iommu/ipmmu-vmsa: Refactor ipmmu_of_xlate()

Refactor ipmmu_of_xlate() to improve readability/scalability.

Signed-off-by: Yoshihiro Shimoda <[email protected]>
Link: https://lore.kernel.org/r/1611838980-4940-2-git-send-email-yoshihiro.shimoda.uh@renesas.com
Signed-off-by: Joerg Roedel <[email protected]>

Author: shimoday

drivers/iommu/ipmmu-vmsa.c

@@ -734,54 +734,41 @@ static int ipmmu_init_platform_device(struct device *dev,
 	return 0;
 }
 
-static const struct soc_device_attribute soc_rcar_gen3[] = {
-	{ .soc_id = "r8a774a1", },
-	{ .soc_id = "r8a774b1", },
-	{ .soc_id = "r8a774c0", },
-	{ .soc_id = "r8a774e1", },
-	{ .soc_id = "r8a7795", },
-	{ .soc_id = "r8a77961", },
-	{ .soc_id = "r8a7796", },
-	{ .soc_id = "r8a77965", },
-	{ .soc_id = "r8a77970", },
-	{ .soc_id = "r8a77990", },
-	{ .soc_id = "r8a77995", },
+static const struct soc_device_attribute soc_needs_opt_in[] = {
+	{ .family = "R-Car Gen3", },
+	{ .family = "RZ/G2", },
 	{ /* sentinel */ }
 };
 
-static const struct soc_device_attribute soc_rcar_gen3_whitelist[] = {
-	{ .soc_id = "r8a774b1", },
-	{ .soc_id = "r8a774c0", },
-	{ .soc_id = "r8a774e1", },
-	{ .soc_id = "r8a7795", .revision = "ES3.*" },
-	{ .soc_id = "r8a77961", },
-	{ .soc_id = "r8a77965", },
-	{ .soc_id = "r8a77990", },
-	{ .soc_id = "r8a77995", },
+static const struct soc_device_attribute soc_denylist[] = {
+	{ .soc_id = "r8a774a1", },
+	{ .soc_id = "r8a7795", .revision = "ES1.*" },
+	{ .soc_id = "r8a7795", .revision = "ES2.*" },
+	{ .soc_id = "r8a7796", },
 	{ /* sentinel */ }
 };
 
-static const char * const rcar_gen3_slave_whitelist[] = {
+static const char * const devices_allowlist[] = {
 };
 
-static bool ipmmu_slave_whitelist(struct device *dev)
+static bool ipmmu_device_is_allowed(struct device *dev)
 {
 	unsigned int i;
 
 	/*
-	 * For R-Car Gen3 use a white list to opt-in slave devices.
+	 * R-Car Gen3 and RZ/G2 use the allow list to opt-in devices.
 	 * For Other SoCs, this returns true anyway.
 	 */
-	if (!soc_device_match(soc_rcar_gen3))
+	if (!soc_device_match(soc_needs_opt_in))
 		return true;
 
-	/* Check whether this R-Car Gen3 can use the IPMMU correctly or not */
-	if (!soc_device_match(soc_rcar_gen3_whitelist))
+	/* Check whether this SoC can use the IPMMU correctly or not */
+	if (soc_device_match(soc_denylist))
 		return false;
 
-	/* Check whether this slave device can work with the IPMMU */
-	for (i = 0; i < ARRAY_SIZE(rcar_gen3_slave_whitelist); i++) {
-		if (!strcmp(dev_name(dev), rcar_gen3_slave_whitelist[i]))
+	/* Check whether this device can work with the IPMMU */
+	for (i = 0; i < ARRAY_SIZE(devices_allowlist); i++) {
+		if (!strcmp(dev_name(dev), devices_allowlist[i]))
 			return true;
 	}
 
@@ -792,7 +779,7 @@ static bool ipmmu_slave_whitelist(struct device *dev)
 static int ipmmu_of_xlate(struct device *dev,
 			  struct of_phandle_args *spec)
 {
-	if (!ipmmu_slave_whitelist(dev))
+	if (!ipmmu_device_is_allowed(dev))
 		return -ENODEV;
 
 	iommu_fwspec_add_ids(dev, spec->args, 1);