[PATCH v6 4/9] nvmem: Add bindings for simple nvmem framework

[srinivas.kandagatla@linaro.org (Srinivas Kandagatla)]

This patch adds bindings for simple nvmem framework which allows nvmem
consumers to talk to nvmem providers to get access to nvmem cell data.

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
[Maxime Ripard: intial version of eeprom framework]
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
---
 Documentation/devicetree/bindings/nvmem/nvmem.txt | 85 +++++++++++++++++++++++
 1 file changed, 85 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/nvmem/nvmem.txt

diff --git a/Documentation/devicetree/bindings/nvmem/nvmem.txt b/Documentation/devicetree/bindings/nvmem/nvmem.txt
new file mode 100644
index 0000000..d1a37e7
--- /dev/null
+++ b/Documentation/devicetree/bindings/nvmem/nvmem.txt
@@ -0,0 +1,85 @@
+= NVMEM(Non Volatile Memory) Data Device Tree Bindings =
+
+This binding is intended to represent the location of hardware
+configuration data stored in NVMEMs like eeprom, efuses and so on.
+
+On a significant proportion of boards, the manufacturer has stored
+some data on NVMEM, for the OS to be able to retrieve these information
+and act upon it. Obviously, the OS has to know about where to retrieve
+these data from, and where they are stored on the storage device.
+
+This document is here to document this.
+
+= Data providers =
+Contains bindings specific to provider drivers and data cells as children
+of this node.
+
+Optional properties:
+ read-only: Mark the provider as read only.
+
+= Data cells =
+These are the child nodes of the provider which contain data cell
+information like offset and size in nvmem provider.
+
+Required properties:
+reg:	specifies the offset in byte within that storage device, start bit
+	in the byte and the length in bits of the data we care about.
+	There could be more than one offset-length pairs in this property.
+
+Optional properties:
+
+bit-offset: specifies the offset in bit within the address range specified
+	by reg property. Can take values from 0-7.
+nbits: specifies number of bits this cell occupies starting from bit-offset.
+
+For example:
+
+	/* Provider */
+	qfprom: qfprom at 00700000 {
+		...
+
+		/* Data cells */
+		tsens_calibration: calib at 404 {
+			reg = <0x404 0x10>;
+		};
+
+		tsens_calibration_bckp: calib_bckp at 504 {
+			reg = <0x504 0x11>;
+			bit-offset = 6;
+			nbits = 128;
+		};
+
+		pvs_version: pvs-version at 6 {
+			reg = <0x6 0x2>
+			bit-offset = 7;
+			nbits = 2;
+		};
+
+		speed_bin: speed-bin at c{
+			reg = <0xc 0x1>;
+			bit-offset = 2;
+			nbits	= 3;
+
+		};
+		...
+	};
+
+= Data consumers =
+Are device nodes which consume nvmem data cells/providers.
+
+Required-properties:
+nvmem-cell: list of phandle to the nvmem data cells.
+nvmem-cell-names: names for the each nvmem-cell specified. Required if
+	nvmem-cell is used.
+
+Optional-properties:
+nvmem	: list of phandles to nvmem providers.
+nvmem-names: names for the each nvmem provider. required if nvmem is used.
+
+For example:
+
+	tsens {
+		...
+		nvmem-cell = <&tsens_calibration>;
+		nvmem-cell-names = "calibration";
+	};
-- 
1.9.1