diff options
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/platform_data/spi-mt65xx.h | 1 | ||||
| -rw-r--r-- | include/linux/pxa2xx_ssp.h | 2 | ||||
| -rw-r--r-- | include/linux/spi/spi.h | 71 |
3 files changed, 56 insertions, 18 deletions
diff --git a/include/linux/platform_data/spi-mt65xx.h b/include/linux/platform_data/spi-mt65xx.h index f0e6d6483e62..65fd5ffd257c 100644 --- a/include/linux/platform_data/spi-mt65xx.h +++ b/include/linux/platform_data/spi-mt65xx.h @@ -11,7 +11,6 @@ /* Board specific platform_data */ struct mtk_chip_config { - u32 cs_pol; u32 sample_sel; }; #endif diff --git a/include/linux/pxa2xx_ssp.h b/include/linux/pxa2xx_ssp.h index a5d1837e4f35..6facf27865f9 100644 --- a/include/linux/pxa2xx_ssp.h +++ b/include/linux/pxa2xx_ssp.h @@ -206,7 +206,7 @@ enum pxa_ssp_type { }; struct ssp_device { - struct platform_device *pdev; + struct device *dev; struct list_head node; struct clk *clk; diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h index 27f6b046cf92..98fe8663033a 100644 --- a/include/linux/spi/spi.h +++ b/include/linux/spi/spi.h @@ -91,6 +91,22 @@ void spi_statistics_add_transfer_stats(struct spi_statistics *stats, SPI_STATISTICS_ADD_TO_FIELD(stats, field, 1) /** + * struct spi_delay - SPI delay information + * @value: Value for the delay + * @unit: Unit for the delay + */ +struct spi_delay { +#define SPI_DELAY_UNIT_USECS 0 +#define SPI_DELAY_UNIT_NSECS 1 +#define SPI_DELAY_UNIT_SCK 2 + u16 value; + u8 unit; +}; + +extern int spi_delay_to_ns(struct spi_delay *_delay, struct spi_transfer *xfer); +extern int spi_delay_exec(struct spi_delay *_delay, struct spi_transfer *xfer); + +/** * struct spi_device - Controller side proxy for an SPI slave device * @dev: Driver model representation of the device. * @controller: SPI controller used with the device. @@ -124,7 +140,7 @@ void spi_statistics_add_transfer_stats(struct spi_statistics *stats, * the spi_master. * @cs_gpiod: gpio descriptor of the chipselect line (optional, NULL when * not using a GPIO line) - * @word_delay_usecs: microsecond delay to be inserted between consecutive + * @word_delay: delay to be inserted between consecutive * words of a transfer * * @statistics: statistics for the spi_device @@ -174,7 +190,7 @@ struct spi_device { const char *driver_override; int cs_gpio; /* LEGACY: chip select gpio */ struct gpio_desc *cs_gpiod; /* chip select gpio desc */ - uint8_t word_delay_usecs; /* inter-word delay */ + struct spi_delay word_delay; /* inter-word delay */ /* the statistics */ struct spi_statistics statistics; @@ -391,6 +407,11 @@ static inline void spi_unregister_driver(struct spi_driver *sdrv) * controller has native support for memory like operations. * @unprepare_message: undo any work done by prepare_message(). * @slave_abort: abort the ongoing transfer request on an SPI slave controller + * @cs_setup: delay to be introduced by the controller after CS is asserted + * @cs_hold: delay to be introduced by the controller before CS is deasserted + * @cs_inactive: delay to be introduced by the controller after CS is + * deasserted. If @cs_change_delay is used from @spi_transfer, then the + * two delays will be added up. * @cs_gpios: LEGACY: array of GPIO descs to use as chip select lines; one per * CS number. Any individual value may be -ENOENT for CS lines that * are not GPIOs (driven by the SPI controller itself). Use the cs_gpiods @@ -509,8 +530,8 @@ struct spi_controller { * to configure specific CS timing through spi_set_cs_timing() after * spi_setup(). */ - void (*set_cs_timing)(struct spi_device *spi, u8 setup_clk_cycles, - u8 hold_clk_cycles, u8 inactive_clk_cycles); + int (*set_cs_timing)(struct spi_device *spi, struct spi_delay *setup, + struct spi_delay *hold, struct spi_delay *inactive); /* bidirectional bulk transfers * @@ -594,6 +615,11 @@ struct spi_controller { /* Optimized handlers for SPI memory-like operations. */ const struct spi_controller_mem_ops *mem_ops; + /* CS delays */ + struct spi_delay cs_setup; + struct spi_delay cs_hold; + struct spi_delay cs_inactive; + /* gpio chip select */ int *cs_gpios; struct gpio_desc **cs_gpiods; @@ -763,13 +789,13 @@ extern void spi_res_release(struct spi_controller *ctlr, * @cs_change: affects chipselect after this transfer completes * @cs_change_delay: delay between cs deassert and assert when * @cs_change is set and @spi_transfer is not the last in @spi_message - * @cs_change_delay_unit: unit of cs_change_delay + * @delay: delay to be introduced after this transfer before + * (optionally) changing the chipselect status, then starting + * the next transfer or completing this @spi_message. * @delay_usecs: microseconds to delay after this transfer before * (optionally) changing the chipselect status, then starting * the next transfer or completing this @spi_message. - * @word_delay_usecs: microseconds to inter word delay after each word size - * (set by bits_per_word) transmission. - * @word_delay: clock cycles to inter word delay after each word size + * @word_delay: inter word delay to be introduced after each word size * (set by bits_per_word) transmission. * @effective_speed_hz: the effective SCK-speed that was used to * transfer this transfer. Set to 0 if the spi bus driver does @@ -883,15 +909,11 @@ struct spi_transfer { #define SPI_NBITS_DUAL 0x02 /* 2bits transfer */ #define SPI_NBITS_QUAD 0x04 /* 4bits transfer */ u8 bits_per_word; - u8 word_delay_usecs; u16 delay_usecs; - u16 cs_change_delay; - u8 cs_change_delay_unit; -#define SPI_DELAY_UNIT_USECS 0 -#define SPI_DELAY_UNIT_NSECS 1 -#define SPI_DELAY_UNIT_SCK 2 + struct spi_delay delay; + struct spi_delay cs_change_delay; + struct spi_delay word_delay; u32 speed_hz; - u16 word_delay; u32 effective_speed_hz; @@ -996,6 +1018,20 @@ spi_transfer_del(struct spi_transfer *t) list_del(&t->transfer_list); } +static inline int +spi_transfer_delay_exec(struct spi_transfer *t) +{ + struct spi_delay d; + + if (t->delay_usecs) { + d.value = t->delay_usecs; + d.unit = SPI_DELAY_UNIT_USECS; + return spi_delay_exec(&d, NULL); + } + + return spi_delay_exec(&t->delay, t); +} + /** * spi_message_init_with_transfers - Initialize spi_message and append transfers * @m: spi_message to be initialized @@ -1043,7 +1079,10 @@ static inline void spi_message_free(struct spi_message *m) kfree(m); } -extern void spi_set_cs_timing(struct spi_device *spi, u8 setup, u8 hold, u8 inactive_dly); +extern int spi_set_cs_timing(struct spi_device *spi, + struct spi_delay *setup, + struct spi_delay *hold, + struct spi_delay *inactive); extern int spi_setup(struct spi_device *spi); extern int spi_async(struct spi_device *spi, struct spi_message *message); |