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spi: Order fields in spi_device for better packing

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Now that spi_device->mode is a u16, the chip_select, bits_per_mode,
and mode fields pack poorly, taking 8 bytes:  four data and four
padding.  By moving (u8)bits_per_word up one position, to after
(u8)chip_select, they pack better and only use 4 bytes.

Signed-off-by: Trent Piepho <tpiepho@gmail.com>
Reviewed-by: Sourav Poddar <sourav.poddar@ti.com>
Tested-by: Sourav Poddar <sourav.poddar@ti.com>g
Signed-off-by: Mark Brown <broonie@linaro.org>
This commit is contained in:
Trent Piepho 2013-12-13 18:27:44 -08:00 committed by Mark Brown
parent 0c64bc1b5e
commit 89c1f60746
1 changed files with 1 additions and 1 deletions
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2
include/linux/spi/spi.h
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@ -75,6 +75,7 @@ struct spi_device {
struct spi_master *master;
u32 max_speed_hz;
u8 chip_select;
u8 bits_per_word;
u16 mode;
#define SPI_CPHA 0x01 /* clock phase */
#define SPI_CPOL 0x02 /* clock polarity */
@ -92,7 +93,6 @@ struct spi_device {
#define SPI_TX_QUAD 0x200 /* transmit with 4 wires */
#define SPI_RX_DUAL 0x400 /* receive with 2 wires */
#define SPI_RX_QUAD 0x800 /* receive with 4 wires */
u8 bits_per_word;
int irq;
void *controller_state;
void *controller_data;