From ad4a8dc3fec6485b18654d1090ef8012fcfc37b8 Mon Sep 17 00:00:00 2001 From: Simon Horman Date: Tue, 6 Dec 2016 17:01:28 +0100 Subject: 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 Reviewed-by: Geert Uytterhoeven Signed-off-by: Wolfram Sang --- Documentation/devicetree/bindings/i2c/i2c-rcar.txt | 32 ++++++++++++++-------- 1 file changed, 20 insertions(+), 12 deletions(-) (limited to 'Documentation/devicetree/bindings/i2c') 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>; -- cgit v1.2.1