linux-kernel - Re: [spi-devel-general] [PATCH] SST25L (non JEDEC) SPI Flash driver

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Date:	Mon, 22 Jun 2009 07:14:57 +0300
From:	Baruch Siach <baruch@...s.co.il>
To:	Ryan Mallon <ryan@...ewatersys.com>
Cc:	David Woodhouse <dwmw2@...radead.org>,
	linux-mtd@...ts.infradead.org,
	spi-devel-general@...ts.sourceforge.net, mike@...roidmicros.com,
	linux kernel <linux-kernel@...r.kernel.org>
Subject: Re: [spi-devel-general] [PATCH] SST25L (non JEDEC) SPI Flash driver

Hi Ryan,

On Mon, Jun 22, 2009 at 03:58:51PM +1200, Ryan Mallon wrote:
> +static int sst25l_erase_block(struct sst25l_flash *flash, u32 offset)
> +{
> +	u8 command[4];
> +	int err;
> +
> +	err = sst25l_write_enable(flash, 1);

Is this enable/disable strictly required for each write/erase? Can't we just 
enable write once?

> +	if (err)
> +		return err;
> +
> +	command[0] = SST25L_CMD_BLOCK_ERASE;
> +	command[1] = offset >> 16;
> +	command[2] = offset >> 8;
> +	command[3] = offset;
> +	err = spi_write(flash->spi, command, 4);
> +	if (err)
> +		return err;
> +
> +	err = sst25l_wait_till_ready(flash);
> +	if (err)
> +		return err;
> +
> +	return sst25l_write_enable(flash, 0);
> +}

baruch

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