linux-kernel - Re: [PATCH] watchdog: meson: Fix the wrong value of left time

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Date:   Thu, 03 Oct 2019 10:35:20 -0700
From:   Kevin Hilman <khilman@...libre.com>
To:     Xingyu Chen <xingyu.chen@...ogic.com>,
        Wim Van Sebroeck <wim@...ux-watchdog.org>,
        Guenter Roeck <linux@...ck-us.net>,
        Neil Armstrong <narmstrong@...libre.com>
Cc:     Xingyu Chen <xingyu.chen@...ogic.com>,
        Jerome Brunet <jbrunet@...libre.com>,
        Qianggui Song <qianggui.song@...ogic.com>,
        Jianxin Pan <jianxin.pan@...ogic.com>,
        linux-watchdog@...r.kernel.org, linux-amlogic@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] watchdog: meson: Fix the wrong value of left time

Xingyu Chen <xingyu.chen@...ogic.com> writes:

> The left time value is wrong when we get it by sysfs. The left time value
> should be equal to preset timeout value minus elapsed time value. According
> to the Meson-GXB/GXL datasheets which can be found at [0], the timeout value
> is saved to BIT[0-15] of the WATCHDOG_TCNT, and elapsed time value is saved
> to BIT[16-31] of the WATCHDOG_TCNT.
>
> [0]: http://linux-meson.com
>
> Fixes: 683fa50f0e18 ("watchdog: Add Meson GXBB Watchdog Driver")
> Signed-off-by: Xingyu Chen <xingyu.chen@...ogic.com>

Reviewed-by: Kevin Hilman <khilman@...libre.com>