[PATCH v3 1/2] drm/aspeed: Look up syscon by phandle

[Joel Stanley]

This scales better to multiple families of SoC. The lookup by compatible
can be removed in a future change.

The fallback path is for the ast2500 platform only. Other platforms will
be added with the new style, so they won't need fallback paths.

Signed-off-by: Joel Stanley <joel at jms.id.au>
---
v2: Fix fallback path to still find ast2500-scu. Thanks jk for the
review
---
 drivers/gpu/drm/aspeed/aspeed_gfx_drv.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/aspeed/aspeed_gfx_drv.c b/drivers/gpu/drm/aspeed/aspeed_gfx_drv.c
index 457ec04950f7..54a6bda03c0e 100644
--- a/drivers/gpu/drm/aspeed/aspeed_gfx_drv.c
+++ b/drivers/gpu/drm/aspeed/aspeed_gfx_drv.c
@@ -103,6 +103,7 @@ static int aspeed_gfx_load(struct drm_device *drm)
 {
 	struct platform_device *pdev = to_platform_device(drm->dev);
 	struct aspeed_gfx *priv = to_aspeed_gfx(drm);
+	struct device_node *np = pdev->dev.of_node;
 	struct resource *res;
 	int ret;
 
@@ -111,10 +112,13 @@ static int aspeed_gfx_load(struct drm_device *drm)
 	if (IS_ERR(priv->base))
 		return PTR_ERR(priv->base);
 
-	priv->scu = syscon_regmap_lookup_by_compatible("aspeed,ast2500-scu");
+	priv->scu = syscon_regmap_lookup_by_phandle(np, "syscon");
 	if (IS_ERR(priv->scu)) {
-		dev_err(&pdev->dev, "failed to find SCU regmap\n");
-		return PTR_ERR(priv->scu);
+		priv->scu = syscon_regmap_lookup_by_compatible("aspeed,ast2500-scu");
+		if (IS_ERR(priv->scu)) {
+			dev_err(&pdev->dev, "failed to find SCU regmap\n");
+			return PTR_ERR(priv->scu);
+		}
 	}
 
 	ret = of_reserved_mem_device_init(drm->dev);
-- 
2.30.0