linux-kernel - Re: [PATCH] Add support for flag status register on Micron chips.

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Message-id: <000901cf53dd$86a71b50$93f551f0$%han@samsung.com>
Date:	Wed, 09 Apr 2014 19:21:52 +0900
From:	Jingoo Han <jg1.han@...sung.com>
To:	'Marek Vasut' <marex@...x.de>, 'Graham Moore' <grmoore@...era.com>
Cc:	ggrahammoore@...il.com, 'David Woodhouse' <dwmw2@...radead.org>,
	'Brian Norris' <computersforpeace@...il.com>,
	'Artem Bityutskiy' <artem.bityutskiy@...ux.intel.com>,
	'Sourav Poddar' <sourav.poddar@...com>,
	'Sascha Hauer' <s.hauer@...gutronix.de>,
	'Geert Uytterhoeven' <geert+renesas@...ux-m68k.org>,
	'Insop Song' <insop.song@...nspeed.com>,
	linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org,
	'Alan Tull' <atull@...era.com>,
	'Dinh Nguyen' <dinguyen@...era.com>,
	'Yves Vandervennet' <rocket.yvanderv@...il.com>,
	'Jingoo Han' <jg1.han@...sung.com>
Subject: Re: [PATCH] Add support for flag status register on Micron chips.

On Wednesday, April 09, 2014 7:16 PM, Jingoo Han wrote:
> On Wednesday, April 09, 2014 7:07 PM, Marek Vasut wrote:
> > On Tuesday, April 08, 2014 at 06:12:50 PM, grmoore@...era.com wrote:
> > > From: Graham Moore <grmoore@...era.com>
> > >
> > > Some new Micron flash chips require reading the flag
> > > status register to determine when operations have completed.
> > >
> > > Furthermore, chips with multi-die stacks of the 65nm 256Mb QSPI also
> > > require reading the status register before reading the flag status
> > > register.
> > >
> > > This patch adds support for the flag status register in the n25q512a1 and
> > > n25q00 Micron QSPI flash chips.
> >
> > [...]
> >
> > > +static int read_fsr(struct m25p *flash)
> > > +{
> > > +	ssize_t retval;
> > > +	u8 code = OPCODE_RDFSR;
> > > +	u8 val;
> > > +
> > > +	retval = spi_write_then_read(flash->spi, &code, 1, &val, 1);
> > > +
> > > +	if (retval < 0) {
> > > +		dev_err(&flash->spi->dev, "error %d reading FSR\n",
> > > +				(int) retval);
> >
> > Is the type-cast really needed here? Why ?
> 
> The type-cast looks clumsy.
> The type of 'retval' is retval; thus, '%zd' can be used,

Sorry, there is a typo!
s/retval/ssize_t

The type of 'retval' is "ssize_t"; thus, '%zd' can be used,
instead of '%d', as below.

 +		dev_err(&flash->spi->dev, "error %zd reading FSR\n",
 +				retval);

Best regards,
Jingoo Han

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