GitHub-Mirror/Star64_linux
2
0
Fork 0
mirror of https://github.com/Fishwaldo/Star64_linux.git synced 2025-07-23 15:27:29 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

Merge remote-tracking branches 'spi/topic/fsl-espi', 'spi/topic/imx', 'spi/topic/jcore', 'spi/topic/loopback' and 'spi/topic/meson' into spi-next

Browse source
This commit is contained in:
Mark Brown 2016-09-30 09:14:10 -07:00
commit e2df04ed3b
11 changed files with 561 additions and 387 deletions
Download patch file Download diff file Expand all files Collapse all files

25
include/linux/spi/spi.h
View file

@ -312,6 +312,8 @@ static inline void spi_unregister_driver(struct spi_driver *sdrv)
* @flags: other constraints relevant to this driver
* @max_transfer_size: function that returns the max transfer size for
* a &spi_device; may be %NULL, so the default %SIZE_MAX will be used.
* @max_message_size: function that returns the max message size for
* a &spi_device; may be %NULL, so the default %SIZE_MAX will be used.
* @io_mutex: mutex for physical bus access
* @bus_lock_spinlock: spinlock for SPI bus locking
* @bus_lock_mutex: mutex for exclusion of multiple callers
@ -442,10 +444,11 @@ struct spi_master {
#define SPI_MASTER_MUST_TX BIT(4) /* requires tx */
/*
* on some hardware transfer size may be constrained
* on some hardware transfer / message size may be constrained
* the limit may depend on device transfer settings
*/
size_t (*max_transfer_size)(struct spi_device *spi);
size_t (*max_message_size)(struct spi_device *spi);
/* I/O mutex */
struct mutex io_mutex;
@ -904,13 +907,27 @@ extern int spi_async(struct spi_device *spi, struct spi_message *message);
extern int spi_async_locked(struct spi_device *spi,
struct spi_message *message);
static inline size_t
spi_max_message_size(struct spi_device *spi)
{
struct spi_master *master = spi->master;
if (!master->max_message_size)
return SIZE_MAX;
return master->max_message_size(spi);
}
static inline size_t
spi_max_transfer_size(struct spi_device *spi)
{
struct spi_master *master = spi->master;
if (!master->max_transfer_size)
return SIZE_MAX;
return master->max_transfer_size(spi);
size_t tr_max = SIZE_MAX;
size_t msg_max = spi_max_message_size(spi);
if (master->max_transfer_size)
tr_max = master->max_transfer_size(spi);
/* transfer size limit must not be greater than messsage size limit */
return min(tr_max, msg_max);
}
/*---------------------------------------------------------------------------*/