Date:   Wed, 1 Dec 2021 23:35:59 +0100
From:   Andreas Kemnade <andreas@kemnade.info>
To:     Alistair Francis <alistair23@gmail.com>
Cc:     Alistair Francis <alistair@alistair23.me>,
        Lee Jones <lee.jones@linaro.org>,
        Mark Brown <broonie@kernel.org>,
        Sascha Hauer <kernel@pengutronix.de>, lgirdwood@gmail.com,
        Rob Herring <robh+dt@kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        rui.zhang@intel.com, devicetree <devicetree@vger.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
        Sascha Hauer <s.hauer@pengutronix.de>,
        linux-hwmon@vger.kernel.org, amitk@kernel.org,
        linux-pm@vger.kernel.org, dl-linux-imx <linux-imx@nxp.com>,
        Shawn Guo <shawnguo@kernel.org>, Rob Herring <robh@kernel.org>
Subject: Re: [PATCH v15 1/8] dt-bindings: mfd: Initial commit of
 silergy,sy7636a.yaml
Message-ID: <20211201233559.3bc64f8b@aktux>
In-Reply-To: <CAKmqyKO-KUhfeeOTFtMzLrZ5MUiL2-5qov-g+VYZxC_8du=ksA@mail.gmail.com>
References: <20211110122948.188683-1-alistair@alistair23.me>
        <20211110122948.188683-2-alistair@alistair23.me>
        <20211117223950.3a7eaf7a@aktux>
        <CAKmqyKP_gQ1qSADMPwmyf-V0TqGOYf2GitzpDXsmBUO6_iqK7Q@mail.gmail.com>
        <20211125235935.5a1b7d33@aktux>
        <CAKmqyKO-KUhfeeOTFtMzLrZ5MUiL2-5qov-g+VYZxC_8du=ksA@mail.gmail.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit
Precedence: bulk

Hi,

[...]
> > > This is a vcom in the sense of voltage for compensation. We just
> > > currently don't support setting the vcom.
> > >
> > > I had a look at the Kobo code and this is similar to
> > > https://github.com/akemnade/linux/blob/kobo/epdc-pmic-5.15/drivers/regulator/sy7636-regulator.c#L614
> > >
> > > So I think that vcom is still the appropriate name for this.
> > >  
> > seems that you did not get me. If I understand the code behind it
> > correctly, it turns on all power rails (the +-15V stuff, VEE and so on)
> > with the defined delays, not just vcom because it sets
> > SY7636A_OPERATION_MODE_CRL_ONOFF. Controlling VCOM separately is possible
> > by using SY7636A_OPERATION_MODE_CRL_VCOMCTL in combintion with a
> > vcom_en gpio.
> >
> > I do not see a reason to turn on vcom only without the other higher
> > voltage rails, so the behaviour is not necessarily wrong but if I read
> > the binding documentation I would expect that just vcom is turned on.
> > That is the mismatch I am talking about.  
> 
> Ah! Ok I understand. I'll rename it to vdd then.
> 
Most important is IMHO some human-readable description in the bindings
document.

I am also just wondering whether this kind of logical
regulator which turns on several other regulators is actually accepted
or just slipped through review. I have no strong opinion here. I just
want to be able to clean up the tps65185 driver in the same way and not
having two similar pmics with different bindings and then a mess at the
consumer side. 

Regards,
Andreas