diff options
Diffstat (limited to 'Documentation/spi')
| -rw-r--r-- | Documentation/spi/pxa2xx.rst | 29 |
1 files changed, 3 insertions, 26 deletions
diff --git a/Documentation/spi/pxa2xx.rst b/Documentation/spi/pxa2xx.rst index 6312968acfe9..dfc7673ed15d 100644 --- a/Documentation/spi/pxa2xx.rst +++ b/Documentation/spi/pxa2xx.rst @@ -102,7 +102,7 @@ device. All fields are optional. u8 dma_burst_size; u32 timeout; u8 enable_loopback; - void (*cs_control)(u32 command); + int gpio_cs; }; The "pxa2xx_spi_chip.tx_threshold" and "pxa2xx_spi_chip.rx_threshold" fields are @@ -133,11 +133,6 @@ into internal loopback mode. In this mode the SSP controller internally connects the SSPTX pin to the SSPRX pin. This is useful for initial setup testing. -The "pxa2xx_spi_chip.cs_control" field is used to point to a board specific -function for asserting/deasserting a slave device chip select. If the field is -NULL, the pxa2xx_spi master controller driver assumes that the SSP port is -configured to use GPIO or SSPFRM instead. - NOTE: the SPI driver cannot control the chip select if SSPFRM is used, so the chipselect is dropped after each spi_transfer. Most devices need chip select asserted around the complete message. Use SSPFRM as a GPIO (through a descriptor) @@ -152,30 +147,12 @@ field. Below is a sample configuration using the PXA255 NSSP. :: - /* Chip Select control for the CS8415A SPI slave device */ - static void cs8415a_cs_control(u32 command) - { - if (command & PXA2XX_CS_ASSERT) - GPCR(2) = GPIO_bit(2); - else - GPSR(2) = GPIO_bit(2); - } - - /* Chip Select control for the CS8405A SPI slave device */ - static void cs8405a_cs_control(u32 command) - { - if (command & PXA2XX_CS_ASSERT) - GPCR(3) = GPIO_bit(3); - else - GPSR(3) = GPIO_bit(3); - } - static struct pxa2xx_spi_chip cs8415a_chip_info = { .tx_threshold = 8, /* SSP hardward FIFO threshold */ .rx_threshold = 8, /* SSP hardward FIFO threshold */ .dma_burst_size = 8, /* Byte wide transfers used so 8 byte bursts */ .timeout = 235, /* See Intel documentation */ - .cs_control = cs8415a_cs_control, /* Use external chip select */ + .gpio_cs = 2, /* Use external chip select */ }; static struct pxa2xx_spi_chip cs8405a_chip_info = { @@ -183,7 +160,7 @@ field. Below is a sample configuration using the PXA255 NSSP. .rx_threshold = 8, /* SSP hardward FIFO threshold */ .dma_burst_size = 8, /* Byte wide transfers used so 8 byte bursts */ .timeout = 235, /* See Intel documentation */ - .cs_control = cs8405a_cs_control, /* Use external chip select */ + .gpio_cs = 3, /* Use external chip select */ }; static struct spi_board_info streetracer_spi_board_info[] __initdata = { |