linux-kernel - Re: [PATCH v6 04/12] misc: at25: Make use of device property API

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Message-ID: <CACxGe6u5ppSjHc-Wa7K_NWQ9YEZ_V3ys9fdsECss_bPabUTN+g@mail.gmail.com>
Date:	Tue, 4 Nov 2014 15:04:54 +0000
From:	Grant Likely <grant.likely@...aro.org>
To:	Mika Westerberg <mika.westerberg@...ux.intel.com>
Cc:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Darren Hart <darren.hart@...el.com>,
	Aaron Lu <aaron.lu@...el.com>, Arnd Bergmann <arnd@...db.de>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Alexandre Courbot <gnurou@...il.com>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Bryan Wu <cooloney@...il.com>
Subject: Re: [PATCH v6 04/12] misc: at25: Make use of device property API

On Tue, Nov 4, 2014 at 2:38 PM, Mika Westerberg
<mika.westerberg@...ux.intel.com> wrote:
> On Tue, Nov 04, 2014 at 02:18:26PM +0000, Grant Likely wrote:
>> > -   strncpy(chip->name, np->name, sizeof(chip->name));
>> > +   strncpy(chip->name, "at25", sizeof(chip->name));
>>
>> This line changes behaviour of the driver. It's possibly not a problem,
>> but it should be commented on and whether any due diligance has been
>> done to make sure it there isn't anything that depends on it.
>
> I found only one user for "atmel,at25" in any of the DT sample files.
>
> arch/arm/boot/dts/phy3250.dts:
>
>         eeprom: at25@0 {
>                 ...
>                 at25,byte-len = <0x8000>;
>                 at25,addr-mode = <2>;
>                 at25,page-size = <64>;
>
>                 compatible = "atmel,at25";
>                 reg = <0>;
>                 spi-max-frequency = <5000000>;
>         };
>
> I think np->name is "at25" in this case? The binding file
> Documentation/devicetree/bindings/misc/at25.txt also has the same name.
>
> Are you OK, if we add something like below to the changelog?
>
>  In addition we hard-code the name of the chip to be "at25" for the
>  reason that there is no common mechanism to fetch name of the firmware
>  node. The only existing user (arch/arm/boot/dts/phy3250.dts) uses the
>  same name so it should continue to work.

Yes. If somebody complains, then we can reinstate the previous
behaviour, but assume it isn't necessary for now.

g.
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