[PATCH v1 1/2] ARM: i.MX8MP: skov: add fallback for unsupported HW

[Oleksij Rempel <o.rempel@pengutronix.de>]

Add fallback support for currently not supported HW. Instead of
completely fail, it is better to use some kind of basic devicetree with
reduced functionality.

Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
---
 arch/arm/boards/skov-imx8mp/board.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/arch/arm/boards/skov-imx8mp/board.c b/arch/arm/boards/skov-imx8mp/board.c
index 5424c3b9ab..a45fe8517f 100644
--- a/arch/arm/boards/skov-imx8mp/board.c
+++ b/arch/arm/boards/skov-imx8mp/board.c
@@ -83,6 +83,12 @@ static const struct board_description imx8mp_variants[] = {
 		.dts_compatible_hdmi = "skov,imx8mp-skov-revb-hdmi",
 		.flags = SKOV_IMX8MP_HAS_HDMI,
 	},
+	/* Keep this entry always on the last place. It will be used
+	 * as fallback variant if not supported variant is detected.
+	 */
+	{
+		.dts_compatible = "skov,imx8mp-skov-basic",
+	},
 };
 
 static int skov_imx8mp_fixup(struct device_node *root, void *data)
@@ -168,13 +174,14 @@ static int skov_imx8mp_init_variant(struct skov_imx8mp_priv *priv)
 	if (ret)
 		return ret;
 
-	priv->variant_id = v;
 
 	if (v >= ARRAY_SIZE(imx8mp_variants)) {
-		dev_err(dev, "Invalid variant %u\n", v);
-		return -EINVAL;
+		dev_warn(dev, "Unsuported variant %u. Fall back to basic variant\n", v);
+		v = ARRAY_SIZE(imx8mp_variants) - 1;
 	}
 
+	priv->variant_id = v;
+
 	variant = &imx8mp_variants[v];
 
 	if (variant->flags & SKOV_IMX8MP_HAS_HDMI) {
-- 
2.39.2