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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> Reviewed-by: Rob Herring <robh@kernel.org> Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
36 lines
1.1 KiB
Plaintext
36 lines
1.1 KiB
Plaintext
* Amlogic Meson AO-CEC driver
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The Amlogic Meson AO-CEC module is present is Amlogic SoCs and its purpose is
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to handle communication between HDMI connected devices over the CEC bus.
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Required properties:
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- compatible : value should be following depending on the SoC :
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For GXBB, GXL, GXM and G12A (AO_CEC_A module) :
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"amlogic,meson-gx-ao-cec"
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For G12A (AO_CEC_B module) :
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"amlogic,meson-g12a-ao-cec"
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- reg : Physical base address of the IP registers and length of memory
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mapped region.
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- interrupts : AO-CEC interrupt number to the CPU.
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- clocks : from common clock binding: handle to AO-CEC clock.
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- clock-names : from common clock binding, must contain :
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For GXBB, GXL, GXM and G12A (AO_CEC_A module) :
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- "core"
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For G12A (AO_CEC_B module) :
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- "oscin"
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corresponding to entry in the clocks property.
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- hdmi-phandle: phandle to the HDMI controller
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Example:
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cec_AO: cec@100 {
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compatible = "amlogic,meson-gx-ao-cec";
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reg = <0x0 0x00100 0x0 0x14>;
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interrupts = <GIC_SPI 199 IRQ_TYPE_EDGE_RISING>;
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clocks = <&clkc_AO CLKID_AO_CEC_32K>;
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clock-names = "core";
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hdmi-phandle = <&hdmi_tx>;
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};
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