Re: [PATCH 5.10.y-cip 04/31] ASoC: dt-bindings: renesas,rz-ssi: Update slave dma channel configuration parameter


Pavel Machek
 

Hi!

From: Biju Das <biju.das.jz@...>

commit bed0b1c1e88a27b76c74584128cadebc6fa58622 upstream.

The DMAC on RZ/G2L has specific slave channel configuration
parameters for SSI.
This patch updates the dmas description and example node to include
the encoded slave channel configuration.
+++ b/Documentation/devicetree/bindings/sound/renesas,rz-ssi.yaml
@@ -48,6 +48,24 @@ properties:
dmas:
minItems: 1
maxItems: 2
+ description:
+ The first cell represents a phandle to dmac
+ The second cell specifies the encoded MID/RID values of the SSI port
+ connected to the DMA client and the slave channel configuration
+ parameters.
+ bits[0:9] - Specifies MID/RID value of a SSI channel as below
+ MID/RID value of SSI rx0 = 0x256
+ MID/RID value of SSI tx0 = 0x255
+ MID/RID value of SSI rx1 = 0x25a
+ MID/RID value of SSI tx1 = 0x259
+ MID/RID value of SSI rt2 = 0x25f
+ MID/RID value of SSI rx3 = 0x262
+ MID/RID value of SSI tx3 = 0x261
+ bit[10] - HIEN = 1, Detects a request in response to the rising edge
+ of the signal
+ bit[11] - LVL = 0, Detects based on the edge
+ bits[12:14] - AM = 2, Bus cycle mode
+ bit[15] - TM = 0, Single transfer mode
I wish there was better solution to this. Device tree sources are
quite human-readable, this really is not.

Best regards,
Pavel
--
DENX Software Engineering GmbH, Managing Director: Wolfgang Denk
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany

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