[PATCH v4 1/3] media: dt-bindings: media: meson-ao-cec: Add G12A AO-CEC-B Compatible

From: Neil Armstrong
Date: Mon Apr 08 2019 - 08:18:15 EST

The Amlogic G12A embeds a second CEC controller named AO-CEC-B, and
the other one is AO-CEC-A described by the current bindings.

The register interface is very close but the internal architecture
is totally different.

The other difference is the clock source, the AO-CEC-B takes the
"oscin", the Always-On Oscillator clock, as input and embeds a
dual-divider clock divider to provide the precise 32768Hz base
clock for CEC communication.

Signed-off-by: Neil Armstrong <narmstrong@xxxxxxxxxxxx>
Reviewed-by: Rob Herring <robh@xxxxxxxxxx>
.../devicetree/bindings/media/meson-ao-cec.txt | 13 ++++++++++---
1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/Documentation/devicetree/bindings/media/meson-ao-cec.txt b/Documentation/devicetree/bindings/media/meson-ao-cec.txt
index 8671bdb08080..c67fc41d4aa2 100644
--- a/Documentation/devicetree/bindings/media/meson-ao-cec.txt
+++ b/Documentation/devicetree/bindings/media/meson-ao-cec.txt
@@ -4,16 +4,23 @@ The Amlogic Meson AO-CEC module is present is Amlogic SoCs and its purpose is
to handle communication between HDMI connected devices over the CEC bus.

Required properties:
- - compatible : value should be following
+ - compatible : value should be following depending on the SoC :
+ For GXBB, GXL, GXM and G12A (AO_CEC_A module) :
+ For G12A (AO_CEC_B module) :
+ "amlogic,meson-g12a-ao-cec"

- reg : Physical base address of the IP registers and length of memory
mapped region.

- interrupts : AO-CEC interrupt number to the CPU.
- clocks : from common clock binding: handle to AO-CEC clock.
- - clock-names : from common clock binding: must contain "core",
- corresponding to entry in the clocks property.
+ - clock-names : from common clock binding, must contain :
+ For GXBB, GXL, GXM and G12A (AO_CEC_A module) :
+ - "core"
+ For G12A (AO_CEC_B module) :
+ - "oscin"
+ corresponding to entry in the clocks property.
- hdmi-phandle: phandle to the HDMI controller