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@xxxxxxxxxxxx>
---
Based on linux-gpio/for-next
---
.../devicetree/bindings/gpio/renesas,gpio-rcar.txt | 15 +++++++++++----
drivers/gpio/gpio-rcar.c | 10 ++++++++++
2 files changed, 21 insertions(+), 4 deletions(-)
diff --git a/Documentation/devicetree/bindings/gpio/renesas,gpio-rcar.txt b/Documentation/devicetree/bindings/gpio/renesas,gpio-rcar.txt
index 6826a371fb69..48634b01f1bf 100644
--- a/Documentation/devicetree/bindings/gpio/renesas,gpio-rcar.txt
+++ b/Documentation/devicetree/bindings/gpio/renesas,gpio-rcar.txt
@@ -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>;
diff --git a/drivers/gpio/gpio-rcar.c b/drivers/gpio/gpio-rcar.c
index 4a1536a050bc..1f0871553fd2 100644
--- a/drivers/gpio/gpio-rcar.c
+++ b/drivers/gpio/gpio-rcar.c
@@ -371,6 +371,16 @@ static const struct of_device_id gpio_rcar_of_table[] = {
/* 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,
}, {
--
2.1.4
