diff options
| author | Arnd Bergmann <arnd@arndb.de> | 2013-01-28 20:24:37 +0400 |
|---|---|---|
| committer | Arnd Bergmann <arnd@arndb.de> | 2013-03-12 20:56:09 +0400 |
| commit | 787b0c1f8e1975157fe73104e67cac18f955281b (patch) | |
| tree | 4668c8a2a16baec67e71844840b85bea03cb5566 /Documentation/devicetree | |
| parent | dc715452e9145156840b09df765ea2ede4851eda (diff) | |
| download | linux-787b0c1f8e1975157fe73104e67cac18f955281b.tar.xz | |
serial: pl011: use generic DMA slave configuration if possible
With the new OF DMA binding, it is possible to completely avoid the
need for platform_data for configuring a DMA channel. In cases where the
platform has already been converted, calling dma_request_slave_channel
should get all the necessary information from the device tree.
This also adds a binding document specific to the pl011 controller,
and extends the generic primecell binding to mention "dmas" and other
common properties.
Like the patch that converts the dw_dma controller, this is completely
untested and is looking for someone to try it out.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Grant Likely <grant.likely@secretlab.ca>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Jiri Slaby <jslaby@suse.cz>
Cc: Viresh Kumar <viresh.kumar@linaro.org>
Cc: devicetree-discuss@lists.ozlabs.org
Cc: linux-arm-kernel@lists.infradead.org
Diffstat (limited to 'Documentation/devicetree')
| -rw-r--r-- | Documentation/devicetree/bindings/arm/primecell.txt | 19 | ||||
| -rw-r--r-- | Documentation/devicetree/bindings/serial/pl011.txt | 17 |
2 files changed, 35 insertions, 1 deletions
diff --git a/Documentation/devicetree/bindings/arm/primecell.txt b/Documentation/devicetree/bindings/arm/primecell.txt index 64fc82bc8928..0df6acacfaea 100644 --- a/Documentation/devicetree/bindings/arm/primecell.txt +++ b/Documentation/devicetree/bindings/arm/primecell.txt @@ -16,14 +16,31 @@ Optional properties: - clocks : From common clock binding. First clock is phandle to clock for apb pclk. Additional clocks are optional and specific to those peripherals. - clock-names : From common clock binding. Shall be "apb_pclk" for first clock. +- dmas : From common DMA binding. If present, refers to one or more dma channels. +- dma-names : From common DMA binding, needs to match the 'dmas' property. + Devices with exactly one receive and transmit channel shall name + these "rx" and "tx", respectively. +- pinctrl-<n> : Pinctrl states as described in bindings/pinctrl/pinctrl-bindings.txt +- pinctrl-names : Names corresponding to the numbered pinctrl states +- interrupts : one or more interrupt specifiers +- interrupt-names : names corresponding to the interrupts properties Example: serial@fff36000 { compatible = "arm,pl011", "arm,primecell"; arm,primecell-periphid = <0x00341011>; + clocks = <&pclk>; clock-names = "apb_pclk"; - + + dmas = <&dma-controller 4>, <&dma-controller 5>; + dma-names = "rx", "tx"; + + pinctrl-0 = <&uart0_default_mux>, <&uart0_default_mode>; + pinctrl-1 = <&uart0_sleep_mode>; + pinctrl-names = "default","sleep"; + + interrupts = <0 11 0x4>; }; diff --git a/Documentation/devicetree/bindings/serial/pl011.txt b/Documentation/devicetree/bindings/serial/pl011.txt new file mode 100644 index 000000000000..5d2e840ae65c --- /dev/null +++ b/Documentation/devicetree/bindings/serial/pl011.txt @@ -0,0 +1,17 @@ +* ARM AMBA Primecell PL011 serial UART + +Required properties: +- compatible: must be "arm,primecell", "arm,pl011" +- reg: exactly one register range with length 0x1000 +- interrupts: exactly one interrupt specifier + +Optional properties: +- pinctrl: When present, must have one state named "sleep" + and one state named "default" +- clocks: When present, must refer to exactly one clock named + "apb_pclk" +- dmas: When present, may have one or two dma channels. + The first one must be named "rx", the second one + must be named "tx". + +See also bindings/arm/primecell.txt |