Re: [PATCH v7 1/2] mtd: arasan: Add device tree binding documentation

[Boris Brezillon]

On Tue, 10 Jan 2017 08:48:09 +0000
Punnaiah Choudary Kalluri <punnaiah.choudary.kalluri@xxxxxxxxxx> wrote:

> Hi Boris,
> 
>   Thanks. I will implement these changes and send the next series.

Please wait a bit. I still need to review the driver.

> 
> Regards,
> Punnaiah
> 
> > -----Original Message-----
> > From: Boris Brezillon [mailto:boris.brezillon@xxxxxxxxxxxxxxxxxx]
> > Sent: Tuesday, January 10, 2017 1:36 PM
> > To: Punnaiah Choudary Kalluri <punnaia@xxxxxxxxxx>
> > Cc: Rob Herring <robh@xxxxxxxxxx>; dwmw2@xxxxxxxxxxxxx;
> > computersforpeace@xxxxxxxxx; marek.vasut@xxxxxxxxx; richard@xxxxxx;
> > cyrille.pitchen@xxxxxxxxx; mark.rutland@xxxxxxx; linux-
> > kernel@xxxxxxxxxxxxxxx; linux-mtd@xxxxxxxxxxxxxxxxxxx;
> > devicetree@xxxxxxxxxxxxxxx; Michal Simek <michals@xxxxxxxxxx>;
> > kalluripunnaiahchoudary@xxxxxxxxx; kpc528@xxxxxxxxx
> > Subject: Re: [PATCH v7 1/2] mtd: arasan: Add device tree binding
> > documentation
> > 
> > Hi Punnaiah,
> > 
> > On Tue, 10 Jan 2017 06:03:25 +0000
> > Punnaiah Choudary Kalluri <punnaiah.choudary.kalluri@xxxxxxxxxx> wrote:
> >   
> > > Hi Rob,
> > >
> > >    Thanks for the review.
> > >  
> > > > -----Original Message-----
> > > > From: Rob Herring [mailto:robh@xxxxxxxxxx]
> > > > Sent: Tuesday, January 10, 2017 11:06 AM
> > > > To: Punnaiah Choudary Kalluri <punnaia@xxxxxxxxxx>
> > > > Cc: dwmw2@xxxxxxxxxxxxx; computersforpeace@xxxxxxxxx;
> > > > boris.brezillon@xxxxxxxxxxxxxxxxxx; marek.vasut@xxxxxxxxx;
> > > > richard@xxxxxx; cyrille.pitchen@xxxxxxxxx; mark.rutland@xxxxxxx;  
> > linux-  
> > > > kernel@xxxxxxxxxxxxxxx; linux-mtd@xxxxxxxxxxxxxxxxxxx;
> > > > devicetree@xxxxxxxxxxxxxxx; Michal Simek <michals@xxxxxxxxxx>;
> > > > kalluripunnaiahchoudary@xxxxxxxxx; kpc528@xxxxxxxxx; Punnaiah
> > > > Choudary Kalluri <punnaia@xxxxxxxxxx>
> > > > Subject: Re: [PATCH v7 1/2] mtd: arasan: Add device tree binding
> > > > documentation
> > > >
> > > > On Mon, Jan 09, 2017 at 08:28:53AM +0530, Punnaiah Choudary Kalluri  
> > wrote:  
> > > > > This patch adds the dts binding document for arasan nand flash
> > > > > controller.
> > > > >
> > > > > Signed-off-by: Punnaiah Choudary Kalluri <punnaia@xxxxxxxxxx>
> > > > > ---
> > > > > Changes in v7:
> > > > > - Corrected the acronyms those should be in caps
> > > > > changes in v6:
> > > > > - Removed num-cs property
> > > > > - Separated nandchip from nand controller
> > > > > changes in v5:
> > > > > - None
> > > > > Changes in v4:
> > > > > - Added num-cs property
> > > > > - Added clock support
> > > > > Changes in v3:
> > > > > - None
> > > > > Changes in v2:
> > > > > - None
> > > > > ---
> > > > >  .../devicetree/bindings/mtd/arasan_nfc.txt         | 38  
> > > > ++++++++++++++++++++++  
> > > > >  1 file changed, 38 insertions(+)
> > > > >  create mode 100644  
> > > > Documentation/devicetree/bindings/mtd/arasan_nfc.txt  
> > > > >
> > > > > diff --git a/Documentation/devicetree/bindings/mtd/arasan_nfc.txt  
> > > > b/Documentation/devicetree/bindings/mtd/arasan_nfc.txt  
> > > > > new file mode 100644
> > > > > index 0000000..f20adfc
> > > > > --- /dev/null
> > > > > +++ b/Documentation/devicetree/bindings/mtd/arasan_nfc.txt
> > > > > @@ -0,0 +1,38 @@
> > > > > +Arasan NAND Flash Controller with ONFI 3.1 support
> > > > > +
> > > > > +Required properties:
> > > > > +- compatible: Should be "arasan,nfc-v3p10"  
> > > >
> > > > Needs a note that it must also have an SoC specific compatible string.
> > > >  
> > >   Sorry, I couldn't understand this comment. Could you elaborate it?  
> > 
> > Arasan is an IP vendor, and those IPs are usually embedded in specific
> > SoCs. I guess Rob was suggesting to define something like:
> > 
> >   compatible = "<soc-vendor>,<ip-revision>", "arasan,<ip-revision>";
> > 
> > This way you can differentiate minor changes/tweaks between each SoC
> > (each SoC vendor usually enable/disable specific features based on
> > their needs).
> >   
> > >  
> > > > > +- reg: Memory map for module access
> > > > > +- interrupt-parent: Interrupt controller the interrupt is routed through
> > > > > +- interrupts: Should contain the interrupt for the device
> > > > > +- clock-name: List of input clocks - "clk_sys", "clk_flash"  
> > > >
> > > > clk_ is redundant.
> > > >  
> > >
> > >  I have defined these clock names as per the controller data sheet.
> > >  So, I feel it is fine to have them in sync with the datasheet.
> > >   Please let me know if you still want me to change this.  
> > 
> > We already know this is a clock, hence the unneeded clk_ prefix. Please
> > drop it.
> > 
> > Thanks,
> > 
> > Boris