linux-kernel - Re: [PATCH V5 2/4] arm64: dts: qcom: sc7180: Add necessary pinctrl and interrupt config for BT UART

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Date:   Fri, 11 Sep 2020 10:15:04 +0000
From:   skakit@...eaurora.org
To:     Doug Anderson <dianders@...omium.org>
Cc:     Bjorn Andersson <bjorn.andersson@...aro.org>,
        Matthias Kaehlcke <mka@...omium.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andy Gross <agross@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>,
        Akash Asthana <akashast@...eaurora.org>,
        Roja Rani Yarubandi <rojay@...eaurora.org>,
        msavaliy@....qualcomm.com
Subject: Re: [PATCH V5 2/4] arm64: dts: qcom: sc7180: Add necessary pinctrl
 and interrupt config for BT UART

On 2020-09-10 20:10, Doug Anderson wrote:
> Hi,
> 
> On Thu, Sep 10, 2020 at 5:55 AM satya priya <skakit@...eaurora.org> 
> wrote:
>> 
>> Add a suitable sleep configuration for uart3 to support Bluetooth 
>> wakeup.
>> 
>> If QUP function is selected in sleep state, UART RTS/RFR is pulled 
>> high
>> during suspend and BT SoC not able to send wakeup bytes. So, configure
>> GPIO mode in sleep state to keep it low during suspend.
>> 
>> Signed-off-by: satya priya <skakit@...eaurora.org>
>> Reviewed-by: Akash Asthana <akashast@...eaurora.org>
>> ---
>> Changes in V2:
>>  - This patch adds sleep state for BT UART. Newly added in V2.
>> 
>> Changes in V3:
>>  - Remove "output-high" for TX from both sleep and default states
>>    as it is not required. Configure pull-up for TX in sleep state.
>> 
>> Changes in V4:
>>  - As per Matthias's comment, removed drive-strength for sleep state
>>    and fixed nit-pick.
>> 
>> Changes in V5:
>>  - As per Matthias's comments, moved pinmux change for sleep state,
>>    pinctrl and interrupt config to the board specific file.
>> 
>>  arch/arm64/boot/dts/qcom/sc7180-idp.dts | 48 
>> +++++++++++++++++++++++++++++++++
>>  1 file changed, 48 insertions(+)
> 
> Similar comment to patch #1 in that this applies only to the IDP board
> but that's not obvious from ${SUBJECT}
> 

Okay.

> 
>> diff --git a/arch/arm64/boot/dts/qcom/sc7180-idp.dts 
>> b/arch/arm64/boot/dts/qcom/sc7180-idp.dts
>> index 04888df..e529a41 100644
>> --- a/arch/arm64/boot/dts/qcom/sc7180-idp.dts
>> +++ b/arch/arm64/boot/dts/qcom/sc7180-idp.dts
>> @@ -344,6 +344,10 @@
>>  };
>> 
>>  &uart3 {
>> +       pinctrl-names = "default", "sleep";
>> +       pinctrl-1 = <&qup_uart3_sleep>;
>> +       interrupts-extended = <&intc GIC_SPI 604 IRQ_TYPE_LEVEL_HIGH>,
>> +                               <&tlmm 41 IRQ_TYPE_EDGE_FALLING>;
> 
> You need a:
> 
> /delete-property/interrupts;
> 
> ...or, alternatively, a patch before this one that converts all the
> UARTs in sc7180 to just use interrupts-extended.
> 

Sure, I will add this. But I think when both are added, 
"interrupts-extended" will get priority as per [1] and there wouldn't be 
any problem.

[1] 
https://www.kernel.org/doc/Documentation/devicetree/bindings/interrupt-controller/interrupts.txt

> 
>>         status = "okay";
> 
> Slight nit is that usually I see the status line first.  All the other
> instances in this file have it that way.  Can you match?
> 

Ok, will correct it.

> 
> 
> 
> -Doug