linux-kernel - Re: [PATCH v8 18/21] soc/tegra: pmc: Configure core power request polarity

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Message-ID: <29842147-a5f8-d51d-c594-b93b20b2e20f@gmail.com>
Date:   Fri, 9 Aug 2019 16:13:20 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Sowjanya Komatineni <skomatineni@...dia.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, rjw@...ysocki.net,
        viresh.kumar@...aro.org, linux-pm@...r.kernel.org
Subject: Re: [PATCH v8 18/21] soc/tegra: pmc: Configure core power request
 polarity

09.08.2019 2:46, Sowjanya Komatineni пишет:
> This patch configures polarity of the core power request signal
> in PMC control register based on the device tree property.
> 
> PMC asserts and de-asserts power request signal based on it polarity
> when it need to power-up and power-down the core rail during SC7.
> 
> Signed-off-by: Sowjanya Komatineni <skomatineni@...dia.com>
> ---
>  drivers/soc/tegra/pmc.c | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/drivers/soc/tegra/pmc.c b/drivers/soc/tegra/pmc.c
> index 3aa71c28a10a..e013ada7e4e9 100644
> --- a/drivers/soc/tegra/pmc.c
> +++ b/drivers/soc/tegra/pmc.c
> @@ -56,6 +56,7 @@
>  #define  PMC_CNTRL_SIDE_EFFECT_LP0	BIT(14) /* LP0 when CPU pwr gated */
>  #define  PMC_CNTRL_SYSCLK_OE		BIT(11) /* system clock enable */
>  #define  PMC_CNTRL_SYSCLK_POLARITY	BIT(10) /* sys clk polarity */
> +#define  PMC_CNTRL_PWRREQ_POLARITY	BIT(8)
>  #define  PMC_CNTRL_MAIN_RST		BIT(4)
>  
>  #define PMC_WAKE_MASK			0x0c
> @@ -2290,6 +2291,11 @@ static void tegra20_pmc_init(struct tegra_pmc *pmc)
>  	else
>  		value |= PMC_CNTRL_SYSCLK_POLARITY;
>  
> +	if (pmc->corereq_high)
> +		value &= ~PMC_CNTRL_PWRREQ_POLARITY;
> +	else
> +		value |= PMC_CNTRL_PWRREQ_POLARITY;
> +
>  	/* configure the output polarity while the request is tristated */
>  	tegra_pmc_writel(pmc, value, PMC_CNTRL);
>  
> 

Reviewed-by: Dmitry Osipenko <digetx@...il.com>