linux-kernel - Re: [PATCH 7/7] arm64: dts: ti: k3-am68-sk: Enable DSI on DisplayPort-0

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Message-ID: <cdeb1f80-a959-423d-9cba-dc1af760fe75@ti.com>
Date: Mon, 21 Apr 2025 16:40:46 +0530
From: Jayesh Choudhary <j-choudhary@...com>
To: "Kumar, Udit" <u-kumar1@...com>, <nm@...com>, <vigneshr@...com>,
        <devarsht@...com>, <linux-kernel@...r.kernel.org>
CC: <robh@...nel.org>, <krzk+dt@...nel.org>, <conor+dt@...nel.org>,
        <kristo@...nel.org>, <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 7/7] arm64: dts: ti: k3-am68-sk: Enable DSI on
 DisplayPort-0

Hello Udit,

On 19/04/25 15:04, Kumar, Udit wrote:
> 
> On 4/11/2025 4:21 PM, Jayesh Choudhary wrote:
>> Enable DSI support for AM68-SK platform.
>>
>> Add DT node for DSI2eDP bridge. The DSI to eDP bridge is sn65dsi86
>> on the board.
>>
>> Add the endpoint nodes to describe connection from:
>> DSS => DSI => SN65DSI86 bridge => DisplayPort-0
>>
>> Set status for all required nodes for DisplayPort-0 as 'okay'.
>>
>> Signed-off-by: Jayesh Choudhary <j-choudhary@...com>
>> ---
>>   .../boot/dts/ti/k3-am68-sk-base-board.dts     | 96 +++++++++++++++++++
>>   1 file changed, 96 insertions(+)
>>
>> diff --git a/arch/arm64/boot/dts/ti/k3-am68-sk-base-board.dts 
>> b/arch/arm64/boot/dts/ti/k3-am68-sk-base-board.dts
>> index 11522b36e0ce..df54de2d8236 100644
>> --- a/arch/arm64/boot/dts/ti/k3-am68-sk-base-board.dts
>> +++ b/arch/arm64/boot/dts/ti/k3-am68-sk-base-board.dts
>> @@ -124,6 +124,35 @@ transceiver4: can-phy3 {
>>           max-bitrate = <5000000>;
>>       };
>> +    edp0_refclk: clock-edp0-refclk {
>> +        #clock-cells = <0>;
>> +        compatible = "fixed-clock";
>> +        clock-frequency = <19200000>;
>> +    };
> 
> I assume on this board and through out series, display is DP not eDP.
> 
> do you see possibility to change wording from eDP to DP
> 

Yes, the display is DP.
But this is the refclk consumed by SN65DSI86 bridge (DSI-to-eDP bridge)
Hence the naming.

> 
>> +
>> +    dp0_pwr_3v3: fixedregulator-dp0-pwr {
>> +        compatible = "regulator-fixed";
>> +        regulator-name = "dp0-pwr";
>> +        regulator-min-microvolt = <3300000>;
>> +        regulator-max-microvolt = <3300000>;
>> +        gpio = <&exp2 2 GPIO_ACTIVE_HIGH>;     /*P0 - DP0_3V3 _EN */
>> +        enable-active-high;
>> +        regulator-always-on;
>> +    };
>> +
>> [..]

Thanks,
Jayesh