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| author |   Wolfram Sang <wsa+renesas@sang-engineering.com> | 2014-11-07 11:11:41 +0100 |
|---|---|---|
| committer |   Wolfram Sang <wsa@the-dreams.de> | 2014-11-12 17:08:40 +0100 |
| commit | 2d09581b4cc95c82b5fcc654e78b2d6de7350527 (patch) | |
| tree | 0aae176505533e752aa133c08dc562db4488135b /Documentation | |
| parent | i2c: sh_mobile: sort includes alphabetically (diff) | |
| download | linux-dev-2d09581b4cc95c82b5fcc654e78b2d6de7350527.tar.xz linux-dev-2d09581b4cc95c82b5fcc654e78b2d6de7350527.zip | |
i2c: sh_mobile: add DMA support
Make it possible to transfer i2c message buffers via DMA.
Start/Stop/Sending_Slave_Address is still handled using the old state
machine, it is sending the actual data that is done via DMA. This is
least intrusive and allows us to work with the message buffers directly
instead of preparing a custom buffer which involves copying the data
around.
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
[wsa: fixed an uninitialized var problem]
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/devicetree/bindings/i2c/i2c-sh_mobile.txt | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/i2c/i2c-sh_mobile.txt b/Documentation/devicetree/bindings/i2c/i2c-sh_mobile.txt index c33e9a32d496..2bfc6e7ed094 100644 --- a/Documentation/devicetree/bindings/i2c/i2c-sh_mobile.txt +++ b/Documentation/devicetree/bindings/i2c/i2c-sh_mobile.txt @@ -19,6 +19,11 @@ Required properties: Optional properties: - clock-frequency : frequency of bus clock in Hz. Default 100kHz if unset. +- dmas : Must contain a list of two references to DMA + specifiers, one for transmission, and one for + reception. +- dma-names : Must contain a list of two DMA names, "tx" and "rx". + Pinctrl properties might be needed, too. See there. |