drm/stm: ltdc: add devm_reset_control & platform_get_ressource

Use devm_reset_control_get_exclusive to avoid resource leakage (based
on patch "Convert drivers to explicit reset API" from Philipp Zabel).

Also use platform_get_resource, which is more usual and
consistent with platform_get_irq called later.
Signed-off-by: Fabien Dessenne <fabien.dessenne@st.com>
Signed-off-by: Philippe CORNU <philippe.cornu@st.com>
Reviewed-by: Benjamin Gaignard <benjamin.gaignard@linaro.org>
Cc: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Benjamin Gaignard <benjamin.gaignard@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/1500552357-29487-6-git-send-email-philippe.cornu@st.com

drivers/gpu/drm/stm/ltdc.c

@@ -874,7 +874,7 @@ int ltdc_load(struct drm_device *ddev)
 	struct drm_panel *panel;
 	struct drm_crtc *crtc;
 	struct reset_control *rstc;
-	struct resource res;
+	struct resource *res;
 	int irq, ret, i;
 
 	DRM_DEBUG_DRIVER("\n");
@@ -883,7 +883,7 @@ int ltdc_load(struct drm_device *ddev)
 	if (ret)
 		return ret;
 
-	rstc = of_reset_control_get(np, NULL);
+	rstc = devm_reset_control_get_exclusive(dev, NULL);
 
 	mutex_init(&ldev->err_lock);
 
@@ -898,13 +898,14 @@ int ltdc_load(struct drm_device *ddev)
 		return -ENODEV;
 	}
 
-	if (of_address_to_resource(np, 0, &res)) {
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res) {
 		DRM_ERROR("Unable to get resource\n");
 		ret = -ENODEV;
 		goto err;
 	}
 
-	ldev->regs = devm_ioremap_resource(dev, &res);
+	ldev->regs = devm_ioremap_resource(dev, res);
 	if (IS_ERR(ldev->regs)) {
 		DRM_ERROR("Unable to get ltdc registers\n");
 		ret = PTR_ERR(ldev->regs);