The Freescale Serial Synchronous Interface (SSI) is an audio device present on
some Freescale SOCs. Various implementations of the SSI have a different
transmit and receive FIFO depth, but are otherwise identical. To support
these variations, add a new property fsl,fifo-depth to the SSI node that
specifies the depth of the FIFOs.
Also update the MPC8610 HPCD device tree with this property.
Signed-off-by: Timur Tabi ti...@freescale.com
---
Updates to the SSI audio driver will come later. Currently, this driver
supports only one Freescale SOC, and so it's hard-coded to use the value 8.
If/when this driver is updated to support other SOCs (e.g. the i.MX parts
that have a FIFO depth of 15), the driver will check for this property. I
just want to get this DTS change in now.
Documentation/powerpc/dts-bindings/fsl/ssi.txt |2 ++
arch/powerpc/boot/dts/mpc8610_hpcd.dts |2 ++
2 files changed, 4 insertions(+), 0 deletions(-)
diff --git a/Documentation/powerpc/dts-bindings/fsl/ssi.txt
b/Documentation/powerpc/dts-bindings/fsl/ssi.txt
index a2d9639..7313322 100644
--- a/Documentation/powerpc/dts-bindings/fsl/ssi.txt
+++ b/Documentation/powerpc/dts-bindings/fsl/ssi.txt
@@ -30,6 +30,8 @@ Required properties:
- fsl,capture-dma: phandle to a node for the DMA channel to use for
capture (recording) of audio. This is typically dictated
by SOC design. See the notes below.
+- fsl,fifo-depth: the number of elements in the transmit and receive FIFOs.
+This number is the maximum allowed value for SFCSR[TFWM0].
Optional properties:
- codec-handle : phandle to a 'codec' node that defines an audio
diff --git a/arch/powerpc/boot/dts/mpc8610_hpcd.dts
b/arch/powerpc/boot/dts/mpc8610_hpcd.dts
index f724d72..1bd3ebe 100644
--- a/arch/powerpc/boot/dts/mpc8610_hpcd.dts
+++ b/arch/powerpc/boot/dts/mpc8610_hpcd.dts
@@ -217,6 +217,7 @@
codec-handle = cs4270;
fsl,playback-dma = dma00;
fsl,capture-dma = dma01;
+ fsl,fifo-depth = 8;
};
s...@16100 {
@@ -225,6 +226,7 @@
reg = 0x16100 0x100;
interrupt-parent = mpic;
interrupts = 63 2;
+ fsl,fifo-depth = 8;
};
d...@21300 {
--
1.6.1.3
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