ASoC: meson: add reset binding

The g12a audio subsystem, which is a derivative of the axg subsystem,
provides a dedicated reset line for each of the audio components.

The axg did not provide that and it is unclear if/when these reset are
required. The reset already helped solve a channel mapping issue on the
tdm formatter devices. Let's add the reset binding for the other
components, so we can describe this in DT. We'll use it later on
in the driver when/if needed.

Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Link: https://lore.kernel.org/r/20190905120120.31752-3-jbrunet@baylibre.com
Signed-off-by: Mark Brown <broonie@kernel.org>

1 files changed, 4 insertions, 1 deletions

diff --git a/Documentation/devicetree/bindings/sound/amlogic,axg-fifo.txt b/Documentation/devicetree/bindings/sound/amlogic,axg-fifo.txt
index 4b17073c8f8c..3080979350a0 100644
--- a/Documentation/devicetree/bindings/sound/amlogic,axg-fifo.txt
+++ b/Documentation/devicetree/bindings/sound/amlogic,axg-fifo.txt
@@ -12,7 +12,10 @@ Required properties:
 - interrupts: interrupt specifier for the fifo.
 - clocks: phandle to the fifo peripheral clock provided by the audio
 	  clock controller.
-- resets: phandle to memory ARB line provided by the arb reset controller.
+- resets: list of reset phandle, one for each entry reset-names.
+- reset-names: should contain the following:
+  * "arb" : memory ARB line (required)
+  * "rst" : dedicated device reset line (optional)
 - #sound-dai-cells: must be 0.
 
 Example of FRDDR A on the A113 SoC: