linux-kernel - Re: [PATCH 08/14] ARM64: dts: hisilicon: Add tsensor interrupt name

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Message-ID: <615bc0a7-161d-76de-e798-7ce779f49a75@linaro.org>
Date:   Tue, 16 Oct 2018 17:12:50 +0200
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     Rob Herring <robh@...nel.org>
Cc:     Eduardo Valentin <edubezval@...il.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "open list:THERMAL" <linux-pm@...r.kernel.org>,
        Leo Yan <leo.yan@...aro.org>, Zhang Rui <rui.zhang@...el.com>,
        Mark Rutland <mark.rutland@....com>,
        Wei Xu <xuwei5@...ilicon.com>, devicetree@...r.kernel.org,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 08/14] ARM64: dts: hisilicon: Add tsensor interrupt name

On 16/10/2018 16:44, Rob Herring wrote:
> On Mon, Oct 15, 2018 at 1:01 PM Daniel Lezcano
> <daniel.lezcano@...aro.org> wrote:
>>
>>
>> Hi Rob,
>>
>> thanks for the review.
>>
>> On 15/10/2018 18:28, Rob Herring wrote:
>>> On Tue, Sep 25, 2018 at 11:03:06AM +0200, Daniel Lezcano wrote:
>>>> Add the interrupt names for the sensors, so the code can rely on them
>>>> instead of dealing with index which are prone to error.
> 
> [...]
> 
>>>> +            interrupt-names = "tsensor_intr";
>>>
>>> That name seems pretty pointless.
>>>
>>>>              clocks = <&sys_ctrl HI6220_TSENSOR_CLK>;
>>>>              clock-names = "thermal_clk";
>>>>              #thermal-sensor-cells = <1>;
>>>> @@ -28,5 +30,6 @@ for Hi3660:
>>>>              compatible = "hisilicon,hi3660-tsensor";
>>>>              reg = <0x0 0xfff30000 0x0 0x1000>;
>>>>              interrupts = <GIC_SPI 145 IRQ_TYPE_LEVEL_HIGH>;
>>>> +            interrupt-names = "tsensor_a73";
>>>
>>> Just 'a73' is sufficient.
>>
>> This is the name defined in the board documentation to give a name to
>> the interrupt when requesting it. This one appears in /proc/interrupts.
>>
>> I can replace the 'tsensor_intr' by 'tsensor', but if 'tsensor_a73' is
>> replaced by 'a73' that may looks odd in /proc/interrupts to see an
>> interrupts line with the 'a73' name.
> 
> Sounds like a Linux problem, not DT...
> 
> The thing is that any *-names property is supposed to be a local to
> block name. For example, a UART may have a TX irq. It's local name is
> just "TX IRQ", but then upstream at the interrupt controller it may be
> "UART1 TX IRQ". If you have multiple instances, the local names are
> the same.
> 
> If we lose the node name from /proc/interrupts when interrupt-names is
> used, then we should fix that.

Ah, ok. It makes more sense for me now. Thanks for the explanation, .


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