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gpio: rcar: add gen[123] fallback compatibility strings 

Add fallback compatibility string for R-Car Gen 1, 2 and 3.

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 being adopted for
drivers for Renesas SoCs.

Also deprecate renesas,gpio-rcar as its name is more generic than its
implementation.

Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Simon Horman 2017-07-11 14:38:30 +02:00 committed by Linus Walleij
parent 4a5c886e7c
commit dbd1dad2ab
2 changed files with 21 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
Documentation/devicetree/bindings/gpio/renesas,gpio-rcar.txt
View File

@ -2,7 +2,7 @@
Required Properties:
- compatible: should contain one of the following.
- compatible: should contain one or more of the following:
- "renesas,gpio-r8a7743": for R8A7743 (RZ/G1M) compatible GPIO controller.
- "renesas,gpio-r8a7778": for R8A7778 (R-Mobile M1) compatible GPIO controller.
- "renesas,gpio-r8a7779": for R8A7779 (R-Car H1) compatible GPIO controller.
@ -13,7 +13,14 @@ Required Properties:
- "renesas,gpio-r8a7794": for R8A7794 (R-Car E2) compatible GPIO controller.
- "renesas,gpio-r8a7795": for R8A7795 (R-Car H3) compatible GPIO controller.
- "renesas,gpio-r8a7796": for R8A7796 (R-Car M3-W) compatible GPIO controller.
- "renesas,gpio-rcar": for generic R-Car GPIO controller.
- "renesas,rcar-gen1-gpio": for a generic R-Car Gen1 GPIO controller.
- "renesas,rcar-gen2-gpio": for a generic R-Car Gen2 or RZ/G1 GPIO controller.
- "renesas,rcar-gen3-gpio": for a generic R-Car Gen3 GPIO controller.
- "renesas,gpio-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: Base address and length of each memory resource used by the GPIO
controller hardware module.
@ -43,7 +50,7 @@ interrupt-controller/interrupts.txt.
Example: R8A7779 (R-Car H1) GPIO controller nodes
gpio0: gpio@ffc40000 {
compatible = "renesas,gpio-r8a7779", "renesas,gpio-rcar";
compatible = "renesas,gpio-r8a7779", "renesas,rcar-gen1-gpio";
reg = <0xffc40000 0x2c>;
interrupt-parent = <&gic>;
interrupts = <0 141 0x4>;
@ -55,7 +62,7 @@ Example: R8A7779 (R-Car H1) GPIO controller nodes
};
...
gpio6: gpio@ffc46000 {
compatible = "renesas,gpio-r8a7779", "renesas,gpio-rcar";
compatible = "renesas,gpio-r8a7779", "renesas,rcar-gen1-gpio";
reg = <0xffc46000 0x2c>;
interrupt-parent = <&gic>;
interrupts = <0 147 0x4>;

10
drivers/gpio/gpio-rcar.c
View File

@ -370,6 +370,16 @@ static const struct of_device_id gpio_rcar_of_table[] = {
.compatible = "renesas,gpio-r8a7796",
/* Gen3 GPIO is identical to Gen2. */
.data = &gpio_rcar_info_gen2,
}, {
.compatible = "renesas,rcar-gen1-gpio",
.data = &gpio_rcar_info_gen1,
}, {
.compatible = "renesas,rcar-gen2-gpio",
.data = &gpio_rcar_info_gen2,
}, {
.compatible = "renesas,rcar-gen3-gpio",
/* Gen3 GPIO is identical to Gen2. */
.data = &gpio_rcar_info_gen2,
}, {
.compatible = "renesas,gpio-rcar",
.data = &gpio_rcar_info_gen1,