On Thu, Dec 01, 2016 at 04:55:13PM +0100, Geert Uytterhoeven wrote: > Hi Simon, > > On Thu, Dec 1, 2016 at 4:41 PM, Simon Horman <horms+renesas@xxxxxxxxxxxx> wrote: > > 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 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 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. > > > > Signed-off-by: Simon Horman <horms+renesas@xxxxxxxxxxxx> > > --- > > Include accidently omitted i2c-rcar.c portion of patch > > --- > > Documentation/devicetree/bindings/i2c/i2c-rcar.txt | 32 ++++++++++++++-------- > > drivers/i2c/busses/i2c-rcar.c | 5 +++- > > 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..8c679b17c4c6 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 R8A7797 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,i2c-rcar-gen1" for a generic R-Car Gen1 compatible device. > > + "renesas,i2c-rcar-gen2" for a generic R-Car Gen2 compatible device. > > + "renesas,i2c-rcar-gen3" for a generic R-Car Gen3 compatible device. > > "renesas,rcar-gen1-i2c" etc. > > > + "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,i2c-rcar-gen2"; > > "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..622def6b43e2 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 }, > > The driver does it right ;-) Sorry, I switched things around at some point but it looks like I only did half the job. -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html