diff options
Diffstat (limited to 'drivers/spi')
| -rw-r--r-- | drivers/spi/Kconfig | 18 | ||||
| -rw-r--r-- | drivers/spi/ath79_spi.c | 2 | ||||
| -rw-r--r-- | drivers/spi/bcm63xx_hsspi.c | 2 | ||||
| -rw-r--r-- | drivers/spi/bcm63xx_spi.c | 2 | ||||
| -rw-r--r-- | drivers/spi/designware_spi.c | 16 | ||||
| -rw-r--r-- | drivers/spi/sandbox_spi.c | 2 | ||||
| -rw-r--r-- | drivers/spi/spi-uclass.c | 7 | ||||
| -rw-r--r-- | drivers/spi/tegra20_sflash.c | 2 |
8 files changed, 41 insertions, 10 deletions
diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig index b8ca2bdedd5..7be867d5b66 100644 --- a/drivers/spi/Kconfig +++ b/drivers/spi/Kconfig @@ -1,5 +1,22 @@ menuconfig SPI bool "SPI Support" + help + The "Serial Peripheral Interface" is a low level synchronous + protocol. Chips that support SPI can have data transfer rates + up to several tens of Mbit/sec. Chips are addressed with a + controller and a chipselect. Most SPI slaves don't support + dynamic device discovery; some are even write-only or read-only. + + SPI is widely used by microcontrollers to talk with sensors, + eeprom and flash memory, codecs and various other controller + chips, analog to digital (and d-to-a) converters, and more. + MMC and SD cards can be accessed using SPI protocol; and for + DataFlash cards used in MMC sockets, SPI must always be used. + + SPI is one of a family of similar protocols using a four wire + interface (select, clock, data in, data out) including Microwire + (half duplex), SSP, SSI, and PSP. This driver framework should + work with most such devices and controllers. if SPI @@ -243,6 +260,7 @@ config SPI_SIFIVE config SPI_SUNXI bool "Allwinner SoC SPI controllers" + default ARCH_SUNXI help Enable the Allwinner SoC SPi controller driver. diff --git a/drivers/spi/ath79_spi.c b/drivers/spi/ath79_spi.c index 4fd3c050e8e..207069218f6 100644 --- a/drivers/spi/ath79_spi.c +++ b/drivers/spi/ath79_spi.c @@ -198,7 +198,7 @@ static int ath79_cs_info(struct udevice *bus, uint cs, { /* Always allow activity on CS 0/1/2 */ if (cs >= 3) - return -ENODEV; + return -EINVAL; return 0; } diff --git a/drivers/spi/bcm63xx_hsspi.c b/drivers/spi/bcm63xx_hsspi.c index e82b80c107c..529adfbc4e6 100644 --- a/drivers/spi/bcm63xx_hsspi.c +++ b/drivers/spi/bcm63xx_hsspi.c @@ -108,7 +108,7 @@ static int bcm63xx_hsspi_cs_info(struct udevice *bus, uint cs, if (cs >= priv->num_cs) { printf("no cs %u\n", cs); - return -ENODEV; + return -EINVAL; } return 0; diff --git a/drivers/spi/bcm63xx_spi.c b/drivers/spi/bcm63xx_spi.c index 4d19e03523f..69f88c9e087 100644 --- a/drivers/spi/bcm63xx_spi.c +++ b/drivers/spi/bcm63xx_spi.c @@ -130,7 +130,7 @@ static int bcm63xx_spi_cs_info(struct udevice *bus, uint cs, if (cs >= priv->num_cs) { printf("no cs %u\n", cs); - return -ENODEV; + return -EINVAL; } return 0; diff --git a/drivers/spi/designware_spi.c b/drivers/spi/designware_spi.c index 7d58cfae55e..91e613e9cd6 100644 --- a/drivers/spi/designware_spi.c +++ b/drivers/spi/designware_spi.c @@ -518,8 +518,22 @@ static int dw_spi_set_mode(struct udevice *bus, uint mode) static int dw_spi_remove(struct udevice *bus) { struct dw_spi_priv *priv = dev_get_priv(bus); + int ret; + + ret = reset_release_bulk(&priv->resets); + if (ret) + return ret; - return reset_release_bulk(&priv->resets); +#if CONFIG_IS_ENABLED(CLK) + ret = clk_disable(&priv->clk); + if (ret) + return ret; + + ret = clk_free(&priv->clk); + if (ret) + return ret; +#endif + return 0; } static const struct dm_spi_ops dw_spi_ops = { diff --git a/drivers/spi/sandbox_spi.c b/drivers/spi/sandbox_spi.c index 906401ec8ab..16473ec7a0b 100644 --- a/drivers/spi/sandbox_spi.c +++ b/drivers/spi/sandbox_spi.c @@ -117,7 +117,7 @@ static int sandbox_cs_info(struct udevice *bus, uint cs, { /* Always allow activity on CS 0 */ if (cs >= 1) - return -ENODEV; + return -EINVAL; return 0; } diff --git a/drivers/spi/spi-uclass.c b/drivers/spi/spi-uclass.c index a4d1b65682d..947516073ea 100644 --- a/drivers/spi/spi-uclass.c +++ b/drivers/spi/spi-uclass.c @@ -261,11 +261,10 @@ int spi_cs_info(struct udevice *bus, uint cs, struct spi_cs_info *info) return ops->cs_info(bus, cs, info); /* - * We could assume there is at least one valid chip select, but best - * to be sure and return an error in this case. The driver didn't - * care enough to tell us. + * We could assume there is at least one valid chip select. + * The driver didn't care enough to tell us. */ - return -ENODEV; + return 0; } int spi_find_bus_and_cs(int busnum, int cs, struct udevice **busp, diff --git a/drivers/spi/tegra20_sflash.c b/drivers/spi/tegra20_sflash.c index a54b10fdebf..567e33f156a 100644 --- a/drivers/spi/tegra20_sflash.c +++ b/drivers/spi/tegra20_sflash.c @@ -78,7 +78,7 @@ int tegra20_sflash_cs_info(struct udevice *bus, unsigned int cs, { /* Tegra20 SPI-Flash - only 1 device ('bus/cs') */ if (cs != 0) - return -ENODEV; + return -EINVAL; else return 0; } |