linux-kernel - Re: [RESEND PATCH 1/2] spi: rockchip: Convert to late and early system PM callbacks

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Date:   Sat, 14 Oct 2017 02:25:48 +0800
From:   jeffy <jeffy.chen@...k-chips.com>
To:     Mark Brown <broonie@...nel.org>,
        Brian Norris <briannorris@...omium.org>
CC:     Doug Anderson <dianders@...omium.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Heiko Stuebner <heiko@...ech.de>,
        linux-spi <linux-spi@...r.kernel.org>,
        "open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>
Subject: Re: [RESEND PATCH 1/2] spi: rockchip: Convert to late and early system
 PM callbacks

On 10/14/2017 02:19 AM, jeffy wrote:
>
>
> it looks like the suspend sequence depends on the dt node sequence, and
> we are putting display-subsystem dt node above spi dt node, so it would
> be earlier in the device list, then got suspended later than spi device.
>
> the pwm backlight and cros_ec_spi pwm are very interesting, not only
> about suspend dependency... if we unbind cros_ec_spi pwm, the pwm
> backlight would still hold a reference to it, and crash the kernel later.

or maybe we should move device_pm_add() from device_add() to driver_bound()?