Merge branch 'sh_eth-fallback-compat-strings'

Simon Horman says:

====================
net: sh_eth: add R-Car Gen[12] fallback compatibility strings

Add fallback compatibility strings for R-Car Gen 1 and 2.

In the case of Renesas R-Car hardware we know that there are generations of
SoCs, f.e. Gen 1 and 2. But beyond that its not clear what the relationship
between IP blocks might be. For example, I believe that r8a7790 is older
than r8a7791 but that doesn't imply that the latter is a descendant of the
former or vice versa.

We can, however, by examining the documentation and behaviour of the
hardware at run-time observe that the current driver implementation appears
to be compatible with the IP blocks on SoCs within a given generation.

For the above reasons and convenience when enabling new SoCs a
per-generation fallback compatibility string scheme is being adopted for
drivers for Renesas SoCs.

Changes since v1:
* Correct typos in changelogs
* Consistently use tabs for indentation in bindings document
* Enhance readability of description of bindings usage
====================

Signed-off-by: David S. Miller <[email protected]>

Author: davem330

Documentation/devicetree/bindings/net/sh_eth.txt

@@ -4,7 +4,8 @@ This file provides information on what the device node for the SH EtherMAC
 interface contains.
 
 Required properties:
-- compatible: "renesas,gether-r8a7740" if the device is a part of R8A7740 SoC.
+- compatible: Must contain one or more of the following:
+	      "renesas,gether-r8a7740" if the device is a part of R8A7740 SoC.
 	      "renesas,ether-r8a7743"  if the device is a part of R8A7743 SoC.
 	      "renesas,ether-r8a7745"  if the device is a part of R8A7745 SoC.
 	      "renesas,ether-r8a7778"  if the device is a part of R8A7778 SoC.
@@ -14,6 +15,14 @@ Required properties:
 	      "renesas,ether-r8a7793"  if the device is a part of R8A7793 SoC.
 	      "renesas,ether-r8a7794"  if the device is a part of R8A7794 SoC.
 	      "renesas,ether-r7s72100" if the device is a part of R7S72100 SoC.
+	      "renesas,rcar-gen1-ether" for a generic R-Car Gen1 device.
+	      "renesas,rcar-gen2-ether" for a generic R-Car Gen2 or RZ/G1
+	                                device.
+
+	      When compatible with the generic version, nodes must list
+	      the SoC-specific version corresponding to the platform
+	      first followed by the generic version.
+
 - reg: offset and length of (1) the E-DMAC/feLic register block (required),
        (2) the TSU register block (optional).
 - interrupts: interrupt specifier for the sole interrupt.
@@ -36,7 +45,8 @@ Optional properties:
 Example (Lager board):
 
 	ethernet@ee700000 {
-		compatible = "renesas,ether-r8a7790";
+		compatible = "renesas,ether-r8a7790",
+		             "renesas,rcar-gen2-ether";
 		reg = <0 0xee700000 0 0x400>;
 		interrupt-parent = <&gic>;
 		interrupts = <0 162 IRQ_TYPE_LEVEL_HIGH>;

drivers/net/ethernet/renesas/sh_eth.c

@@ -594,7 +594,7 @@ static struct sh_eth_cpu_data r8a7740_data = {
 };
 
 /* There is CPU dependent code */
-static void sh_eth_set_rate_r8a777x(struct net_device *ndev)
+static void sh_eth_set_rate_rcar(struct net_device *ndev)
 {
 	struct sh_eth_private *mdp = netdev_priv(ndev);
 
@@ -608,10 +608,10 @@ static void sh_eth_set_rate_r8a777x(struct net_device *ndev)
 	}
 }
 
-/* R8A7778/9 */
-static struct sh_eth_cpu_data r8a777x_data = {
+/* R-Car Gen1 */
+static struct sh_eth_cpu_data rcar_gen1_data = {
 	.set_duplex	= sh_eth_set_duplex,
-	.set_rate	= sh_eth_set_rate_r8a777x,
+	.set_rate	= sh_eth_set_rate_rcar,
 
 	.register_type	= SH_ETH_REG_FAST_RCAR,
 
@@ -635,10 +635,10 @@ static struct sh_eth_cpu_data r8a777x_data = {
 	.hw_swap	= 1,
 };
 
-/* R8A7790/1 */
-static struct sh_eth_cpu_data r8a779x_data = {
+/* R-Car Gen2 and RZ/G1 */
+static struct sh_eth_cpu_data rcar_gen2_data = {
 	.set_duplex	= sh_eth_set_duplex,
-	.set_rate	= sh_eth_set_rate_r8a777x,
+	.set_rate	= sh_eth_set_rate_rcar,
 
 	.register_type	= SH_ETH_REG_FAST_RCAR,
 
@@ -3086,15 +3086,17 @@ static struct sh_eth_plat_data *sh_eth_parse_dt(struct device *dev)
 
 static const struct of_device_id sh_eth_match_table[] = {
 	{ .compatible = "renesas,gether-r8a7740", .data = &r8a7740_data },
-	{ .compatible = "renesas,ether-r8a7743", .data = &r8a779x_data },
-	{ .compatible = "renesas,ether-r8a7745", .data = &r8a779x_data },
-	{ .compatible = "renesas,ether-r8a7778", .data = &r8a777x_data },
-	{ .compatible = "renesas,ether-r8a7779", .data = &r8a777x_data },
-	{ .compatible = "renesas,ether-r8a7790", .data = &r8a779x_data },
-	{ .compatible = "renesas,ether-r8a7791", .data = &r8a779x_data },
-	{ .compatible = "renesas,ether-r8a7793", .data = &r8a779x_data },
-	{ .compatible = "renesas,ether-r8a7794", .data = &r8a779x_data },
+	{ .compatible = "renesas,ether-r8a7743", .data = &rcar_gen2_data },
+	{ .compatible = "renesas,ether-r8a7745", .data = &rcar_gen2_data },
+	{ .compatible = "renesas,ether-r8a7778", .data = &rcar_gen1_data },
+	{ .compatible = "renesas,ether-r8a7779", .data = &rcar_gen1_data },
+	{ .compatible = "renesas,ether-r8a7790", .data = &rcar_gen2_data },
+	{ .compatible = "renesas,ether-r8a7791", .data = &rcar_gen2_data },
+	{ .compatible = "renesas,ether-r8a7793", .data = &rcar_gen2_data },
+	{ .compatible = "renesas,ether-r8a7794", .data = &rcar_gen2_data },
 	{ .compatible = "renesas,ether-r7s72100", .data = &r7s72100_data },
+	{ .compatible = "renesas,rcar-gen1-ether", .data = &rcar_gen1_data },
+	{ .compatible = "renesas,rcar-gen2-ether", .data = &rcar_gen2_data },
 	{ }
 };
 MODULE_DEVICE_TABLE(of, sh_eth_match_table);