ulpi_phy = false;
-
-		res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
-		if (!res) {
-			dev_err(&pdev->dev, "Failed to get UTMI Pad regs\n");
-			return  -ENXIO;
-		}
-
-		tegra_phy->pad_regs = devm_ioremap(&pdev->dev, res->start,
-			resource_size(res));
-		if (!tegra_phy->regs) {
-			dev_err(&pdev->dev, "Failed to remap UTMI Pad regs\n");
-			return -ENOMEM;
-		}
+		err = utmi_phy_probe(tegra_phy, pdev);
+		if (err < 0)
+			return err;
 	} else {
 		tegra_phy->is_ulpi_phy = true;
 
@@ -839,6 +882,8 @@ static int tegra_usb_phy_probe(struct platform_device *pdev)
 				tegra_phy->reset_gpio);
 			return tegra_phy->reset_gpio;
 		}
+
+		tegra_phy->config = NULL;
 	}
 
 	err = of_property_match_string(np, "dr_mode", "otg");