linux-kernel - Re: [PATCH v7 16/20] arm64: tegra: Enable wake from deep sleep on RTC alarm

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Date:   Wed, 31 Jul 2019 14:08:38 -0700
From:   Sowjanya Komatineni <skomatineni@...dia.com>
To:     Dmitry Osipenko <digetx@...il.com>, <thierry.reding@...il.com>,
        <jonathanh@...dia.com>, <tglx@...utronix.de>,
        <jason@...edaemon.net>, <marc.zyngier@....com>,
        <linus.walleij@...aro.org>, <stefan@...er.ch>,
        <mark.rutland@....com>
CC:     <pdeschrijver@...dia.com>, <pgaikwad@...dia.com>,
        <sboyd@...nel.org>, <linux-clk@...r.kernel.org>,
        <linux-gpio@...r.kernel.org>, <jckuo@...dia.com>,
        <josephl@...dia.com>, <talho@...dia.com>,
        <linux-tegra@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <mperttunen@...dia.com>, <spatra@...dia.com>, <robh+dt@...nel.org>,
        <devicetree@...r.kernel.org>
Subject: Re: [PATCH v7 16/20] arm64: tegra: Enable wake from deep sleep on RTC
 alarm


On 7/31/19 4:04 AM, Dmitry Osipenko wrote:
> 31.07.2019 3:20, Sowjanya Komatineni пишет:
>> This patch updates device tree for RTC and PMC to allow system wake
>> from deep sleep on RTC alarm.
>>
>> Signed-off-by: Sowjanya Komatineni <skomatineni@...dia.com>
>> ---
>>   arch/arm64/boot/dts/nvidia/tegra210.dtsi | 5 ++++-
>>   1 file changed, 4 insertions(+), 1 deletion(-)
>>
>> diff --git a/arch/arm64/boot/dts/nvidia/tegra210.dtsi b/arch/arm64/boot/dts/nvidia/tegra210.dtsi
>> index 659753118e96..30a7c48385a2 100644
>> --- a/arch/arm64/boot/dts/nvidia/tegra210.dtsi
>> +++ b/arch/arm64/boot/dts/nvidia/tegra210.dtsi
>> @@ -768,7 +768,8 @@
>>   	rtc@...0e000 {
>>   		compatible = "nvidia,tegra210-rtc", "nvidia,tegra20-rtc";
>>   		reg = <0x0 0x7000e000 0x0 0x100>;
>> -		interrupts = <GIC_SPI 2 IRQ_TYPE_LEVEL_HIGH>;
>> +		interrupts = <16 IRQ_TYPE_LEVEL_HIGH>;
>> +		interrupt-parent = <&pmc>;
>>   		clocks = <&tegra_car TEGRA210_CLK_RTC>;
>>   		clock-names = "rtc";
>>   	};
>> @@ -778,6 +779,8 @@
>>   		reg = <0x0 0x7000e400 0x0 0x400>;
>>   		clocks = <&tegra_car TEGRA210_CLK_PCLK>, <&clk32k_in>;
>>   		clock-names = "pclk", "clk32k_in";
>> +		#interrupt-cells = <2>;
>> +		interrupt-controller;
>>   
>>   		powergates {
>>   			pd_audio: aud {
>>
> Is this a backwards-compatible change? Or it's not really worth to care
> about the compatibility with older kernel versions, I'm not sure about
> overall state of T210 in the upstream kernel.
I don't think its required to be backwards-compatible as SC7 entry/exit 
implementation for T210 is with this patch series onwards..