diff options
| -rw-r--r-- | Documentation/powerpc/dts-bindings/fsl/ssi.txt | 15 | ||||
| -rw-r--r-- | arch/powerpc/boot/dts/mpc8610_hpcd.dts | 8 |
2 files changed, 20 insertions, 3 deletions
diff --git a/Documentation/powerpc/dts-bindings/fsl/ssi.txt b/Documentation/powerpc/dts-bindings/fsl/ssi.txt index d100555d488..5d9841303ca 100644 --- a/Documentation/powerpc/dts-bindings/fsl/ssi.txt +++ b/Documentation/powerpc/dts-bindings/fsl/ssi.txt @@ -24,6 +24,12 @@ Required properties: "rj-master" - r.j., SSI is clock master "ac97-slave" - AC97 mode, SSI is clock slave "ac97-master" - AC97 mode, SSI is clock master +- fsl,playback-dma: phandle to a DMA node for the DMA channel to use for + playback of audio. This is typically dictated by SOC + design. See the notes below. +- fsl,capture-dma: phandle to a DMA node for the DMA channel to use for + capture (recording) of audio. This is typically dictated + by SOC design. See the notes below. Optional properties: - codec-handle : phandle to a 'codec' node that defines an audio @@ -36,3 +42,12 @@ Child 'codec' node required properties: Child 'codec' node optional properties: - clock-frequency : The frequency of the input clock, which typically comes from an on-board dedicated oscillator. + +Notes on fsl,playback-dma and fsl,capture-dma: + +On SOCs that have an SSI, specific DMA channels are hard-wired for playback +and capture. On the MPC8610, for example, SSI1 must use DMA channel 0 for +playback and DMA channel 1 for capture. SSI2 must use DMA channel 2 for +playback and DMA channel 3 for capture. The developer can choose which +DMA controller to use, but the channels themselves are hard-wired. The +purpose of these two properties is to represent this hardware design. diff --git a/arch/powerpc/boot/dts/mpc8610_hpcd.dts b/arch/powerpc/boot/dts/mpc8610_hpcd.dts index 3b3a1062cb2..0f3a36e0ea6 100644 --- a/arch/powerpc/boot/dts/mpc8610_hpcd.dts +++ b/arch/powerpc/boot/dts/mpc8610_hpcd.dts @@ -207,7 +207,7 @@ reg = <0xe4000 0x100>; }; - i2s@16000 { + ssi@16000 { compatible = "fsl,mpc8610-ssi"; cell-index = <0>; reg = <0x16000 0x100>; @@ -215,6 +215,8 @@ interrupts = <62 2>; fsl,mode = "i2s-slave"; codec-handle = <&cs4270>; + fsl,playback-dma = <&dma00>; + fsl,capture-dma = <&dma01>; }; ssi@16100 { @@ -233,7 +235,7 @@ reg = <0x21300 0x4>; /* DMA general status register */ ranges = <0x0 0x21100 0x200>; - dma-channel@0 { + dma00: dma-channel@0 { compatible = "fsl,mpc8610-dma-channel", "fsl,eloplus-dma-channel"; cell-index = <0>; @@ -241,7 +243,7 @@ interrupt-parent = <&mpic>; interrupts = <20 2>; }; - dma-channel@1 { + dma01: dma-channel@1 { compatible = "fsl,mpc8610-dma-channel", "fsl,eloplus-dma-channel"; cell-index = <1>; |