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Date: Thu, 3 Nov 2022 08:45:30 -0400
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Guillaume Ranquet <granquet@...libre.com>,
Chun-Kuang Hu <chunkuang.hu@...nel.org>,
Chunfeng Yun <chunfeng.yun@...iatek.com>,
David Airlie <airlied@...il.com>,
Philipp Zabel <p.zabel@...gutronix.de>,
Jitao shi <jitao.shi@...iatek.com>, CK Hu <ck.hu@...iatek.com>,
Rob Herring <robh+dt@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Vinod Koul <vkoul@...nel.org>,
Kishon Vijay Abraham I <kishon@...com>,
Matthias Brugger <matthias.bgg@...il.com>,
Daniel Vetter <daniel@...ll.ch>
Cc: stuart.lee@...iatek.com, linux-phy@...ts.infradead.org,
devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
AngeloGioacchino Del Regno
<angelogioacchino.delregno@...labora.com>,
linux-kernel@...r.kernel.org, mac.shen@...iatek.com,
linux-mediatek@...ts.infradead.org, dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH v2 02/12] dt-bindings: display: mediatek: add MT8195 hdmi
bindings
On 02/11/2022 09:31, Guillaume Ranquet wrote:
> On Fri, 14 Oct 2022 18:08, Krzysztof Kozlowski
> <krzysztof.kozlowski@...aro.org> wrote:
>> On 14/10/2022 11:15, Guillaume Ranquet wrote:
>>> Add mt8195 SoC bindings for hdmi and hdmi-ddc
>>>
>>> Signed-off-by: Guillaume Ranquet <granquet@...libre.com>
>>> ---
>>> .../bindings/display/mediatek/mediatek,hdmi.yaml | 67 +++++++++++++++++-----
>>> .../display/mediatek/mediatek,mt8195-hdmi-ddc.yaml | 51 ++++++++++++++++
>>> 2 files changed, 104 insertions(+), 14 deletions(-)
>>>
>>> diff --git a/Documentation/devicetree/bindings/display/mediatek/mediatek,hdmi.yaml b/Documentation/devicetree/bindings/display/mediatek/mediatek,hdmi.yaml
>>> index bdaf0b51e68c..955026cd7ca5 100644
>>> --- a/Documentation/devicetree/bindings/display/mediatek/mediatek,hdmi.yaml
>>> +++ b/Documentation/devicetree/bindings/display/mediatek/mediatek,hdmi.yaml
>>> @@ -21,26 +21,21 @@ properties:
>>> - mediatek,mt7623-hdmi
>>> - mediatek,mt8167-hdmi
>>> - mediatek,mt8173-hdmi
>>> + - mediatek,mt8195-hdmi
>>>
>>> reg:
>>> maxItems: 1
>>>
>>> - interrupts:
>>> - maxItems: 1
>>> -
>>
>> This change is not really explained in commit msg...
>>
>>> clocks:
>>> - items:
>>> - - description: Pixel Clock
>>> - - description: HDMI PLL
>>> - - description: Bit Clock
>>> - - description: S/PDIF Clock
>>> + minItems: 4
>>> + maxItems: 4
>>>
>>> clock-names:
>>> - items:
>>> - - const: pixel
>>> - - const: pll
>>> - - const: bclk
>>> - - const: spdif
>>> + minItems: 4
>>> + maxItems: 4
>>> +
>>> + interrupts:
>>> + maxItems: 1
>>>
>>> phys:
>>> maxItems: 1
>>> @@ -58,6 +53,9 @@ properties:
>>> description: |
>>> phandle link and register offset to the system configuration registers.
>>>
>>> + power-domains:
>>> + maxItems: 1
>>> +
>>> ports:
>>> $ref: /schemas/graph.yaml#/properties/ports
>>>
>>> @@ -86,9 +84,50 @@ required:
>>> - clock-names
>>> - phys
>>> - phy-names
>>> - - mediatek,syscon-hdmi
>>> - ports
>>>
>>> +allOf:
>>> + - if:
>>> + properties:
>>> + compatible:
>>> + contains:
>>> + const: mediatek,mt8195-hdmi
>>> + then:
>>> + properties:
>>> + clocks:
>>> + items:
>>> + - description: APB
>>> + - description: HDCP
>>> + - description: HDCP 24M
>>> + - description: Split HDMI
>>> + clock-names:
>>> + items:
>>> + - const: hdmi_apb_sel
>>> + - const: hdcp_sel
>>> + - const: hdcp24_sel
>>> + - const: split_hdmi
>>> +
>>> + required:
>>> + - power-domains
>>> + else:
>>> + properties:
>>> + clocks:
>>> + items:
>>> + - description: Pixel Clock
>>> + - description: HDMI PLL
>>> + - description: Bit Clock
>>> + - description: S/PDIF Clock
>>> +
>>> + clock-names:
>>> + items:
>>> + - const: pixel
>>> + - const: pll
>>> + - const: bclk
>>> + - const: spdif
>>> +
>>> + required:
>>> + - mediatek,syscon-hdmi
>>> +
>>> additionalProperties: false
>>>
>>> examples:
>>> diff --git a/Documentation/devicetree/bindings/display/mediatek/mediatek,mt8195-hdmi-ddc.yaml b/Documentation/devicetree/bindings/display/mediatek/mediatek,mt8195-hdmi-ddc.yaml
>>> new file mode 100644
>>> index 000000000000..0fe0a2a2f17f
>>> --- /dev/null
>>> +++ b/Documentation/devicetree/bindings/display/mediatek/mediatek,mt8195-hdmi-ddc.yaml
>>> @@ -0,0 +1,51 @@
>>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>>> +%YAML 1.2
>>> +---
>>> +$id: http://devicetree.org/schemas/display/mediatek/mediatek,mt8195-hdmi-ddc.yaml#
>>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>>> +
>>> +title: Mediatek HDMI DDC for mt8195
>>> +
>>> +maintainers:
>>> + - CK Hu <ck.hu@...iatek.com>
>>> + - Jitao shi <jitao.shi@...iatek.com>
>>> +
>>> +description: |
>>> + The HDMI DDC i2c controller is used to interface with the HDMI DDC pins.
>>> +
>>> +properties:
>>> + compatible:
>>> + enum:
>>> + - mediatek,mt8195-hdmi-ddc
>>
>> I think I wrote it - you already have bindings for HDMI DDC. I doubt
>> that these are different and it looks like you model the bindings
>> according to your driver. That's not the way.
>
> Hi Krzysztof,
>
> I've made a separate binding as this new IP is integrated into the
> HDMI hw block.
> The difference it makes is that the hw is slightly simpler to describe
> as the IP doesn't
> have it's own range of registers or an interrupt line.
>
> I can use the "legacy mediatek mtk ddc binding" if I modify it to have
> the reg and
> interrupt properties not being required for mt8195.
OK, it is reasonable - such stuff should be in commit msg, so we won't
keep asking.
>
> Would that work better for you?
>
>>
>>> +
>>> + clocks:
>>> + maxItems: 1
>>> +
>>> + clock-names:
>>> + items:
>>> + - const: ddc
>>> +
>>> + mediatek,hdmi:
>>> + $ref: /schemas/types.yaml#/definitions/phandle
>>> + description:
>>> + A phandle to the mt8195 hdmi controller
>>> +
>>> +required:
>>> + - compatible
>>> + - clocks
>>> + - clock-names
>>> +
>>> +additionalProperties: false
>>> +
>>> +examples:
>>> + - |
>>> + #include <dt-bindings/interrupt-controller/arm-gic.h>
>>> + #include <dt-bindings/interrupt-controller/irq.h>
>>> + hdmiddc0: ddc_i2c {
>>
>> Node names should be generic - ddc.
>> https://devicetree-specification.readthedocs.io/en/latest/chapter2-devicetree-basics.html#generic-names-recommendation
>>
>> No underscores in node names.
>>
>> Additionally I2C devices have addresses on the bus. Why this one doesn't?
>>
>
> This is an i2c adapter, not a device.
> And as it lives inside the HDMI hw block, I've omitted using an address here.
>
> Is this valid? or should this be expressed differently?
What is an I2C adapter? Did you mean I2C controller (master)?
Best regards,
Krzysztof
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