From: Xiubo Li <Li.Xiubo@freescale.com>
To: broonie@kernel.org, mark.rutland@arm.com
Cc: robh+dt@kernel.org, pawel.moll@arm.com,
ijc+devicetree@hellion.org.uk, galak@codeaurora.org,
gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org,
devicetree@vger.kernel.org, Xiubo Li <Li.Xiubo@freescale.com>
Subject: [PATCHv6 2/2] dt/bindings: Add the DT binding documentation for endianness
Date: Tue, 15 Jul 2014 12:23:03 +0800 [thread overview]
Message-ID: <1405398183-31345-3-git-send-email-Li.Xiubo@freescale.com> (raw)
In-Reply-To: <1405398183-31345-1-git-send-email-Li.Xiubo@freescale.com>
Device-Tree binding for device endianness
Index Device Endianness properties
---------------------------------------------------
1 BE 'big-endian'
2 LE 'little-endian'
For one device driver, which will run in different scenarios above
on different SoCs using the devicetree, we need one way to simplify
this.
Signed-off-by: Xiubo Li <Li.Xiubo@freescale.com>
---
.../devicetree/bindings/regmap/regmap.txt | 47 ++++++++++++++++++++++
1 file changed, 47 insertions(+)
create mode 100644 Documentation/devicetree/bindings/regmap/regmap.txt
diff --git a/Documentation/devicetree/bindings/regmap/regmap.txt b/Documentation/devicetree/bindings/regmap/regmap.txt
new file mode 100644
index 0000000..b494f8b
--- /dev/null
+++ b/Documentation/devicetree/bindings/regmap/regmap.txt
@@ -0,0 +1,47 @@
+Device-Tree binding for regmap
+
+The endianness mode of CPU & Device scenarios:
+Index Device Endianness properties
+---------------------------------------------------
+1 BE 'big-endian'
+2 LE 'little-endian'
+
+For one device driver, which will run in different scenarios above
+on different SoCs using the devicetree, we need one way to simplify
+this.
+
+Required properties:
+- {big,little}-endian: these are boolean properties, if absent
+ meaning that the CPU and the Device are in the same endianness mode,
+ these properties are for register values and all the buffers only.
+
+Examples:
+Scenario 1 : CPU in LE mode & device in LE mode.
+dev: dev@40031000 {
+ compatible = "name";
+ reg = <0x40031000 0x1000>;
+ ...
+};
+
+Scenario 2 : CPU in LE mode & device in BE mode.
+dev: dev@40031000 {
+ compatible = "name";
+ reg = <0x40031000 0x1000>;
+ ...
+ big-endian;
+};
+
+Scenario 3 : CPU in BE mode & device in BE mode.
+dev: dev@40031000 {
+ compatible = "name";
+ reg = <0x40031000 0x1000>;
+ ...
+};
+
+Scenario 4 : CPU in BE mode & device in LE mode.
+dev: dev@40031000 {
+ compatible = "name";
+ reg = <0x40031000 0x1000>;
+ ...
+ little-endian;
+};
--
1.8.5
next prev parent reply other threads:[~2014-07-15 4:23 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-07-15 4:23 [PATCHv6 0/2] add DT endianness binding support for regmap Xiubo Li
2014-07-15 4:23 ` [PATCHv6 1/2] regmap: add DT endianness binding support Xiubo Li
2014-07-15 4:23 ` Xiubo Li [this message]
2014-07-15 5:33 ` [PATCHv6 2/2] dt/bindings: Add the DT binding documentation for endianness Varka Bhadram
[not found] ` <53C4BD24.9000503-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2014-07-15 5:36 ` Li.Xiubo-KZfg59tc24xl57MIdRCFDg
[not found] ` <1405398183-31345-3-git-send-email-Li.Xiubo-KZfg59tc24xl57MIdRCFDg@public.gmane.org>
2014-08-20 8:05 ` Thierry Reding
2014-08-20 9:14 ` Li.Xiubo-KZfg59tc24xl57MIdRCFDg
2014-08-20 9:43 ` Thierry Reding
2014-08-06 1:58 ` [PATCHv6 0/2] add DT endianness binding support for regmap Li.Xiubo
2014-08-16 13:14 ` Mark Brown
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