Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
Date:   Tue, 2 Mar 2021 09:13:23 +0530
From:   Viresh Kumar <viresh.kumar@linaro.org>
To:     Jie Deng <jie.deng@intel.com>
Cc:     linux-i2c@vger.kernel.org,
        virtualization@lists.linux-foundation.org,
        linux-kernel@vger.kernel.org, mst@redhat.com, wsa@kernel.org,
        jasowang@redhat.com, wsa+renesas@sang-engineering.com,
        andriy.shevchenko@linux.intel.com, conghui.chen@intel.com,
        arnd@arndb.de, kblaiech@mellanox.com,
        jarkko.nikula@linux.intel.com, Sergey.Semin@baikalelectronics.ru,
        rppt@kernel.org, loic.poulain@linaro.org, tali.perry1@gmail.com,
        u.kleine-koenig@pengutronix.de, bjorn.andersson@linaro.org,
        yu1.wang@intel.com, shuo.a.liu@intel.com,
        Paolo Bonzini <pbonzini@redhat.com>
Subject: Re: [PATCH v5] i2c: virtio: add a virtio i2c frontend driver
Message-ID: <20210302034323.gkqymzngyqofrdsr@vireshk-i7>
References: <00f826ffe1b6b4f5fb41de2b55ad6b8783b7ff45.1614579846.git.jie.deng@intel.com>
 <20210301115441.a4s5xzwm6d6ohz7f@vireshk-i7>
 <16efea9f-d606-4cf9-9213-3c1cf9b1a906@intel.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <16efea9f-d606-4cf9-9213-3c1cf9b1a906@intel.com>
User-Agent: NeoMutt/20180716-391-311a52
Precedence: bulk

On 02-03-21, 10:21, Jie Deng wrote:
> On 2021/3/1 19:54, Viresh Kumar wrote:
> That's my original proposal. I used to mirror this interface with "struct
> i2c_msg".
> 
> But the design philosophy of virtio TC is that VIRTIO devices are not
> specific to Linux
> so the specs design should avoid the limitations of the current Linux driver
> behavior.

Right, I understand that.

> We had some discussion about this. You may check these links to learn the
> story.
> https://lists.oasis-open.org/archives/virtio-comment/202010/msg00016.html
> https://lists.oasis-open.org/archives/virtio-comment/202010/msg00033.html
> https://lists.oasis-open.org/archives/virtio-comment/202011/msg00025.html

So the thing is that we want to support full duplex mode, right ?

How will that work protocol wise ? I mean how would we know if we are
expecting both tx and rx buffers in a transfer ?

-- 
viresh