linux-kernel - Re: [PATCH V1 08/10] thermal: tegra: add PM support

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Message-ID: <20160113155540.GH2588@ulmo>
Date:	Wed, 13 Jan 2016 16:55:40 +0100
From:	Thierry Reding <thierry.reding@...il.com>
To:	Wei Ni <wni@...dia.com>
Cc:	rui.zhang@...el.com, mikko.perttunen@...si.fi,
	swarren@...dotorg.org, linux-tegra@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH V1 08/10] thermal: tegra: add PM support

On Wed, Jan 13, 2016 at 04:00:43PM +0800, Wei Ni wrote:
> Add suspend/resume function in soctherm driver.
> And enable it for Tegra124 and Tegra210.
> 
> Signed-off-by: Wei Ni <wni@...dia.com>
> ---
>  drivers/thermal/tegra/tegra124_soctherm.c |   9 ++
>  drivers/thermal/tegra/tegra210_soctherm.c |   9 ++
>  drivers/thermal/tegra/tegra_soctherm.c    | 154 +++++++++++++++++++++---------
>  drivers/thermal/tegra/tegra_soctherm.h    |   5 +
>  4 files changed, 130 insertions(+), 47 deletions(-)

This all looks like it'd be a better candidate for runtime PM. The
implementation would be mostly the same, except that you'd need to
add a few more things to tegra_soctherm_probe() and use the runtime
PM API to enable/disable the device (clocks, resets, ...). System
sleep should then be taken care of automatically.

Another comment irrespective of that...

> diff --git a/drivers/thermal/tegra/tegra124_soctherm.c b/drivers/thermal/tegra/tegra124_soctherm.c
> index 13d7f4e3a3d7..04cb419dbabc 100644
> --- a/drivers/thermal/tegra/tegra124_soctherm.c
> +++ b/drivers/thermal/tegra/tegra124_soctherm.c
> @@ -205,6 +205,14 @@ static const struct of_device_id tegra124_soctherm_of_match[] = {
>  };
>  MODULE_DEVICE_TABLE(of, tegra_soctherm_of_match);
>  
> +#ifdef CONFIG_PM_SLEEP
> +static SIMPLE_DEV_PM_OPS(tegra124_soctherm_pm,
> +			 soctherm_suspend, soctherm_resume);
> +#define TEGRA124_SOC_THERM_PM      (&tegra124_soctherm_pm)
> +#else
> +#define TEGRA124_SOC_THERM_PM      NULL
> +#endif

I wouldn't bother with the #ifdef, just always define the structure.

Thierry

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