linux-kernel - [PATCH v5 06/11] nvmem: Add bindings for simple nvmem framework

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Message-Id: <1432226652-8947-1-git-send-email-srinivas.kandagatla@linaro.org>
Date:	Thu, 21 May 2015 17:44:12 +0100
From:	Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	Rob Herring <robh+dt@...nel.org>,
	Kumar Gala <galak@...eaurora.org>,
	Mark Brown <broonie@...nel.org>, s.hauer@...gutronix.de,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-api@...r.kernel.org, linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org, linux-arm-msm@...r.kernel.org,
	arnd@...db.de, sboyd@...eaurora.org,
	Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
	pantelis.antoniou@...sulko.com, mporter@...sulko.com
Subject: [PATCH v5 06/11] nvmem: Add bindings for simple nvmem framework

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@...e-electrons.com>
[Maxime Ripard: intial version of eeprom framework]
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
---
 Documentation/devicetree/bindings/nvmem/nvmem.txt | 84 +++++++++++++++++++++++
 1 file changed, 84 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..ecea654
--- /dev/null
+++ b/Documentation/devicetree/bindings/nvmem/nvmem.txt
@@ -0,0 +1,84 @@
+= NVMEM Data Device Tree Bindings =
+
+This binding is intended to represent the location of hardware
+configuration data stored in NVMEMs.
+
+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
+to 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 then 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@...00000 {
+		...
+
+		/* Data cells */
+		tsens_calibration: calib@404 {
+			reg = <0x404 0x10>;
+		};
+
+		tsens_calibration_bckp: calib_bckp@504 {
+			reg = <0x504 0x11>;
+			bit-offset = 6;
+			nbits = 128;
+		};
+
+		pvs_version: pvs-version@6 {
+			reg = <0x6 0x2>
+			bit-offset = 7;
+			nbits = 2;
+		};
+
+		speed_bin: speed-bin@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
+
+Optional-properties:
+nvmem	: list of phandles to nvmem providers.
+nvmem-names: names for the each nvmem provider.
+
+For example:
+
+	tsens {
+		...
+		nvmem-cell = <&tsens_calibration>;
+		nvmem-cell-names = "calibration";
+	};
-- 
1.9.1

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