linux-kernel - Re: [PATCH 2/5] arm64: dts: qcom: qrb4210-rb2: Enable display out

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Message-ID: <b0cf5634-60e4-adba-92df-73f05451cd9f@linaro.org>
Date:   Mon, 15 May 2023 19:00:17 +0200
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Caleb Connolly <caleb.connolly@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Bhupesh Sharma <bhupesh.sharma@...aro.org>
Cc:     Marijn Suijten <marijn.suijten@...ainline.org>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/5] arm64: dts: qcom: qrb4210-rb2: Enable display out



On 15.05.2023 17:57, Caleb Connolly wrote:
> 
> 
> On 15/05/2023 13:04, Konrad Dybcio wrote:
>> The RB2 has a HDMI output via an LT9611UXC bridge. Set it up.
>>
>> Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>
>> ---
>>  arch/arm64/boot/dts/qcom/qrb4210-rb2.dts | 88 +++++++++++++++++++++++++++++++-
>>  1 file changed, 87 insertions(+), 1 deletion(-)
>>
>> diff --git a/arch/arm64/boot/dts/qcom/qrb4210-rb2.dts b/arch/arm64/boot/dts/qcom/qrb4210-rb2.dts
>> index 80c6b59c8ff6..9b539720f05d 100644
>> --- a/arch/arm64/boot/dts/qcom/qrb4210-rb2.dts
>> +++ b/arch/arm64/boot/dts/qcom/qrb4210-rb2.dts
> 
> [...]
>> @@ -312,11 +385,24 @@ &sleep_clk {
>>  };
>>  
>>  &tlmm {
>> -	gpio-reserved-ranges = <37 5>, <43 2>, <47 1>,
>> +	gpio-reserved-ranges = <43 2>, <47 1>,
> 
> Is this intentional?
Yes, notice how this included the reset pin. These pins are
not even really reserved, there's no FPC on this board..

Konrad
>>  			       <49 1>, <52 1>, <54 1>,
>>  			       <56 3>, <61 2>, <64 1>,
>>  			       <68 1>, <72 8>, <96 1>;
>>  
>> +	lt9611_rst_pin: lt9611-rst-state {
>> +		pins = "gpio41";
>> +		function = "gpio";
>> +		input-disable;
>> +		output-high;
>> +	};
>> +
>> +	lt9611_irq_pin: lt9611-irq-state {
>> +		pins = "gpio46";
>> +		function = "gpio";
>> +		bias-disable;
>> +	};
>> +
>>  	sdc2_card_det_n: sd-card-det-n-state {
>>  		pins = "gpio88";
>>  		function = "gpio";
>>
>