Add reset controller driver exposing various reset faculties,
implemented by System Reset Controller IP block.

Cc: Lucas Stach <l.stach@pengutronix.de>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: devicetree@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: linux-arm-kernel@lists.infradead.org
Signed-off-by: Andrey Smirnov <redacted>
---

Changes since v3 (see [v3]):

	- Convert code IMX7_RESET_PCIEPHY to change G_RST and BTNRST
          simultaneously to make all resets be representable as
          signal->bit in signal->offset register

	- Convert assert/deassert subroutines to be special cases of a
          common reset subroutine

Changes since v2 (see [v2]):

	- Fix typos

	- Kconfig/Makefile chagnes account for alphabetical sorting of
          those files

	- Remove redundant includes

	- Make use of regmap_attach_dev and avoid storing refernce to
          struct *dev in private data

	- Change code and headers to expose almost all of the reset
          related bits in SRC IP block

Changes since v1 (see [v1]):

	- Various small DT bindings description fixes as per feedback
          from Rob Herring


[v1] https://lkml.org/lkml/2017/2/6/554
[v2] https://lkml.org/lkml/2017/2/13/488
[v3] https://lkml.org/lkml/2017/2/20/344


 .../devicetree/bindings/reset/fsl,imx7-src.txt     |  47 ++++++
 drivers/reset/Kconfig                              |   8 ++
 drivers/reset/Makefile                             |   2 +
 drivers/reset/reset-imx7.c                         | 158 +++++++++++++++++++++
 include/dt-bindings/reset/imx7-reset.h             |  62 ++++++++
 5 files changed, 277 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/reset/fsl,imx7-src.txt
 create mode 100644 drivers/reset/reset-imx7.c
 create mode 100644 include/dt-bindings/reset/imx7-reset.h

diff --git a/Documentation/devicetree/bindings/reset/fsl,imx7-src.txt b/Documentation/devicetree/bindings/reset/fsl,imx7-src.txt
new file mode 100644
index 0000000..5e1afc3
--- /dev/null
+++ b/Documentation/devicetree/bindings/reset/fsl,imx7-src.txt

@@ -0,0 +1,47 @@
+Freescale i.MX7 System Reset Controller
+======================================
+
+Please also refer to reset.txt in this directory for common reset
+controller binding usage.
+
+Required properties:
+- compatible: Should be "fsl,imx7-src", "syscon"
+- reg: should be register base and length as documented in the
+  datasheet
+- interrupts: Should contain SRC interrupt
+- #reset-cells: 1, see below
+
+example:
+
+src: reset-controller@30390000 {
+     compatible = "fsl,imx7d-src", "syscon";
+     reg = <0x30390000 0x2000>;
+     interrupts = <GIC_SPI 89 IRQ_TYPE_LEVEL_HIGH>;
+     #reset-cells = <1>;
+};
+
+
+Specifying reset lines connected to IP modules
+==============================================
+
+The system reset controller can be used to reset various set of
+peripherals. Device nodes that need access to reset lines should
+specify them as a reset phandle in their corresponding node as
+specified in reset.txt.
+
+Example:
+
+	pcie: pcie@33800000 {
+
+		...
+
+		resets = <&src IMX7_RESET_PCIEPHY>,
+			 <&src IMX7_RESET_PCIE_CTRL_APPS_EN>;
+		reset-names = "pciephy", "apps";
+
+		...
+        };
+
+
+For list of all valid reset indicies see
+<dt-bindings/reset/imx7-reset.h>

diff --git a/drivers/reset/Kconfig b/drivers/reset/Kconfig
index 172dc96..bea1800 100644
--- a/drivers/reset/Kconfig
+++ b/drivers/reset/Kconfig

@@ -27,6 +27,14 @@ config RESET_BERLIN
 	help
 	  This enables the reset controller driver for Marvell Berlin SoCs.
 
+config RESET_IMX7
+	bool "i.MX7 Reset Driver"
+	depends on SOC_IMX7D || COMPILE_TEST
+	select MFD_SYSCON
+	default SOC_IMX7D