Received-SPF: pass (google.com: domain of linux-kernel+bounces-180949-linux.lists.archive=gmail.com@vger.kernel.org designates 147.75.199.223 as permitted sender) client-ip=147.75.199.223;
Message-ID: <b354724f-5235-4519-8361-b8209ab99d36@pengutronix.de>
Date: Thu, 16 May 2024 13:36:00 +0200
Precedence: bulk
MIME-Version: 1.0
User-Agent: Mozilla Thunderbird
Subject: Re: [PATCH] arm64: dts: imx8mp: Enable HDMI on i.MX8MP DHCOM PDK2 and
 PDK3
To: Marek Vasut <marex@denx.de>, Francesco Dolcini <francesco@dolcini.it>
Cc: Rob Herring <robh@kernel.org>, Conor Dooley <conor+dt@kernel.org>,
 devicetree@vger.kernel.org, Shawn Guo <shawnguo@kernel.org>,
 Sascha Hauer <s.hauer@pengutronix.de>, linux-kernel@vger.kernel.org,
 imx@lists.linux.dev, kernel@dh-electronics.com,
 Pengutronix Kernel Team <kernel@pengutronix.de>,
 Krzysztof Kozlowski <krzk+dt@kernel.org>, Fabio Estevam
 <festevam@gmail.com>, linux-arm-kernel@lists.infradead.org
References: <20240514010706.245874-1-marex@denx.de>
 <20240516080008.GA9338@francesco-nb>
 <76b3cee8-1fe3-4192-b8c9-7a9c2b7165f0@denx.de>
Content-Language: en-US
From: Ahmad Fatoum <a.fatoum@pengutronix.de>
In-Reply-To: <76b3cee8-1fe3-4192-b8c9-7a9c2b7165f0@denx.de>
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 7bit

Hello Marek,

On 16.05.24 13:14, Marek Vasut wrote:
> On 5/16/24 10:00 AM, Francesco Dolcini wrote:
>> Hello Marek,
> 
> Hi,
> 
>> On Tue, May 14, 2024 at 03:06:42AM +0200, Marek Vasut wrote:
>>> Enable HDMI output on i.MX8MP DHCOM PDK2 and PDK3. The I2C5 on PDK2 and
>>> I2C mux port 1 on PDK3 respectively are used in regular I2C mode instead
>>> of HDMI DDC mode to permit connection of other I2C devices on those buses.
>>
>> Are you able to read the HDMI EDID with such configuration? I have the
>> patch ready for verdin imx8mp, I just did not have time to figure out
>> this last details.
> 
> Yes with ddc-i2c-bus in hdmi_tx{} node, no with ddc-i2c-bus in connector node. Maybe that's what you're running into ? The DW HDMI core needs the ddc-i2c-bus property in hdmi_tx{} node if you use non-native I2C bus for the DDC channel.

What benefit does the hdmi-connector provide over just omitting it?
Just for documentation purposes?

Thanks,
Ahmad


> 
> 

-- 
Pengutronix e.K.                           |                             |
Steuerwalder Str. 21                       | http://www.pengutronix.de/  |
31137 Hildesheim, Germany                  | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |