i2c: rcar: Add per-Generation fallback bindings

In the case of Renesas R-Car hardware we know that there are generations of
SoCs, e.g. Gen 2 and Gen 3. But beyond that it's 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.

Also:
* Deprecate renesas,i2c-rcar. It seems poorly named as it is only
  compatible with R-Car Gen 1. It also appears unused in mainline.
* Add some text to describe per-SoC bindings

Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

2 files changed, 24 insertions, 13 deletions

diff --git a/Documentation/devicetree/bindings/i2c/i2c-rcar.txt b/Documentation/devicetree/bindings/i2c/i2c-rcar.txt
index 239632a0d709..2b8bd33dbf8d 100644
--- a/Documentation/devicetree/bindings/i2c/i2c-rcar.txt
+++ b/Documentation/devicetree/bindings/i2c/i2c-rcar.txt
@@ -1,17 +1,25 @@
 I2C for R-Car platforms
 
 Required properties:
-- compatible: Must be one of
-        "renesas,i2c-rcar"
-        "renesas,i2c-r8a7778"
-        "renesas,i2c-r8a7779"
-        "renesas,i2c-r8a7790"
-        "renesas,i2c-r8a7791"
-        "renesas,i2c-r8a7792"
-        "renesas,i2c-r8a7793"
-        "renesas,i2c-r8a7794"
-        "renesas,i2c-r8a7795"
-        "renesas,i2c-r8a7796"
+- compatible:
+        "renesas,i2c-r8a7778" if the device is a part of a R8A7778 SoC.
+        "renesas,i2c-r8a7779" if the device is a part of a R8A7779 SoC.
+        "renesas,i2c-r8a7790" if the device is a part of a R8A7790 SoC.
+        "renesas,i2c-r8a7791" if the device is a part of a R8A7791 SoC.
+        "renesas,i2c-r8a7792" if the device is a part of a R8A7792 SoC.
+        "renesas,i2c-r8a7793" if the device is a part of a R8A7793 SoC.
+        "renesas,i2c-r8a7794" if the device is a part of a R8A7794 SoC.
+        "renesas,i2c-r8a7795" if the device is a part of a R8A7795 SoC.
+        "renesas,i2c-r8a7796" if the device is a part of a R8A7796 SoC.
+        "renesas,rcar-gen1-i2c" for a generic R-Car Gen1 compatible device.
+        "renesas,rcar-gen2-i2c" for a generic R-Car Gen2 compatible device.
+        "renesas,rcar-gen3-i2c" for a generic R-Car Gen3 compatible device.
+        "renesas,i2c-rcar" (deprecated)
+
+        When compatible with the generic version, nodes must list the
+        SoC-specific version corresponding to the platform first followed
+        by the generic version.
+
 - reg: physical base address of the controller and length of memory mapped
   region.
 - interrupts: interrupt specifier.
@@ -33,7 +41,7 @@ Examples :
 i2c0: i2c@e6508000 {
         #address-cells = <1>;
         #size-cells = <0>;
-        compatible = "renesas,i2c-r8a7791";
+        compatible = "renesas,i2c-r8a7791", "renesas,rcar-gen2-i2c";
         reg = <0 0xe6508000 0 0x40>;
         interrupts = <0 287 IRQ_TYPE_LEVEL_HIGH>;
         clocks = <&mstp9_clks R8A7791_CLK_I2C0>;
diff --git a/drivers/i2c/busses/i2c-rcar.c b/drivers/i2c/busses/i2c-rcar.c
index 726615e54f2a..26f2ff22e97e 100644
--- a/drivers/i2c/busses/i2c-rcar.c
+++ b/drivers/i2c/busses/i2c-rcar.c
@@ -793,7 +793,6 @@ static const struct i2c_algorithm rcar_i2c_algo = {
 };
 
 static const struct of_device_id rcar_i2c_dt_ids[] = {
-        { .compatible = "renesas,i2c-rcar", .data = (void *)I2C_RCAR_GEN1 },
         { .compatible = "renesas,i2c-r8a7778", .data = (void *)I2C_RCAR_GEN1 },
         { .compatible = "renesas,i2c-r8a7779", .data = (void *)I2C_RCAR_GEN1 },
         { .compatible = "renesas,i2c-r8a7790", .data = (void *)I2C_RCAR_GEN2 },
@@ -803,6 +802,10 @@ static const struct of_device_id rcar_i2c_dt_ids[] = {
         { .compatible = "renesas,i2c-r8a7794", .data = (void *)I2C_RCAR_GEN2 },
         { .compatible = "renesas,i2c-r8a7795", .data = (void *)I2C_RCAR_GEN3 },
         { .compatible = "renesas,i2c-r8a7796", .data = (void *)I2C_RCAR_GEN3 },
+        { .compatible = "renesas,i2c-rcar", .data = (void *)I2C_RCAR_GEN1 },    /* Deprecated */
+        { .compatible = "renesas,rcar-gen1-i2c", .data = (void *)I2C_RCAR_GEN1 },
+        { .compatible = "renesas,rcar-gen2-i2c", .data = (void *)I2C_RCAR_GEN2 },
+        { .compatible = "renesas,rcar-gen3-i2c", .data = (void *)I2C_RCAR_GEN3 },
         {},
 };
 MODULE_DEVICE_TABLE(of, rcar_i2c_dt_ids);