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authorJia Hongtao <B38951@freescale.com>2012-03-01 17:32:34 +0800
committerKumar Gala <galak@kernel.crashing.org>2012-03-16 16:15:28 -0500
commite96dde2b5edbc0d385ccced05fb5db68c070b0d4 (patch)
treeb356160fa317ed64e557d3dcfa29d2d54ec615fd /Documentation/devicetree
parent8626816e905e8e131663dfcae27d307df8c220d0 (diff)
powerpc: document the FSL MPIC message register binding
This binding documents how the message register blocks found in some FSL MPIC implementations shall be represented in a device tree. Signed-off-by: Meador Inge <meador_inge@mentor.com> Signed-off-by: Jia Hongtao <B38951@freescale.com> Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
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+* FSL MPIC Message Registers
+
+This binding specifies what properties must be available in the device tree
+representation of the message register blocks found in some FSL MPIC
+implementations.
+
+Required properties:
+
+ - compatible: Specifies the compatibility list for the message register
+ block. The type shall be <string-list> and the value shall be of the form
+ "fsl,mpic-v<version>-msgr", where <version> is the version number of
+ the MPIC containing the message registers.
+
+ - reg: Specifies the base physical address(s) and size(s) of the
+ message register block's addressable register space. The type shall be
+ <prop-encoded-array>.
+
+ - interrupts: Specifies a list of interrupt-specifiers which are available
+ for receiving interrupts. Interrupt-specifier consists of two cells: first
+ cell is interrupt-number and second cell is level-sense. The type shall be
+ <prop-encoded-array>.
+
+Optional properties:
+
+ - mpic-msgr-receive-mask: Specifies what registers in the containing block
+ are allowed to receive interrupts. The value is a bit mask where a set
+ bit at bit 'n' indicates that message register 'n' can receive interrupts.
+ Note that "bit 'n'" is numbered from LSB for PPC hardware. The type shall
+ be <u32>. If not present, then all of the message registers in the block
+ are available.
+
+Aliases:
+
+ An alias should be created for every message register block. They are not
+ required, though. However, a particular implementation of this binding
+ may require aliases to be present. Aliases are of the form
+ 'mpic-msgr-block<n>', where <n> is an integer specifying the block's number.
+ Numbers shall start at 0.
+
+Example:
+
+ aliases {
+ mpic-msgr-block0 = &mpic_msgr_block0;
+ mpic-msgr-block1 = &mpic_msgr_block1;
+ };
+
+ mpic_msgr_block0: mpic-msgr-block@41400 {
+ compatible = "fsl,mpic-v3.1-msgr";
+ reg = <0x41400 0x200>;
+ // Message registers 0 and 2 in this block can receive interrupts on
+ // sources 0xb0 and 0xb2, respectively.
+ interrupts = <0xb0 2 0xb2 2>;
+ mpic-msgr-receive-mask = <0x5>;
+ };
+
+ mpic_msgr_block1: mpic-msgr-block@42400 {
+ compatible = "fsl,mpic-v3.1-msgr";
+ reg = <0x42400 0x200>;
+ // Message registers 0 and 2 in this block can receive interrupts on
+ // sources 0xb4 and 0xb6, respectively.
+ interrupts = <0xb4 2 0xb6 2>;
+ mpic-msgr-receive-mask = <0x5>;
+ };