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

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Message-Id: <20190325173501.22863-2-narmstrong@baylibre.com>
Date:   Mon, 25 Mar 2019 18:34:59 +0100
From:   Neil Armstrong <narmstrong@...libre.com>
To:     hverkuil@...all.nl, mchehab@...nel.org, devicetree@...r.kernel.org
Cc:     Neil Armstrong <narmstrong@...libre.com>,
        linux-amlogic@...ts.infradead.org, linux-media@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH 1/3] media: dt-bindings: media: meson-ao-cec: Add G12A AO-CEC-B Compatible

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 registers interface is very close but the internal architecture
is totally different.

The other difference is the closk 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@...libre.com>
---
 .../devicetree/bindings/media/meson-ao-cec.txt    | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/Documentation/devicetree/bindings/media/meson-ao-cec.txt b/Documentation/devicetree/bindings/media/meson-ao-cec.txt
index 8671bdb08080..d6e2f9cf0aaf 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
-	"amlogic,meson-gx-ao-cec"
+  - compatible : value should be following depending on the SoC :
+  	For GXBB, GXL, GXM and G12A (AO_CEC_A module) :
+  	"amlogic,meson-gx-ao-cec"
+	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
 
 Example:
-- 
2.21.0