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Wed, 4 Dec 2024 16:01:58 +0100 (CET) Message-ID: <272b76ed-0ccc-46f2-8c43-92c047f2f0d3@collabora.com> Date: Wed, 4 Dec 2024 16:01:57 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v1 2/7] dt-bindings: display: mediatek: Add binding for MT8195 HDMI-TX v2 To: =?UTF-8?B?Q0sgSHUgKOiDoeS/iuWFiSk=?= , "chunkuang.hu@kernel.org" Cc: "linux-kernel@vger.kernel.org" , "linux-mediatek@lists.infradead.org" , "devicetree@vger.kernel.org" , "simona@ffwll.ch" , "kernel@collabora.com" , "tzimmermann@suse.de" , "mripard@kernel.org" , "p.zabel@pengutronix.de" , "maarten.lankhorst@linux.intel.com" , "conor+dt@kernel.org" , "robh@kernel.org" , "dri-devel@lists.freedesktop.org" , "airlied@gmail.com" , "linux-arm-kernel@lists.infradead.org" , "matthias.bgg@gmail.com" , "krzk+dt@kernel.org" References: <20241120124512.134278-1-angelogioacchino.delregno@collabora.com> <20241120124512.134278-3-angelogioacchino.delregno@collabora.com> <721896498fe9a5ba5a942fe837deb90d461b5090.camel@mediatek.com> <3d5f7106-6425-420c-abac-39feed11c95c@collabora.com> <4b1eb13d027717abaaaf4ee7aa927239ba314572.camel@mediatek.com> From: AngeloGioacchino Del Regno Content-Language: en-US In-Reply-To: <4b1eb13d027717abaaaf4ee7aa927239ba314572.camel@mediatek.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20241204_070202_864885_1522ADB5 X-CRM114-Status: GOOD ( 31.45 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Il 29/11/24 03:51, CK Hu (胡俊光) ha scritto: > On Thu, 2024-11-28 at 11:32 +0100, AngeloGioacchino Del Regno wrote: >> External email : Please do not click links or open attachments until you have verified the sender or the content. >> >> >> Il 28/11/24 07:02, CK Hu (胡俊光) ha scritto: >>> Hi, Angelo: >>> >>> On Wed, 2024-11-20 at 13:45 +0100, AngeloGioacchino Del Regno wrote: >>>> External email : Please do not click links or open attachments until you have verified the sender or the content. >>>> >>>> >>>> Add a binding for the HDMI TX v2 Encoder found in MediaTek MT8195 >>>> and MT8188 SoCs. >>>> >>>> This fully supports the HDMI Specification 2.0b, hence it provides >>>> support for 3D-HDMI, Polarity inversion, up to 16 bits Deep Color, >>>> color spaces including RGB444, YCBCR420/422/444 (ITU601/ITU709) and >>>> xvYCC, with output resolutions up to 3840x2160p@60Hz. >>>> >>>> Moreover, it also supports HDCP 1.4 and 2.3, Variable Refresh Rate >>>> (VRR) and Consumer Electronics Control (CEC). >>>> >>>> This IP also includes support for HDMI Audio, including IEC60958 >>>> and IEC61937 SPDIF, 8-channel PCM, DSD, and other lossless audio >>>> according to HDMI 2.0. >>>> >>>> Signed-off-by: AngeloGioacchino Del Regno >>>> --- >>>> .../mediatek/mediatek,mt8195-hdmi.yaml | 150 ++++++++++++++++++ >>>> 1 file changed, 150 insertions(+) >>>> create mode 100644 Documentation/devicetree/bindings/display/mediatek/mediatek,mt8195-hdmi.yaml >>>> >>>> diff --git a/Documentation/devicetree/bindings/display/mediatek/mediatek,mt8195-hdmi.yaml b/Documentation/devicetree/bindings/display/mediatek/mediatek,mt8195-hdmi.yaml >>>> new file mode 100644 >>>> index 000000000000..273a8871461e >>>> --- /dev/null >>>> +++ b/Documentation/devicetree/bindings/display/mediatek/mediatek,mt8195-hdmi.yaml >>>> @@ -0,0 +1,150 @@ >>>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) >>>> +%YAML 1.2 >>>> +--- >>>> +$id: https://urldefense.com/v3/__http://devicetree.org/schemas/display/mediatek/mediatek,mt8195-hdmi.yaml*__;Iw!!CTRNKA9wMg0ARbw!lu0D_C3TwQ2-02jWYABnMIQ8vEoUwP0O4gbQndJnPUMpdi6wXdAHra9ivCfB7zoelDI7qsS20YdRlmP4bEKAABletXFX$ >>>> +$schema: https://urldefense.com/v3/__http://devicetree.org/meta-schemas/core.yaml*__;Iw!!CTRNKA9wMg0ARbw!lu0D_C3TwQ2-02jWYABnMIQ8vEoUwP0O4gbQndJnPUMpdi6wXdAHra9ivCfB7zoelDI7qsS20YdRlmP4bEKAAFlnY-KY$ >>>> + >>>> +title: MediaTek HDMI-TX v2 Encoder >>>> + >>>> +maintainers: >>>> + - AngeloGioacchino Del Regno >>>> + - CK Hu >>>> + >>>> +description: | >>>> + The MediaTek HDMI-TX v2 encoder can generate HDMI format data based on >>>> + the HDMI Specification 2.0b. >>>> + >>>> +properties: >>>> + compatible: >>>> + enum: >>>> + - mediatek,mt8188-hdmi-tx >>>> + - mediatek,mt8195-hdmi-tx >>>> + >>>> + reg: >>>> + maxItems: 1 >>>> + >>>> + interrupts: >>>> + maxItems: 1 >>>> + >>>> + clocks: >>>> + items: >>>> + - description: HDMI APB clock >>>> + - description: HDCP top clock >>>> + - description: HDCP reference clock >>>> + - description: VPP HDMI Split clock >>> >>> I would like to know more about HDMI v2. >>> Would you map each v2 clock to v1 clock? >>> If one clock has no mapping, is it a new feature that v1 does not has? >>> >> >> The HDMIv2 HW block seems to be almost completely different from the v1, and >> it is also interconnected in a different way compared to MT8173 (the path goes >> through VPP1, while the v1 is just direct to DPI/MMSYS). >> >> The v1 block had specific clocks for the audio (i2s, I believe) and for the SPDIF, >> and I have no idea how v1 does HDCP, but I don't see any specific clock for that. >> >> The v2 block is clocked from the HDCP clock, the (apb) bus has its own clock, and >> the video out needs the vpp split clock. >> >> It's just different, and we can't shove the v2 binding inside of the v1 one, but >> even if we could, since the v2 block is *that much* different from v1, it'd be a >> mistake to do so. >> >> Since the binding describes hardware, and since this v2 HW is *very* different >> from v1, it needs a new binding document, that is true even if you find a way to >> get the clocks to match (which is not possible, anyway). > Hey. Sorry about the late reply, it's been quite busy days here :-) > v2 indeed is very different from v1, so it's not necessary to merge binding document. > I would like to have more information about the difference in binding document, > so that we could clearly understand that v1 and v2 are so different. > Sounds reasonable. > I think pixel clock is important for HDMI hardware, but I do not see it in HDMI v2. > It is better has some documentation about why pixel clock disappear in HDMI v2. Right. I'll write it in the PHY description. phys: maxItems: 1 description: The HDMI TX PHY, clocking TMDS and pixel to this controller > > I've some 'WHY' about v2. > Why no audio clock in v2? It's clocked by the HDCP CGs... > Audio control part is moved out of HDMI block? > > For HDCP, maybe v1 driver has not implement it so forget to add it in binding document. > So just skip the HDCP. ...and the controller needs HDCP clocks for register access, so these are main clocks and cannot be skipped. > > The four clock in v2 does not exist in v1, so what is the function of each one? > If possible, ask MediaTek staff for more information. I'll try to ask to shove more information in this binding, let's see. Cheers, Angelo > > Regards, > CK > >> >> Cheers, >> Angelo >> >>> Regards, >>> CK >>> >>>> + >>>> + clock-names: >>>> + items: >>>> + - const: bus >>>> + - const: hdcp >>>> + - const: hdcp24m >>>> + - const: hdmi-split >>>> + >>>> >>>> -- >>>> 2.47.0 >>>> >> >>