linux-kernel - RE: [PATCH 2/8] spi: spi-ep93xx: use bits_per_word

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Date:	Mon, 1 Jul 2013 13:22:50 -0500
From:	H Hartley Sweeten <hartleys@...ionengravers.com>
To:	Mika Westerberg <mika.westerberg@....fi>
CC:	Linux Kernel <linux-kernel@...r.kernel.org>,
	"spi-devel-general@...ts.sourceforge.net" 
	<spi-devel-general@...ts.sourceforge.net>,
	Ryan Mallon <rmallon@...il.com>,
	"broonie@...nel.org" <broonie@...nel.org>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>
Subject: RE: [PATCH 2/8] spi: spi-ep93xx: use bits_per_word_mask

On Sunday, June 30, 2013 9:14 AM, Mika Westerberg wrote:
> On Fri, Jun 28, 2013 at 11:43:07AM -0700, H Hartley Sweeten wrote:
>> This driver supports 16 to 4 bits per work. Set the bits_per_word_mask
>> to allows the spi core to handle validation.
>> 
>> Signed-off-by: H Hartley Sweeten <hsweeten@...ionengravers.com>
>> Cc: Ryan Mallon <rmallon@...il.com>
>> Cc: Mika Westerberg <mika.westerberg@....fi>
>> Cc: Mark Brown <broonie@...nel.org>
>> Cc: Grant Likely <grant.likely@...aro.org>
>> ---
>>  drivers/spi/spi-ep93xx.c | 11 +----------
>>  1 file changed, 1 insertion(+), 10 deletions(-)
>> 
>> diff --git a/drivers/spi/spi-ep93xx.c b/drivers/spi/spi-ep93xx.c
>> index c633cd0..93ae7b6 100644
>> --- a/drivers/spi/spi-ep93xx.c
>> +++ b/drivers/spi/spi-ep93xx.c
>> @@ -272,12 +272,6 @@ static int ep93xx_spi_setup(struct spi_device *spi)
>>  	struct ep93xx_spi *espi = spi_master_get_devdata(spi->master);
>>  	struct ep93xx_spi_chip *chip;
>>  
>> -	if (spi->bits_per_word < 4 || spi->bits_per_word > 16) {
>> -		dev_err(&espi->pdev->dev, "invalid bits per word %d\n",
>> -			spi->bits_per_word);
>> -		return -EINVAL;
>> -	}
>> -
>>  	chip = spi_get_ctldata(spi);
>>  	if (!chip) {
>>  		dev_dbg(&espi->pdev->dev, "initial setup for %s\n",
>> @@ -341,10 +335,6 @@ static int ep93xx_spi_transfer(struct spi_device *spi, struct spi_message *msg)
>>  
>>  	/* first validate each transfer */
>>  	list_for_each_entry(t, &msg->transfers, transfer_list) {
>> -		if (t->bits_per_word) {
>> -			if (t->bits_per_word < 4 || t->bits_per_word > 16)
>> -				return -EINVAL;
>> -		}
>>  		if (t->speed_hz && t->speed_hz < espi->min_rate)
>>  				return -EINVAL;
>>  	}
>> @@ -1022,6 +1012,7 @@ static int ep93xx_spi_probe(struct platform_device *pdev)
>>  	master->bus_num = pdev->id;
>>  	master->num_chipselect = info->num_chipselect;
>>  	master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH;
>> +	master->bits_per_word_mask = 0xfff8;	/* 16 to 4 bits per word */
>
> Please use SPI_BPW_RANGE_MASK(4, 16) here.

I thought there was a macro for this, just couldn't find it. I'll fix this.

Thanks, 
Hartley

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