reset: uniphier: add reset controller driver for UniPhier SoCs

This is the initial commit for UniPhier reset controller driver.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>

Documentation/devicetree/bindings/reset/uniphier-reset.txt

+UniPhier reset controller
+
+
+System reset
+------------
+
+Required properties:
+- compatible: should be one of the following:
+    "socionext,uniphier-sld3-reset" - for PH1-sLD3 SoC.
+    "socionext,uniphier-ld4-reset"  - for PH1-LD4 SoC.
+    "socionext,uniphier-pro4-reset" - for PH1-Pro4 SoC.
+    "socionext,uniphier-sld8-reset" - for PH1-sLD8 SoC.
+    "socionext,uniphier-pro5-reset" - for PH1-Pro5 SoC.
+    "socionext,uniphier-pxs2-reset" - for ProXstream2/PH1-LD6b SoC.
+    "socionext,uniphier-ld11-reset" - for PH1-LD11 SoC.
+    "socionext,uniphier-ld20-reset" - for PH1-LD20 SoC.
+- #reset-cells: should be 1.
+
+Example:
+
+	sysctrl@61840000 {
+		compatible = "socionext,uniphier-ld20-sysctrl",
+			     "simple-mfd", "syscon";
+		reg = <0x61840000 0x4000>;
+
+		reset {
+			compatible = "socionext,uniphier-ld20-reset";
+			#reset-cells = <1>;
+		};
+
+		other nodes ...
+	};
+
+
+Media I/O (MIO) reset
+---------------------
+
+Required properties:
+- compatible: should be one of the following:
+    "socionext,uniphier-sld3-mio-reset" - for PH1-sLD3 SoC.
+    "socionext,uniphier-ld4-mio-reset"  - for PH1-LD4 SoC.
+    "socionext,uniphier-pro4-mio-reset" - for PH1-Pro4 SoC.
+    "socionext,uniphier-sld8-mio-reset" - for PH1-sLD8 SoC.
+    "socionext,uniphier-pro5-mio-reset" - for PH1-Pro5 SoC.
+    "socionext,uniphier-pxs2-mio-reset" - for ProXstream2/PH1-LD6b SoC.
+    "socionext,uniphier-ld11-mio-reset" - for PH1-LD11 SoC.
+    "socionext,uniphier-ld20-mio-reset" - for PH1-LD20 SoC.
+- #reset-cells: should be 1.
+
+Example:
+
+	mioctrl@59810000 {
+		compatible = "socionext,uniphier-ld20-mioctrl",
+			     "simple-mfd", "syscon";
+		reg = <0x59810000 0x800>;
+
+		reset {
+			compatible = "socionext,uniphier-ld20-mio-reset";
+			#reset-cells = <1>;
+		};
+
+		other nodes ...
+	};
+
+
+Peripheral reset
+----------------
+
+Required properties:
+- compatible: should be one of the following:
+    "socionext,uniphier-ld4-peri-reset"  - for PH1-LD4 SoC.
+    "socionext,uniphier-pro4-peri-reset" - for PH1-Pro4 SoC.
+    "socionext,uniphier-sld8-peri-reset" - for PH1-sLD8 SoC.
+    "socionext,uniphier-pro5-peri-reset" - for PH1-Pro5 SoC.
+    "socionext,uniphier-pxs2-peri-reset" - for ProXstream2/PH1-LD6b SoC.
+    "socionext,uniphier-ld11-peri-reset" - for PH1-LD11 SoC.
+    "socionext,uniphier-ld20-peri-reset" - for PH1-LD20 SoC.
+- #reset-cells: should be 1.
+
+Example:
+
+	perictrl@59820000 {
+		compatible = "socionext,uniphier-ld20-perictrl",
+			     "simple-mfd", "syscon";
+		reg = <0x59820000 0x200>;
+
+		reset {
+			compatible = "socionext,uniphier-ld20-peri-reset";
+			#reset-cells = <1>;
+		};
+
+		other nodes ...
+	};

MAINTAINERS

@@ -1830,6 +1830,7 @@ F:	arch/arm64/boot/dts/socionext/
 F:	drivers/bus/uniphier-system-bus.c
 F:	drivers/i2c/busses/i2c-uniphier*
 F:	drivers/pinctrl/uniphier/
+F:	drivers/reset/reset-uniphier.c
 F:	drivers/tty/serial/8250/8250_uniphier.c
 N:	uniphier
 

drivers/reset/Kconfig

@@ -27,6 +27,16 @@ config TI_SYSCON_RESET
 	  you wish to use the reset framework for such memory-mapped devices,
 	  say Y here. Otherwise, say N.
 
+config RESET_UNIPHIER
+	tristate "Reset controller driver for UniPhier SoCs"
+	depends on ARCH_UNIPHIER || COMPILE_TEST
+	depends on OF && MFD_SYSCON
+	default ARCH_UNIPHIER
+	help
+	  Support for reset controllers on UniPhier SoCs.
+	  Say Y if you want to control reset signals provided by System Control
+	  block, Media I/O block, Peripheral Block.
+
 source "drivers/reset/sti/Kconfig"
 source "drivers/reset/hisilicon/Kconfig"
 

drivers/reset/Makefile

@@ -12,3 +12,4 @@ obj-$(CONFIG_ARCH_ZYNQ) += reset-zynq.o
 obj-$(CONFIG_ATH79) += reset-ath79.o
 obj-$(CONFIG_RESET_OXNAS) += reset-oxnas.o
 obj-$(CONFIG_TI_SYSCON_RESET) += reset-ti-syscon.o
+obj-$(CONFIG_RESET_UNIPHIER) += reset-uniphier.o