linux-kernel - Re: [PATCH] rtc: bq32000: add support to enable disable the trickle charge FET bypass.

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Date:   Tue, 31 Jan 2017 22:03:04 +0100
From:   Alexandre Belloni <alexandre.belloni@...e-electrons.com>
To:     Enric Balletbo i Serra <enric.balletbo@...labora.com>
Cc:     Alessandro Zummo <a.zummo@...ertech.it>,
        linux-kernel@...r.kernel.org, rtc-linux@...glegroups.com
Subject: Re: [PATCH] rtc: bq32000: add support to enable disable the trickle
 charge FET bypass.

On 27/01/2017 at 18:43:46 +0100, Enric Balletbo i Serra wrote:
> The bq32000 includes a trickle charge circuit to maintain the charge of the
> backup supply when a super capacitor is used.
> 
> You can enable the charging circuit by setting 'trickle-resistor-ohms',
> additionally you can set TCFE to 1 to bypass the internal diode and boost
> the charge voltage of the backup supply. You might want to enable/disable
> the TCFE switch from userspace (e.g when device is only connected to a
> battery)
> 
> This patch introduces a new sysfs entry to enable and disable this FET
> form userspace.
> 
> Signed-off-by: Enric Balletbo i Serra <enric.balletbo@...labora.com>
> ---
>  .../ABI/testing/sysfs-bus-i2c-devices-bq32k        |  7 ++
>  drivers/rtc/rtc-bq32k.c                            | 76 ++++++++++++++++++++++
>  2 files changed, 83 insertions(+)
>  create mode 100644 Documentation/ABI/testing/sysfs-bus-i2c-devices-bq32k
> 
Applied, thanks.

-- 
Alexandre Belloni, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com