[PATCH v6 09/10] spi: omap2-mcspi: add generic DMA request support to the DT binding
The binding definition is based on the generic DMA request binding
Signed-off-by: Matt Porter
---
Documentation/devicetree/bindings/spi/omap-spi.txt | 27 +++-
1 file changed, 26 insertions(+), 1 deletion(-)
diff --git a/Documentation/devicetree/bindings/spi/omap-spi.txt
b/Documentation/devicetree/bindings/spi/omap-spi.txt
index 938809c..68cb28e 100644
--- a/Documentation/devicetree/bindings/spi/omap-spi.txt
+++ b/Documentation/devicetree/bindings/spi/omap-spi.txt
@@ -10,7 +10,18 @@ Required properties:
input. The default is D0 as input and
D1 as output.
-Example:
+Optional properties:
+- dmas: List of DMA controller phandle and DMA request ordered
+ pairs. One tx and one rx pair is required for each chip
+ select.
+- dma-names: List of DMA request names. These strings correspond
+ 1:1 with the ordered pairs in dmas. The string naming is
+ to be "rxN" and "txN" for RX and TX requests,
+ respectively, where N equals the chip select number.
+
+Examples:
+
+[hwmod populated DMA resources]
mcspi1: mcspi@1 {
#address-cells = <1>;
@@ -20,3 +31,17 @@ mcspi1: mcspi@1 {
ti,spi-num-cs = <4>;
};
+[generic DMA request binding]
+
+mcspi1: mcspi@1 {
+#address-cells = <1>;
+#size-cells = <0>;
+compatible = "ti,omap4-mcspi";
+ti,hwmods = "mcspi1";
+ti,spi-num-cs = <2>;
+dmas = <&edma 42
+ &edma 43
+ &edma 44
+ &edma 45>;
+dma-names = "tx0", "rx0", "tx1", "rx1";
+};
--
1.7.9.5
___
Davinci-linux-open-source mailing list
Davinci-linux-open-source@linux.davincidsp.com
http://linux.davincidsp.com/mailman/listinfo/davinci-linux-open-source
Re: [PATCH v6 09/10] spi: omap2-mcspi: add generic DMA request support to the DT binding
On Wednesday 30 January 2013, Matt Porter wrote: > +Optional properties: > +- dmas: List of DMA controller phandle and DMA request ordered > + pairs. One tx and one rx pair is required for each chip > + select. The binding looks ok, but the wording is slightly incorrect here: strictly speaking, it's not a pair of controller phandle and request line number, but a DMA descriptor as specified in bindings/dma/dma.txt with a format specific to the dma engine being used. That can require more than just a single integer request number. Arnd ___ Davinci-linux-open-source mailing list Davinci-linux-open-source@linux.davincidsp.com http://linux.davincidsp.com/mailman/listinfo/davinci-linux-open-source
Re: [PATCH v6 09/10] spi: omap2-mcspi: add generic DMA request support to the DT binding
On Wed, Jan 30, 2013 at 09:24:00AM +, Arnd Bergmann wrote: > On Wednesday 30 January 2013, Matt Porter wrote: > > +Optional properties: > > +- dmas: List of DMA controller phandle and DMA request ordered > > + pairs. One tx and one rx pair is required for each chip > > + select. > > The binding looks ok, but the wording is slightly incorrect here: > strictly speaking, it's not a pair of controller phandle and request > line number, but a DMA descriptor as specified in bindings/dma/dma.txt > with a format specific to the dma engine being used. That can > require more than just a single integer request number. Correct. I will update accordingly. -Matt ___ Davinci-linux-open-source mailing list Davinci-linux-open-source@linux.davincidsp.com http://linux.davincidsp.com/mailman/listinfo/davinci-linux-open-source
