linux-kernel - Re: [PATCH v10] i2c: virtio: add a virtio i2c frontend driver

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Date:   Wed, 24 Mar 2021 09:30:20 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Jie Deng <jie.deng@...el.com>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Linux I2C <linux-i2c@...r.kernel.org>,
        virtualization@...ts.linux-foundation.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Wolfram Sang <wsa@...nel.org>,
        Jason Wang <jasowang@...hat.com>,
        Wolfram Sang <wsa+renesas@...g-engineering.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        conghui.chen@...el.com, kblaiech@...lanox.com,
        jarkko.nikula@...ux.intel.com,
        Sergey Semin <Sergey.Semin@...kalelectronics.ru>,
        Mike Rapoport <rppt@...nel.org>, loic.poulain@...aro.org,
        Tali Perry <tali.perry1@...il.com>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        yu1.wang@...el.com, shuo.a.liu@...el.com,
        Stefan Hajnoczi <stefanha@...hat.com>,
        Paolo Bonzini <pbonzini@...hat.com>
Subject: Re: [PATCH v10] i2c: virtio: add a virtio i2c frontend driver

On 24-03-21, 09:17, Jie Deng wrote:
> I didn't see the "struct virtio_driver" has a member "struct dev_pm_ops *pm"
> 
> It defines its own hooks (freeze and restore) though it includes "struct
> device_driver"
> 
> which has a "struct dev_pm_ops *pm".
> 
> I just follow other virtio drivers to directly use the hooks defined in
> "struct virtio_driver".

Right, I think we can't use the SIMPLE PM OPS for virtio yet, the core calls
only the freeze and restore callbacks which are part of struct virtio_driver.

> For this driver, Both __maybe_unused and #ifdef are OK to me.

Yes, and so you should use only #ifdef here as Arnd confirmed. You shouldn't be
using __maybe_unused as there is nothing confusing here related to the macros.

-- 
viresh