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

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Message-ID: <20141104143801.GM1618@lahna.fi.intel.com>
Date:	Tue, 4 Nov 2014 16:38:01 +0200
From:	Mika Westerberg <mika.westerberg@...ux.intel.com>
To:	Grant Likely <grant.likely@...aro.org>
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,
	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 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.

> Otherwise:
> Acked-by: Grant Likely <grant.likely@...aro.org>

Thanks.
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