linux-kernel - Re: [PATCH 3/5] arm64: dts: mt7622: add a property "mediatek,num-pwms" for PWM

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Message-ID: <2edcc5fd-ce60-b585-e0fd-226897a7a34c@gmail.com>
Date:   Thu, 17 Jan 2019 14:00:43 +0100
From:   Matthias Brugger <matthias.bgg@...il.com>
To:     Uwe Kleine-König <u.kleine-koenig@...gutronix.de>,
        Ryder Lee <ryder.lee@...iatek.com>
Cc:     Thierry Reding <thierry.reding@...il.com>,
        Sean Wang <sean.wang@...nel.org>,
        Weijie Gao <weijie.gao@...iatek.com>,
        linux-pwm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH 3/5] arm64: dts: mt7622: add a property
 "mediatek,num-pwms" for PWM



On 15/01/2019 21:02, Uwe Kleine-König wrote:
> Hello,
> 
> On Mon, Jan 14, 2019 at 04:21:22PM +0800, Ryder Lee wrote:
>> This adds a property "mediatek,num-pwms" for PWM controller.
>>
>> Signed-off-by: Ryder Lee <ryder.lee@...iatek.com>
>> ---
>>  arch/arm64/boot/dts/mediatek/mt7622.dtsi | 1 +
>>  1 file changed, 1 insertion(+)
>>
>> diff --git a/arch/arm64/boot/dts/mediatek/mt7622.dtsi b/arch/arm64/boot/dts/mediatek/mt7622.dtsi
>> index 8fc4aa7..ab016cf 100644
>> --- a/arch/arm64/boot/dts/mediatek/mt7622.dtsi
>> +++ b/arch/arm64/boot/dts/mediatek/mt7622.dtsi
>> @@ -436,6 +436,7 @@
>>  			 <&pericfg CLK_PERI_PWM6_PD>;
>>  		clock-names = "top", "main", "pwm1", "pwm2", "pwm3", "pwm4",
>>  			      "pwm5", "pwm6";
>> +		mediatek,num-pwms = <6>;
>>  		status = "disabled";
> 
> Conceptually this patch must go in before the change to the driver.
> Otherwise the pwms are not usable with only patch 1 applied which breaks
> bisectability.
> 

The driver should have backwards compatibility to older DTs. So that would need
to be fixed in the driver not in the patch order of the series.

Regards,
Matthias