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

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Date:	Wed, 9 Apr 2014 12:06:45 +0200
From:	Marek Vasut <marex@...x.de>
To:	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>,
	Jingoo Han <jg1.han@...sung.com>,
	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>
Subject: Re: [PATCH] Add support for flag status register on Micron chips.

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 ?

> +		return retval;
> +	}
> +
> +	return val;
> +}
> +/*
>   * Read configuration register, returning its value in the
>   * location. Return the configuration register value.
>   * Returns negative if error occured.
> @@ -233,7 +259,7 @@ static inline int set_4byte(struct m25p *flash, u32
> jedec_id, int enable) * Service routine to read status register until
> ready, or timeout occurs. * Returns non-zero if error.
>   */
> -static int wait_till_ready(struct m25p *flash)
> +static int _wait_till_ready(struct m25p *flash)

Please avoid using function names that start with underscore .
[...]

Thanks!

Best regards,
Marek Vasut
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