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spi: Add spi_is_bpw_supported()

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This let SPI clients check if the controller supports a particular word
width. drivers/gpu/drm/tinydrm/mipi-dbi.c will use this to determine if
the controller supports 16-bit for RGB565 pixels. If it doesn't it will
swap the bytes before transfer on little endian machines.

Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Noralf Trønnes 2019-04-12 11:41:30 +02:00 committed by Mark Brown
parent 9e98c678c2
commit e6f3f7e4dc
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1 changed files with 20 additions and 0 deletions
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20
include/linux/spi/spi.h
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@ -983,6 +983,26 @@ spi_max_transfer_size(struct spi_device *spi)
return min(tr_max, msg_max);
}
/**
* spi_is_bpw_supported - Check if bits per word is supported
* @spi: SPI device
* @bpw: Bits per word
*
* This function checks to see if the SPI controller supports @bpw.
*
* Returns:
* True if @bpw is supported, false otherwise.
*/
static inline bool spi_is_bpw_supported(struct spi_device *spi, u32 bpw)
{
u32 bpw_mask = spi->master->bits_per_word_mask;
if (bpw == 8 || (bpw <= 32 && bpw_mask & SPI_BPW_MASK(bpw)))
return true;
return false;
}
/*---------------------------------------------------------------------------*/
/* SPI transfer replacement methods which make use of spi_res */