Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
MIME-Version: 1.0
In-Reply-To: <YzQf7hf15vvLeGse@google.com>
References: <Yr66ZZqEnBApHYMA@google.com> <YsLhxx+L3+GJDRyO@google.com>
 <bcc5f059-b991-296a-bba6-9cb1236097f2@quicinc.com> <Ys1tYAO39LKzEAOE@google.com>
 <dc737abb-041b-491a-14f1-a584f9e64a3d@quicinc.com> <CAE-0n528QaTtZFp=WAaHShegFRpKVN_67jQfUJTtsRPr6s--zA@mail.gmail.com>
 <52039cd1-4390-7abb-d296-0eb7ac0c3b15@quicinc.com> <Yuz2O+lZ5W7RviuA@google.com>
 <CAE-0n507SLeYB7XVzGFk=RO6YjOPoGpux+_N2AyrmL354mQJ-g@mail.gmail.com> <YzQf7hf15vvLeGse@google.com>
From:   Stephen Boyd <swboyd@chromium.org>
User-Agent: alot/0.10
Date:   Wed, 28 Sep 2022 21:20:31 -0400
Message-ID: <CAE-0n50cX5ky3By976RTecKkpeMoAjoBA4tYuWSZ150JfS9wiQ@mail.gmail.com>
Subject: Re: [PATCH V15 6/9] mfd: pm8008: Use i2c_new_dummy_device() API
To:     Lee Jones <lee@kernel.org>
Cc:     Lee Jones <lee.jones@linaro.org>,
        Satya Priya Kakitapalli <quic_c_skakit@quicinc.com>,
        Mark Brown <broonie@kernel.org>,
        Bjorn Andersson <bjorn.andersson@linaro.org>,
        Rob Herring <robh+dt@kernel.org>,
        Liam Girdwood <lgirdwood@gmail.com>,
        linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org, quic_collinsd@quicinc.com,
        quic_subbaram@quicinc.com, quic_jprakash@quicinc.com
Content-Type: text/plain; charset="UTF-8"
Precedence: bulk

Quoting Lee Jones (2022-09-28 03:20:30)
> Wouldn't it make more sense to simply separate the instantiation of
> the 2 I2C devices?  Similar to what you suggested [0] in v9.  That way
> they can handle their own resources and we can avoid all of the I2C
> dummy / shared Regmap passing faff.
>
> [0] https://lore.kernel.org/all/CAE-0n53G-atsuwqcgNvi3nvWyiO3P=pSj5zDUMYj0ELVYJE54Q@mail.gmail.com/
>

You can continue reading the thread[1]. My understanding is it's one
chip that responds on two i2c addresses, thus we don't describe that as
two i2c device nodes in DT. Instead we describe one node and use the
dummy API to make the second i2c device.

[1] https://lore.kernel.org/all/Yk3NkNK3e+fgj4eG@sirena.org.uk/