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Date: Tue, 6 Aug 2019 09:57:27 +0200
From: Neil Armstrong <narmstrong@...libre.com>
To: Rob Herring <robh+dt@...nel.org>
Cc: devicetree@...r.kernel.org,
dri-devel <dri-devel@...ts.freedesktop.org>,
linux-amlogic@...ts.infradead.org,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3] dt-bindings: display: amlogic,meson-dw-hdmi: convert
to yaml
On 06/08/2019 00:15, Rob Herring wrote:
> On Mon, Aug 5, 2019 at 7:43 AM Neil Armstrong <narmstrong@...libre.com> wrote:
>>
>> Now that we have the DT validation in place, let's convert the device tree
>> bindings for the Amlogic Synopsys DW-HDMI specifics over to YAML schemas.
>>
>> The original example and usage of clock-names uses a reversed "isfr"
>> and "iahb" clock-names, the rewritten YAML bindings uses the reversed
>> instead of fixing the device trees order.
>>
>> Signed-off-by: Neil Armstrong <narmstrong@...libre.com>
>> ---
>> .../display/amlogic,meson-dw-hdmi.txt | 119 -------------
>> .../display/amlogic,meson-dw-hdmi.yaml | 160 ++++++++++++++++++
>> 2 files changed, 160 insertions(+), 119 deletions(-)
>> delete mode 100644 Documentation/devicetree/bindings/display/amlogic,meson-dw-hdmi.txt
>> create mode 100644 Documentation/devicetree/bindings/display/amlogic,meson-dw-hdmi.yaml
>
>> diff --git a/Documentation/devicetree/bindings/display/amlogic,meson-dw-hdmi.yaml b/Documentation/devicetree/bindings/display/amlogic,meson-dw-hdmi.yaml
>> new file mode 100644
>> index 000000000000..1212aa7a624f
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/display/amlogic,meson-dw-hdmi.yaml
>> @@ -0,0 +1,160 @@
>> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
>> +# Copyright 2019 BayLibre, SAS
>> +%YAML 1.2
>> +---
>> +$id: "http://devicetree.org/schemas/display/amlogic,meson-dw-hdmi.yaml#"
>> +$schema: "http://devicetree.org/meta-schemas/core.yaml#"
>> +
>> +title: Amlogic specific extensions to the Synopsys Designware HDMI Controller
>> +
>> +maintainers:
>> + - Neil Armstrong <narmstrong@...libre.com>
>> +
>> +description: |
>> + The Amlogic Meson Synopsys Designware Integration is composed of
>> + - A Synopsys DesignWare HDMI Controller IP
>> + - A TOP control block controlling the Clocks and PHY
>> + - A custom HDMI PHY in order to convert video to TMDS signal
>> + ___________________________________
>> + | HDMI TOP |<= HPD
>> + |___________________________________|
>> + | | |
>> + | Synopsys HDMI | HDMI PHY |=> TMDS
>> + | Controller |________________|
>> + |___________________________________|<=> DDC
>> +
>> + The HDMI TOP block only supports HPD sensing.
>> + The Synopsys HDMI Controller interrupt is routed through the
>> + TOP Block interrupt.
>> + Communication to the TOP Block and the Synopsys HDMI Controller is done
>> + via a pair of dedicated addr+read/write registers.
>> + The HDMI PHY is configured by registers in the HHI register block.
>> +
>> + Pixel data arrives in "4:4:4" format from the VENC block and the VPU HDMI mux
>> + selects either the ENCI encoder for the 576i or 480i formats or the ENCP
>> + encoder for all the other formats including interlaced HD formats.
>> +
>> + The VENC uses a DVI encoder on top of the ENCI or ENCP encoders to generate
>> + DVI timings for the HDMI controller.
>> +
>> + Amlogic Meson GXBB, GXL and GXM SoCs families embeds the Synopsys DesignWare
>> + HDMI TX IP version 2.01a with HDCP and I2C & S/PDIF
>> + audio source interfaces.
>> +
>> + The following table lists for each supported model the port number
>> + corresponding to each HDMI output and input.
>> +
>> + Port 0 Port 1
>> + -----------------------------------------
>> + S905 (GXBB) VENC Input TMDS Output
>> + S905X (GXL) VENC Input TMDS Output
>> + S905D (GXL) VENC Input TMDS Output
>> + S912 (GXM) VENC Input TMDS Output
>> + S905X2 (G12A) VENC Input TMDS Output
>> + S905Y2 (G12A) VENC Input TMDS Output
>> + S905D2 (G12A) VENC Input TMDS Output
>
> Does this ever change?
Not for this one, I could remove the table and add the description
in port@0 and port@1.
>
>> +
>> +properties:
>> + compatible:
>> + oneOf:
>> + - items:
>> + - enum:
>> + - amlogic,meson-gxbb-dw-hdmi # GXBB (S905)
>> + - amlogic,meson-gxl-dw-hdmi # GXL (S905X, S905D)
>> + - amlogic,meson-gxm-dw-hdmi # GXM (S912)
>> + - const: amlogic,meson-gx-dw-hdmi
>> + - enum:
>> + - amlogic,meson-g12a-dw-hdmi # G12A (S905X2, S905Y2, S905D2)
>> +
>> + reg:
>> + maxItems: 1
>> +
>> + interrupts:
>> + maxItems: 1
>> +
>> + clocks:
>> + minItems: 3
>> +
>> + clock-names:
>> + items:
>> + - const: isfr
>> + - const: iahb
>> + - const: venci
>> +
>> + resets:
>> + minItems: 3
>> +
>> + reset-names:
>> + items:
>> + - const: hdmitx_apb
>> + - const: hdmitx
>> + - const: hdmitx_phy
>> +
>> + hdmi-supply:
>> + description: phandle to an external 5V regulator to power the HDMI logic
>> + allOf:
>> + - $ref: /schemas/types.yaml#/definitions/phandle
>> +
>> + port@0:
>> + type: object
>> + description:
>> + A port node modeled using the OF graph
>> + bindings specified in Documentation/devicetree/bindings/graph.txt.
>
> Would be better to say this is the VENC (or ...? input and drop the
> reference (as I expect graph.txt will be replaced with graph.yaml).
Yes
>
>> +
>> + port@1:
>> + type: object
>> + description:
>> + A port node modeled using the OF graph
>> + bindings specified in Documentation/devicetree/bindings/graph.txt.
>> +
>> + "#address-cells":
>> + const: 1
>> +
>> + "#size-cells":
>> + const: 0
>> +
>> +required:
>> + - compatible
>> + - reg
>> + - interrupts
>> + - clocks
>> + - clock-names
>> + - resets
>> + - reset-names
>> + - port@0
>> + - port@1
>> + - "#address-cells"
>> + - "#size-cells"
>
> Should be able to add an 'additionalProperties: false' here.
Ok
>
>> +
>> +examples:
>> + - |
>> + hdmi_tx: hdmi-tx@...3a000 {
>> + compatible = "amlogic,meson-gxbb-dw-hdmi", "amlogic,meson-gx-dw-hdmi";
>> + reg = <0xc883a000 0x1c>;
>> + interrupts = <57>;
>> + resets = <&reset_apb>, <&reset_hdmitx>, <&reset_hdmitx_phy>;
>> + reset-names = "hdmitx_apb", "hdmitx", "hdmitx_phy";
>> + clocks = <&clk_isfr>, <&clk_iahb>, <&clk_venci>;
>> + clock-names = "isfr", "iahb", "venci";
>> + #address-cells = <1>;
>> + #size-cells = <0>;
>> +
>> + /* VPU VENC Input */
>> + hdmi_tx_venc_port: port@0 {
>> + reg = <0>;
>> +
>> + hdmi_tx_in: endpoint {
>> + remote-endpoint = <&hdmi_tx_out>;
>> + };
>> + };
>> +
>> + /* TMDS Output */
>> + hdmi_tx_tmds_port: port@1 {
>> + reg = <1>;
>> +
>> + hdmi_tx_tmds_out: endpoint {
>> + remote-endpoint = <&hdmi_connector_in>;
>> + };
>> + };
>> + };
>> +
>> --
>> 2.22.0
>>
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