linux-kernel - Re: [PATCH v5] iio: dac: ds4422/ds4424 dac driver

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Message-ID: <20170922160946.00007c7d@huawei.com>
Date:   Fri, 22 Sep 2017 16:09:46 +0100
From:   Jonathan Cameron <Jonathan.Cameron@...wei.com>
To:     Rob Herring <robh@...nel.org>
CC:     Ismail Kose <Ismail.Kose@...imintegrated.com>,
        "Ismail H. Kose" <ihkose@...il.com>,
        Jonathan Cameron <jic23@...nel.org>,
        Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        "Peter Meerwald-Stadler" <pmeerw@...erw.net>,
        Mark Rutland <mark.rutland@....com>,
        Peter Rosin <peda@...ntia.se>,
        Maxime Roussin-Belanger <maxime.roussinbelanger@...il.com>,
        Jean-Francois Dagenais <jeff.dagenais@...il.com>,
        Fabrice Gasnier <fabrice.gasnier@...com>,
        "Mike Looijmans" <mike.looijmans@...ic.nl>,
        <linux-iio@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5] iio: dac: ds4422/ds4424 dac driver

On Thu, 21 Sep 2017 18:26:59 -0500
Rob Herring <robh@...nel.org> wrote:

> On Tue, Sep 19, 2017 at 12:23:32AM -0700, Ismail Kose wrote:
> > From: "Ismail H. Kose" <ihkose@...il.com>
> > 
> > This patch provides an iio device driver for DS4422/DS4424 chips that support
> > two/four channel 7-bit Sink/Source Current DAC.
> > 
> > Signed-off-by: Ismail Kose <Ismail.Kose@...imintegrated.com>

Just a quick one before V6.  Please don't reply to a previous version
when sending a new version.  It leads to very deep and confusing thread
structures.

Just start a new thread.

Jonathan
> > ---
> > v5:
> > 	* Removed unused variable
> > v4:
> > 	* Removed unnecessary code and space optimization
> > 	* Alphabetic order in Kcobfig and Makefile
> > v3:
> > 	* Removed iio-map and platform file support
> > 	* Removed ds4424.h file
> > 	* Fixed ADC value read bug
> > 	* Removed confused comments
> > 	* Added device tree binding file
> > 	* Fixed bugs in probe and read function
> > 
> > v2:
> > 	* Fixed coding style and removed unncessary code
> > 	* Removed min/max rfs, ifs-scale, etc values from device tree
> > 	* Removed unused code, definitions and some comments
> > 	* Removed regulator control and made standard structure
> > 	* Removed data processing and channel scale
> > 	* Removed device tree binding file
> > 
> >  .../devicetree/bindings/iio/dac/ds4424.txt         |  20 ++  
> 
> It's preferred to split bindings to separate patch.
> 
> >  drivers/iio/dac/Kconfig                            |   9 +
> >  drivers/iio/dac/Makefile                           |   1 +
> >  drivers/iio/dac/ds4424.c                           | 394 +++++++++++++++++++++
> >  4 files changed, 424 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/iio/dac/ds4424.txt
> >  create mode 100644 drivers/iio/dac/ds4424.c
> > 
> > diff --git a/Documentation/devicetree/bindings/iio/dac/ds4424.txt b/Documentation/devicetree/bindings/iio/dac/ds4424.txt
> > new file mode 100644
> > index 000000000000..840b11e1d813
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/iio/dac/ds4424.txt
> > @@ -0,0 +1,20 @@
> > +Maxim Integrated DS4422/DS4424 7-bit Sink/Source Current DAC Device Driver
> > +
> > +Datasheet publicly available at:
> > +https://datasheets.maximintegrated.com/en/ds/DS4422-DS4424.pdf
> > +
> > +Required properties:
> > +	- compatible: Must be "maxim,ds4422" or "maxim,ds4424"  
> 
> One compatible per line please.
> 
> > +	- reg: Should contain the DAC I2C address
> > +	- maxim,rfs-resistors-ohms: Should contain reference resistor  
> 
> ...reference resistor ohms
> 
> > +
> > +Optional properties:
> > +	- vcc-supply: Power supply is optional. If not defined, driver will ignore it.
> > +
> > +Example:
> > +	ds4224@10 {
> > +		compatible = "maxim,ds4424";
> > +		reg = <0x10>; /* When A0, A1 pins are ground */
> > +		vcc-supply = "dac_vcc_3v3";  
> 
> This is not how the regulator binding works.
> 
> > +		maxim,rfs-resistors-ohms = <400 800 1000 1600>;  
> 
> The description needs to explain this is 4 values.
> 
> > +	};  
> --
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