| Message ID | 20190401081959.16474-2-narmstrong@baylibre.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | media: platform: Add support for the Amlogic Meson G12A AO CEC Controller | expand |
On Mon, 1 Apr 2019 10:19:57 +0200, Neil Armstrong wrote: > 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@baylibre.com> > --- > .../devicetree/bindings/media/meson-ao-cec.txt | 13 ++++++++++--- > 1 file changed, 10 insertions(+), 3 deletions(-) > Reviewed-by: Rob Herring <robh@kernel.org>
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) : "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:
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@baylibre.com> --- .../devicetree/bindings/media/meson-ao-cec.txt | 13 ++++++++++--- 1 file changed, 10 insertions(+), 3 deletions(-)