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Diffstat (limited to 'target/linux/ipq806x/patches/0053-of-document-bindings-for-reserved-memory-nodes.patch')
-rw-r--r-- | target/linux/ipq806x/patches/0053-of-document-bindings-for-reserved-memory-nodes.patch | 158 |
1 files changed, 0 insertions, 158 deletions
diff --git a/target/linux/ipq806x/patches/0053-of-document-bindings-for-reserved-memory-nodes.patch b/target/linux/ipq806x/patches/0053-of-document-bindings-for-reserved-memory-nodes.patch deleted file mode 100644 index 5363b70..0000000 --- a/target/linux/ipq806x/patches/0053-of-document-bindings-for-reserved-memory-nodes.patch +++ /dev/null @@ -1,158 +0,0 @@ -From 060a8e3db75ef98fb296b03b8fb0cdfcbcc76c6e Mon Sep 17 00:00:00 2001 -From: Grant Likely <grant.likely@linaro.org> -Date: Fri, 28 Feb 2014 14:42:46 +0100 -Subject: [PATCH 053/182] of: document bindings for reserved-memory nodes - -Reserved memory nodes allow for the reservation of static (fixed -address) regions, or dynamically allocated regions for a specific -purpose. - -[joshc: Based on binding document proposed (in non-patch form) here: - http://lkml.kernel.org/g/20131030134702.19B57C402A0@trevor.secretlab.ca - adapted to support #memory-region-cells] -Signed-off-by: Josh Cartwright <joshc@codeaurora.org> -[mszyprow: removed #memory-region-cells property] -Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com> -[grant.likely: removed residual #memory-region-cells example] -Signed-off-by: Grant Likely <grant.likely@linaro.org> ---- - .../bindings/reserved-memory/reserved-memory.txt | 133 ++++++++++++++++++++ - 1 file changed, 133 insertions(+) - create mode 100644 Documentation/devicetree/bindings/reserved-memory/reserved-memory.txt - ---- /dev/null -+++ b/Documentation/devicetree/bindings/reserved-memory/reserved-memory.txt -@@ -0,0 +1,133 @@ -+*** Reserved memory regions *** -+ -+Reserved memory is specified as a node under the /reserved-memory node. -+The operating system shall exclude reserved memory from normal usage -+one can create child nodes describing particular reserved (excluded from -+normal use) memory regions. Such memory regions are usually designed for -+the special usage by various device drivers. -+ -+Parameters for each memory region can be encoded into the device tree -+with the following nodes: -+ -+/reserved-memory node -+--------------------- -+#address-cells, #size-cells (required) - standard definition -+ - Should use the same values as the root node -+ranges (required) - standard definition -+ - Should be empty -+ -+/reserved-memory/ child nodes -+----------------------------- -+Each child of the reserved-memory node specifies one or more regions of -+reserved memory. Each child node may either use a 'reg' property to -+specify a specific range of reserved memory, or a 'size' property with -+optional constraints to request a dynamically allocated block of memory. -+ -+Following the generic-names recommended practice, node names should -+reflect the purpose of the node (ie. "framebuffer" or "dma-pool"). Unit -+address (@<address>) should be appended to the name if the node is a -+static allocation. -+ -+Properties: -+Requires either a) or b) below. -+a) static allocation -+ reg (required) - standard definition -+b) dynamic allocation -+ size (required) - length based on parent's #size-cells -+ - Size in bytes of memory to reserve. -+ alignment (optional) - length based on parent's #size-cells -+ - Address boundary for alignment of allocation. -+ alloc-ranges (optional) - prop-encoded-array (address, length pairs). -+ - Specifies regions of memory that are -+ acceptable to allocate from. -+ -+If both reg and size are present, then the reg property takes precedence -+and size is ignored. -+ -+Additional properties: -+compatible (optional) - standard definition -+ - may contain the following strings: -+ - shared-dma-pool: This indicates a region of memory meant to be -+ used as a shared pool of DMA buffers for a set of devices. It can -+ be used by an operating system to instanciate the necessary pool -+ management subsystem if necessary. -+ - vendor specific string in the form <vendor>,[<device>-]<usage> -+no-map (optional) - empty property -+ - Indicates the operating system must not create a virtual mapping -+ of the region as part of its standard mapping of system memory, -+ nor permit speculative access to it under any circumstances other -+ than under the control of the device driver using the region. -+reusable (optional) - empty property -+ - The operating system can use the memory in this region with the -+ limitation that the device driver(s) owning the region need to be -+ able to reclaim it back. Typically that means that the operating -+ system can use that region to store volatile or cached data that -+ can be otherwise regenerated or migrated elsewhere. -+ -+Linux implementation note: -+- If a "linux,cma-default" property is present, then Linux will use the -+ region for the default pool of the contiguous memory allocator. -+ -+Device node references to reserved memory -+----------------------------------------- -+Regions in the /reserved-memory node may be referenced by other device -+nodes by adding a memory-region property to the device node. -+ -+memory-region (optional) - phandle, specifier pairs to children of /reserved-memory -+ -+Example -+------- -+This example defines 3 contiguous regions are defined for Linux kernel: -+one default of all device drivers (named linux,cma@72000000 and 64MiB in size), -+one dedicated to the framebuffer device (named framebuffer@78000000, 8MiB), and -+one for multimedia processing (named multimedia-memory@77000000, 64MiB). -+ -+/ { -+ #address-cells = <1>; -+ #size-cells = <1>; -+ -+ memory { -+ reg = <0x40000000 0x40000000>; -+ }; -+ -+ reserved-memory { -+ #address-cells = <1>; -+ #size-cells = <1>; -+ ranges; -+ -+ /* global autoconfigured region for contiguous allocations */ -+ linux,cma { -+ compatible = "shared-dma-pool"; -+ reusable; -+ size = <0x4000000>; -+ alignment = <0x2000>; -+ linux,cma-default; -+ }; -+ -+ display_reserved: framebuffer@78000000 { -+ reg = <0x78000000 0x800000>; -+ }; -+ -+ multimedia_reserved: multimedia@77000000 { -+ compatible = "acme,multimedia-memory"; -+ reg = <0x77000000 0x4000000>; -+ }; -+ }; -+ -+ /* ... */ -+ -+ fb0: video@12300000 { -+ memory-region = <&display_reserved>; -+ /* ... */ -+ }; -+ -+ scaler: scaler@12500000 { -+ memory-region = <&multimedia_reserved>; -+ /* ... */ -+ }; -+ -+ codec: codec@12600000 { -+ memory-region = <&multimedia_reserved>; -+ /* ... */ -+ }; -+}; |