diff options
Diffstat (limited to 'include')
| -rw-r--r-- | include/spi/spi.h | 30 |
1 files changed, 18 insertions, 12 deletions
diff --git a/include/spi/spi.h b/include/spi/spi.h index 620e5e57b4..8c6927da41 100644 --- a/include/spi/spi.h +++ b/include/spi/spi.h @@ -20,13 +20,14 @@ struct spi_board_info { }; /** - * struct spi_device - Master side proxy for an SPI slave device + * struct spi_device - Controller side proxy for an SPI slave device * @dev: Driver model representation of the device. - * @master: SPI controller used with the device. + * @controller: SPI controller used with the device. + * @master: Copy of controller, for backwards compatibility * @max_speed_hz: Maximum clock rate to be used with this chip * (on this board); may be changed by the device's driver. * The spi_transfer.speed_hz can override this for each transfer. - * @chip_select: Chipselect, distinguishing chips handled by @master. + * @chip_select: Chipselect, distinguishing chips handled by @controller. * @mode: The spi mode defines how data is clocked out and in. * This may be changed by the device's driver. * The "active low" default for chipselect mode can be overridden @@ -59,7 +60,8 @@ struct spi_board_info { */ struct spi_device { struct device_d dev; - struct spi_master *master; + struct spi_controller *controller; + struct spi_controller *master; /* compatibility layer */ u32 max_speed_hz; u8 chip_select; u8 mode; @@ -93,7 +95,7 @@ struct spi_device { struct spi_message; /** - * struct spi_master - interface to SPI master controller + * struct spi_controller - interface to SPI master or slave controller * @dev: device interface to this driver * @bus_num: board-specific (and often SOC-specific) identifier for a * given SPI controller. @@ -108,8 +110,9 @@ struct spi_message; * the device whose settings are being modified. * @transfer: adds a message to the controller's transfer queue. * @cleanup: frees controller-specific state + * @list: link with the global spi_controller list * - * Each SPI master controller can communicate with one or more @spi_device + * Each SPI controller can communicate with one or more @spi_device * children. These make a small bus, sharing MOSI, MISO and SCK signals * but not chip select signals. Each device may be configured to use a * different clock rate, since those shared signals are ignored unless @@ -120,7 +123,7 @@ struct spi_message; * an SPI slave device. For each such message it queues, it calls the * message's completion function when the transaction completes. */ -struct spi_master { +struct spi_controller { struct device_d *dev; /* other than negative (== assign one dynamically), bus_num is fully @@ -147,7 +150,7 @@ struct spi_master { * any other request management * + To a given spi_device, message queueing is pure fifo * - * + The master's main job is to process its message queue, + * + The controller's main job is to process its message queue, * selecting a chip then transferring data * + If there are multiple spi_device children, the i/o queue * arbitration algorithm is unspecified (round robin, fifo, @@ -161,12 +164,15 @@ struct spi_master { int (*transfer)(struct spi_device *spi, struct spi_message *mesg); - /* called on release() to free memory provided by spi_master */ + /* called on release() to free memory provided by spi_controller */ void (*cleanup)(struct spi_device *spi); struct list_head list; }; +#define spi_master spi_controller +#define spi_register_master(_ctrl) spi_register_controller(_ctrl) + /*---------------------------------------------------------------------------*/ /* @@ -341,9 +347,9 @@ spi_transfer_del(struct spi_transfer *t) int spi_sync(struct spi_device *spi, struct spi_message *message); -struct spi_device *spi_new_device(struct spi_master *master, +struct spi_device *spi_new_device(struct spi_controller *ctrl, struct spi_board_info *chip); -int spi_register_master(struct spi_master *master); +int spi_register_controller(struct spi_controller *ctrl); #ifdef CONFIG_SPI int spi_register_board_info(struct spi_board_info const *info, int num); @@ -431,7 +437,7 @@ static inline ssize_t spi_w8r8(struct spi_device *spi, u8 cmd) extern struct bus_type spi_bus; -struct spi_master *spi_get_master(int bus); +struct spi_controller *spi_get_controller(int bus); static inline int spi_driver_register(struct driver_d *drv) { |