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authorLinus Torvalds <torvalds@linux-foundation.org>2013-02-22 03:12:17 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2013-02-22 03:12:18 +0400
commit5ce7aba976ebdfbf467e3cbcd3a7536ebdec4b11 (patch)
treea31ceb4a167035aad73fd116ee8512fca905fd7b /Documentation/devicetree
parent7ae1c76ee5b58fe5bd55a07f99a3359333270b86 (diff)
parentb6a03d0492dedb5c10b8a5708ee92e04b0590c07 (diff)
downloadlinux-5ce7aba976ebdfbf467e3cbcd3a7536ebdec4b11.tar.xz
Merge tag 'drivers' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
Pull ARM SoC driver specific changes from Arnd Bergmann: - Updates to the ux500 cpufreq code - Moving the u300 DMA controller driver to drivers/dma - Moving versatile express drivers out of arch/arm for sharing with arch/arm64 - Device tree bindings for the OMAP General Purpose Memory Controller * tag 'drivers' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc: (27 commits) ARM: OMAP2+: gpmc: Add device tree documentation for elm handle ARM: OMAP2+: gpmc: add DT bindings for OneNAND ARM: OMAP2+: gpmc-onenand: drop __init annotation mtd: omap-onenand: pass device_node in platform data ARM: OMAP2+: Prevent potential crash if GPMC probe fails ARM: OMAP2+: gpmc: Remove unneeded of_node_put() arm: Move sp810.h to include/linux/amba/ ARM: OMAP: gpmc: add DT bindings for GPMC timings and NAND ARM: OMAP: gpmc: enable hwecc for AM33xx SoCs ARM: OMAP: gpmc-nand: drop __init annotation mtd: omap-nand: pass device_node in platform data ARM: OMAP: gpmc: don't create devices from initcall on DT dma: coh901318: cut down on platform data abstraction dma: coh901318: merge header files dma: coh901318: push definitions into driver dma: coh901318: push header down into the DMA subsystem dma: coh901318: skip hard-coded addresses dma: coh901318: remove hardcoded target addresses dma: coh901318: push platform data into driver dma: coh901318: create a proper platform data file ...
Diffstat (limited to 'Documentation/devicetree')
-rw-r--r--Documentation/devicetree/bindings/bus/ti-gpmc.txt84
-rw-r--r--Documentation/devicetree/bindings/mtd/gpmc-nand.txt80
-rw-r--r--Documentation/devicetree/bindings/mtd/gpmc-onenand.txt43
3 files changed, 207 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/bus/ti-gpmc.txt b/Documentation/devicetree/bindings/bus/ti-gpmc.txt
new file mode 100644
index 000000000000..5ddb2e9efaaa
--- /dev/null
+++ b/Documentation/devicetree/bindings/bus/ti-gpmc.txt
@@ -0,0 +1,84 @@
+Device tree bindings for OMAP general purpose memory controllers (GPMC)
+
+The actual devices are instantiated from the child nodes of a GPMC node.
+
+Required properties:
+
+ - compatible: Should be set to one of the following:
+
+ ti,omap2420-gpmc (omap2420)
+ ti,omap2430-gpmc (omap2430)
+ ti,omap3430-gpmc (omap3430 & omap3630)
+ ti,omap4430-gpmc (omap4430 & omap4460 & omap543x)
+ ti,am3352-gpmc (am335x devices)
+
+ - reg: A resource specifier for the register space
+ (see the example below)
+ - ti,hwmods: Should be set to "ti,gpmc" until the DT transition is
+ completed.
+ - #address-cells: Must be set to 2 to allow memory address translation
+ - #size-cells: Must be set to 1 to allow CS address passing
+ - gpmc,num-cs: The maximum number of chip-select lines that controller
+ can support.
+ - gpmc,num-waitpins: The maximum number of wait pins that controller can
+ support.
+ - ranges: Must be set up to reflect the memory layout with four
+ integer values for each chip-select line in use:
+
+ <cs-number> 0 <physical address of mapping> <size>
+
+ Currently, calculated values derived from the contents
+ of the per-CS register GPMC_CONFIG7 (as set up by the
+ bootloader) are used for the physical address decoding.
+ As this will change in the future, filling correct
+ values here is a requirement.
+
+Timing properties for child nodes. All are optional and default to 0.
+
+ - gpmc,sync-clk: Minimum clock period for synchronous mode, in picoseconds
+
+ Chip-select signal timings corresponding to GPMC_CONFIG2:
+ - gpmc,cs-on: Assertion time
+ - gpmc,cs-rd-off: Read deassertion time
+ - gpmc,cs-wr-off: Write deassertion time
+
+ ADV signal timings corresponding to GPMC_CONFIG3:
+ - gpmc,adv-on: Assertion time
+ - gpmc,adv-rd-off: Read deassertion time
+ - gpmc,adv-wr-off: Write deassertion time
+
+ WE signals timings corresponding to GPMC_CONFIG4:
+ - gpmc,we-on: Assertion time
+ - gpmc,we-off: Deassertion time
+
+ OE signals timings corresponding to GPMC_CONFIG4:
+ - gpmc,oe-on: Assertion time
+ - gpmc,oe-off: Deassertion time
+
+ Access time and cycle time timings corresponding to GPMC_CONFIG5:
+ - gpmc,page-burst-access: Multiple access word delay
+ - gpmc,access: Start-cycle to first data valid delay
+ - gpmc,rd-cycle: Total read cycle time
+ - gpmc,wr-cycle: Total write cycle time
+
+The following are only applicable to OMAP3+ and AM335x:
+ - gpmc,wr-access
+ - gpmc,wr-data-mux-bus
+
+
+Example for an AM33xx board:
+
+ gpmc: gpmc@50000000 {
+ compatible = "ti,am3352-gpmc";
+ ti,hwmods = "gpmc";
+ reg = <0x50000000 0x2000>;
+ interrupts = <100>;
+
+ gpmc,num-cs = <8>;
+ gpmc,num-waitpins = <2>;
+ #address-cells = <2>;
+ #size-cells = <1>;
+ ranges = <0 0 0x08000000 0x10000000>; /* CS0 @addr 0x8000000, size 0x10000000 */
+
+ /* child nodes go here */
+ };
diff --git a/Documentation/devicetree/bindings/mtd/gpmc-nand.txt b/Documentation/devicetree/bindings/mtd/gpmc-nand.txt
new file mode 100644
index 000000000000..e7f8d7ed47eb
--- /dev/null
+++ b/Documentation/devicetree/bindings/mtd/gpmc-nand.txt
@@ -0,0 +1,80 @@
+Device tree bindings for GPMC connected NANDs
+
+GPMC connected NAND (found on OMAP boards) are represented as child nodes of
+the GPMC controller with a name of "nand".
+
+All timing relevant properties as well as generic gpmc child properties are
+explained in a separate documents - please refer to
+Documentation/devicetree/bindings/bus/ti-gpmc.txt
+
+For NAND specific properties such as ECC modes or bus width, please refer to
+Documentation/devicetree/bindings/mtd/nand.txt
+
+
+Required properties:
+
+ - reg: The CS line the peripheral is connected to
+
+Optional properties:
+
+ - nand-bus-width: Set this numeric value to 16 if the hardware
+ is wired that way. If not specified, a bus
+ width of 8 is assumed.
+
+ - ti,nand-ecc-opt: A string setting the ECC layout to use. One of:
+
+ "sw" Software method (default)
+ "hw" Hardware method
+ "hw-romcode" gpmc hamming mode method & romcode layout
+ "bch4" 4-bit BCH ecc code
+ "bch8" 8-bit BCH ecc code
+
+ - elm_id: Specifies elm device node. This is required to support BCH
+ error correction using ELM module.
+
+For inline partiton table parsing (optional):
+
+ - #address-cells: should be set to 1
+ - #size-cells: should be set to 1
+
+Example for an AM33xx board:
+
+ gpmc: gpmc@50000000 {
+ compatible = "ti,am3352-gpmc";
+ ti,hwmods = "gpmc";
+ reg = <0x50000000 0x1000000>;
+ interrupts = <100>;
+ gpmc,num-cs = <8>;
+ gpmc,num-waitpins = <2>;
+ #address-cells = <2>;
+ #size-cells = <1>;
+ ranges = <0 0 0x08000000 0x2000>; /* CS0: NAND */
+ elm_id = <&elm>;
+
+ nand@0,0 {
+ reg = <0 0 0>; /* CS0, offset 0 */
+ nand-bus-width = <16>;
+ ti,nand-ecc-opt = "bch8";
+
+ gpmc,sync-clk = <0>;
+ gpmc,cs-on = <0>;
+ gpmc,cs-rd-off = <44>;
+ gpmc,cs-wr-off = <44>;
+ gpmc,adv-on = <6>;
+ gpmc,adv-rd-off = <34>;
+ gpmc,adv-wr-off = <44>;
+ gpmc,we-off = <40>;
+ gpmc,oe-off = <54>;
+ gpmc,access = <64>;
+ gpmc,rd-cycle = <82>;
+ gpmc,wr-cycle = <82>;
+ gpmc,wr-access = <40>;
+ gpmc,wr-data-mux-bus = <0>;
+
+ #address-cells = <1>;
+ #size-cells = <1>;
+
+ /* partitions go here */
+ };
+ };
+
diff --git a/Documentation/devicetree/bindings/mtd/gpmc-onenand.txt b/Documentation/devicetree/bindings/mtd/gpmc-onenand.txt
new file mode 100644
index 000000000000..deec9da224a2
--- /dev/null
+++ b/Documentation/devicetree/bindings/mtd/gpmc-onenand.txt
@@ -0,0 +1,43 @@
+Device tree bindings for GPMC connected OneNANDs
+
+GPMC connected OneNAND (found on OMAP boards) are represented as child nodes of
+the GPMC controller with a name of "onenand".
+
+All timing relevant properties as well as generic gpmc child properties are
+explained in a separate documents - please refer to
+Documentation/devicetree/bindings/bus/ti-gpmc.txt
+
+Required properties:
+
+ - reg: The CS line the peripheral is connected to
+
+Optional properties:
+
+ - dma-channel: DMA Channel index
+
+For inline partiton table parsing (optional):
+
+ - #address-cells: should be set to 1
+ - #size-cells: should be set to 1
+
+Example for an OMAP3430 board:
+
+ gpmc: gpmc@6e000000 {
+ compatible = "ti,omap3430-gpmc";
+ ti,hwmods = "gpmc";
+ reg = <0x6e000000 0x1000000>;
+ interrupts = <20>;
+ gpmc,num-cs = <8>;
+ gpmc,num-waitpins = <4>;
+ #address-cells = <2>;
+ #size-cells = <1>;
+
+ onenand@0 {
+ reg = <0 0 0>; /* CS0, offset 0 */
+
+ #address-cells = <1>;
+ #size-cells = <1>;
+
+ /* partitions go here */
+ };
+ };