soc: renesas: rcar-rst: add R8A77970 support

Add support for R-Car V3M (R8A77970) to the R-Car RST driver -- this driver
is  needed  for the clock driver to work.

Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
(cherry picked from commit 17760376ae31e06f66b3c3b8981f5978d4c53150)
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
diff --git a/Documentation/devicetree/bindings/reset/renesas,rst.txt b/Documentation/devicetree/bindings/reset/renesas,rst.txt
index e5a03ff..a8014f3 100644
--- a/Documentation/devicetree/bindings/reset/renesas,rst.txt
+++ b/Documentation/devicetree/bindings/reset/renesas,rst.txt
@@ -26,6 +26,7 @@
 		  - "renesas,r8a7794-rst" (R-Car E2)
 		  - "renesas,r8a7795-rst" (R-Car H3)
 		  - "renesas,r8a7796-rst" (R-Car M3-W)
+		  - "renesas,r8a77970-rst" (R-Car V3M)
 		  - "renesas,r8a77995-rst" (R-Car D3)
   - reg: Address start and address range for the device.
 
diff --git a/drivers/soc/renesas/Kconfig b/drivers/soc/renesas/Kconfig
index 567414c..f0d562a 100644
--- a/drivers/soc/renesas/Kconfig
+++ b/drivers/soc/renesas/Kconfig
@@ -3,7 +3,8 @@
 	default y if ARCH_RENESAS
 	select SOC_BUS
 	select RST_RCAR if ARCH_RCAR_GEN1 || ARCH_RCAR_GEN2 || \
-			   ARCH_R8A7795 || ARCH_R8A7796 || ARCH_R8A77995
+			   ARCH_R8A7795 || ARCH_R8A7796 || ARCH_R8A77970 || \
+			   ARCH_R8A77995
 	select SYSC_R8A7743 if ARCH_R8A7743
 	select SYSC_R8A7745 if ARCH_R8A7745
 	select SYSC_R8A7779 if ARCH_R8A7779
diff --git a/drivers/soc/renesas/rcar-rst.c b/drivers/soc/renesas/rcar-rst.c
index baa47014..3316b02 100644
--- a/drivers/soc/renesas/rcar-rst.c
+++ b/drivers/soc/renesas/rcar-rst.c
@@ -41,6 +41,7 @@
 	/* R-Car Gen3 is handled like R-Car Gen2 */
 	{ .compatible = "renesas,r8a7795-rst", .data = &rcar_rst_gen2 },
 	{ .compatible = "renesas,r8a7796-rst", .data = &rcar_rst_gen2 },
+	{ .compatible = "renesas,r8a77970-rst", .data = &rcar_rst_gen2 },
 	{ .compatible = "renesas,r8a77995-rst", .data = &rcar_rst_gen2 },
 	{ /* sentinel */ }
 };