linux-kernel - Re: [PATCH v4 3/3] regulator: bd9571mwv: Document "backup

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Date:   Tue, 17 Jul 2018 13:53:06 +0200
From:   Niklas Söderlund 
        <niklas.soderlund@...natech.se>
To:     Geert Uytterhoeven <geert+renesas@...der.be>
Cc:     Marek Vasut <marek.vasut+renesas@...il.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Pavel Machek <pavel@....cz>, Len Brown <len.brown@...el.com>,
        linux-pm@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 3/3] regulator: bd9571mwv: Document "backup_mode"
 sysfs file

Hi Geert,

Thanks for your work.

On 2018-07-16 17:30:52 +0200, Geert Uytterhoeven wrote:
> Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
> Acked-by: Pavel Machek <pavel@....cz>

Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@...natech.se>

> ---
> v4:
>   - Add Acked-by,
> 
> v3:
>   - New.
> ---
>  .../testing/sysfs-driver-bd9571mwv-regulator  | 27 +++++++++++++++++++
>  1 file changed, 27 insertions(+)
>  create mode 100644 Documentation/ABI/testing/sysfs-driver-bd9571mwv-regulator
> 
> diff --git a/Documentation/ABI/testing/sysfs-driver-bd9571mwv-regulator b/Documentation/ABI/testing/sysfs-driver-bd9571mwv-regulator
> new file mode 100644
> index 0000000000000000..4d63a7904b94a993
> --- /dev/null
> +++ b/Documentation/ABI/testing/sysfs-driver-bd9571mwv-regulator
> @@ -0,0 +1,27 @@
> +What:		/sys/bus/i2c/devices/.../bd9571mwv-regulator.*.auto/backup_mode
> +Date:		Jul 2018
> +KernelVersion:	4.19
> +Contact:	Geert Uytterhoeven <geert+renesas@...der.be>
> +Description:	Read/write the current state of DDR Backup Mode, which controls
> +		if DDR power rails will be kept powered during system suspend.
> +		("on"/"1" = enabled, "off"/"0" = disabled).
> +		Two types of power switches (or control signals) can be used:
> +		  A. With a momentary power switch (or pulse signal), DDR
> +		     Backup Mode is enabled by default when available, as the
> +		     PMIC will be configured only during system suspend.
> +		  B. With a toggle power switch (or level signal), the
> +		     following steps must be followed exactly:
> +		       1. Configure PMIC for backup mode, to change the role of
> +			  the accessory power switch from a power switch to a
> +			  wake-up switch,
> +		       2. Switch accessory power switch off, to prepare for
> +			  system suspend, which is a manual step not controlled
> +			  by software,
> +		       3. Suspend system,
> +		       4. Switch accessory power switch on, to resume the
> +			  system.
> +		     DDR Backup Mode must be explicitly enabled by the user,
> +		     to invoke step 1.
> +		See also Documentation/devicetree/bindings/mfd/bd9571mwv.txt.
> +Users:		User space applications for embedded boards equipped with a
> +		BD9571MWV PMIC.
> -- 
> 2.17.1
> 

-- 
Regards,
Niklas Söderlund