[PATCH 18/62] soc_camera: rcar_vin: add R-Car Gen 2 and 3 fallback compatibility strings

Biju Das <biju.das@...>

From: Yoshihiro Kaneko <ykaneko0929@...>

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

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

Signed-off-by: Yoshihiro Kaneko <ykaneko0929@...>
Signed-off-by: Simon Horman <horms+renesas@...>
Acked-by: Geert Uytterhoeven <geert+renesas@...>
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@...>
Signed-off-by: Mauro Carvalho Chehab <mchehab@...>
(cherry picked from commit bd546882ff3476718d6df872c1c95aedcc5ed37d)
(removed gen3 devices)
Signed-off-by: Biju Das <biju.das@...>
Reviewed-by: Fabrizio Castro <fabrizio.castro@...>
Documentation/devicetree/bindings/media/rcar_vin.txt | 10 ++++++++--
drivers/media/platform/soc_camera/rcar_vin.c | 1 +
2 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/Documentation/devicetree/bindings/media/rcar_vin.txt b/Documentation/devicetree/bindings/media/rcar_vin.txt
index 9dafe6b..1abe1ef 100644
--- a/Documentation/devicetree/bindings/media/rcar_vin.txt
+++ b/Documentation/devicetree/bindings/media/rcar_vin.txt
@@ -5,13 +5,19 @@ The rcar_vin device provides video input capabilities for the Renesas R-Car
family of devices. The current blocks are always slaves and suppot one input
channel which can be either RGB, YUYV or BT656.

- - compatible: Must be one of the following
+ - compatible: Must be one or more of the following
- "renesas,vin-r8a7794" for the R8A7794 device
- "renesas,vin-r8a7793" for the R8A7793 device
- "renesas,vin-r8a7791" for the R8A7791 device
- "renesas,vin-r8a7790" for the R8A7790 device
- "renesas,vin-r8a7779" for the R8A7779 device
- "renesas,vin-r8a7778" for the R8A7778 device
+ - "renesas,rcar-gen2-vin" for a generic R-Car Gen2 compatible device.
+ When compatible with the generic version nodes must list the
+ SoC-specific version corresponding to the platform first
+ followed by the generic version.
- reg: the register base and size for the device registers
- interrupts: the interrupt for the device
- clocks: Reference to the parent clock
@@ -36,7 +42,7 @@ Device node example

vin0: vin@0xe6ef0000 {
- compatible = "renesas,vin-r8a7790";
+ compatible = "renesas,vin-r8a7790", "renesas,rcar-gen2-vin";
clocks = <&mstp8_clks R8A7790_CLK_VIN0>;
reg = <0 0xe6ef0000 0 0x1000>;
interrupts = <0 188 IRQ_TYPE_LEVEL_HIGH>;
diff --git a/drivers/media/platform/soc_camera/rcar_vin.c b/drivers/media/platform/soc_camera/rcar_vin.c
index efe57b2..dfb2c72 100644
--- a/drivers/media/platform/soc_camera/rcar_vin.c
+++ b/drivers/media/platform/soc_camera/rcar_vin.c
@@ -1848,6 +1848,7 @@ static const struct of_device_id rcar_vin_of_table[] = {
{ .compatible = "renesas,vin-r8a7790", .data = (void *)RCAR_GEN2 },
{ .compatible = "renesas,vin-r8a7779", .data = (void *)RCAR_H1 },
{ .compatible = "renesas,vin-r8a7778", .data = (void *)RCAR_M1 },
+ { .compatible = "renesas,rcar-gen2-vin", .data = (void *)RCAR_GEN2 },
{ },
MODULE_DEVICE_TABLE(of, rcar_vin_of_table);

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