iommu/ipmmu-vmsa: Hook up r8a7796 DT matching code

Support the r8a7796 IPMMU by sharing feature flags between
r8a7795 and r8a7796. Also update IOMMU_OF_DECLARE to hook
up the updated compat string.

[rebased on v4.17]
Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
Signed-off-by: Magnus Damm <damm+renesas@opensource.se>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Simon Horman <horms+renesas@verge.net.au>
Signed-off-by: Joerg Roedel <jroedel@suse.de>

drivers/iommu/ipmmu-vmsa.c

@@ -760,8 +760,9 @@ static bool ipmmu_slave_whitelist(struct device *dev)
 	return false;
 }
 
-static const struct soc_device_attribute soc_r8a7795[] = {
+static const struct soc_device_attribute soc_rcar_gen3[] = {
 	{ .soc_id = "r8a7795", },
+	{ .soc_id = "r8a7796", },
 	{ /* sentinel */ }
 };
 
@@ -769,7 +770,7 @@ static int ipmmu_of_xlate(struct device *dev,
 			  struct of_phandle_args *spec)
 {
 	/* For R-Car Gen3 use a white list to opt-in slave devices */
-	if (soc_device_match(soc_r8a7795) && !ipmmu_slave_whitelist(dev))
+	if (soc_device_match(soc_rcar_gen3) && !ipmmu_slave_whitelist(dev))
 		return -ENODEV;
 
 	iommu_fwspec_add_ids(dev, spec->args, 1);
@@ -923,7 +924,7 @@ static const struct ipmmu_features ipmmu_features_default = {
 	.twobit_imttbcr_sl0 = false,
 };
 
-static const struct ipmmu_features ipmmu_features_r8a7795 = {
+static const struct ipmmu_features ipmmu_features_rcar_gen3 = {
 	.use_ns_alias_offset = false,
 	.has_cache_leaf_nodes = true,
 	.number_of_contexts = 8,
@@ -937,7 +938,10 @@ static const struct of_device_id ipmmu_of_ids[] = {
 		.data = &ipmmu_features_default,
 	}, {
 		.compatible = "renesas,ipmmu-r8a7795",
-		.data = &ipmmu_features_r8a7795,
+		.data = &ipmmu_features_rcar_gen3,
+	}, {
+		.compatible = "renesas,ipmmu-r8a7796",
+		.data = &ipmmu_features_rcar_gen3,
 	}, {
 		/* Terminator */
 	},
@@ -1114,6 +1118,7 @@ module_exit(ipmmu_exit);
 
 IOMMU_OF_DECLARE(ipmmu_vmsa_iommu_of, "renesas,ipmmu-vmsa");
 IOMMU_OF_DECLARE(ipmmu_r8a7795_iommu_of, "renesas,ipmmu-r8a7795");
+IOMMU_OF_DECLARE(ipmmu_r8a7796_iommu_of, "renesas,ipmmu-r8a7796");
 
 MODULE_DESCRIPTION("IOMMU API for Renesas VMSA-compatible IPMMU");
 MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");