linux-kernel - Re: [PATCH] tty: serial: samsung: Set missing PM ops for hibernation support

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Message-ID: <20230805213824.ol7sr3b52rwrsfs6@intel.intel>
Date:   Sat, 5 Aug 2023 23:38:24 +0200
From:   Andi Shyti <andi.shyti@...nel.org>
To:     Anton Eliasson <anton.eliasson@...s.com>
Cc:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-serial@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel@...s.com
Subject: Re: [PATCH] tty: serial: samsung: Set missing PM ops for hibernation
 support

Hi Anton,

On Thu, Aug 03, 2023 at 01:26:42PM +0200, Anton Eliasson wrote:
> At least freeze, restore and thaw need to be set in order for the driver
> to support system hibernation. The existing suspend/resume functions can
> be reused since those functions don't touch the device's power state or
> wakeup capability. Use the helper macros SET_SYSTEM_SLEEP_PM_OPS and
> SET_NOIRQ_SYSTEM_SLEEP_PM_OPS for symmetry with similar drivers.

and why do we need hibernation in this device?

Andi