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spi: pxa2xx: Get rid of unused enable_loopback member 

There is no user of the enable_loopback member in the struct pxa2xx_spi_chip.
Remote this legacy member completely.

The mentioned in the documentation the testing phase can be performed with
spidev_test tool.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20211123192723.44537-3-andriy.shevchenko@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Andy Shevchenko 2021-11-23 21:27:23 +02:00 committed by Mark Brown
parent a9c8f68ce2
commit 8393961c53
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
3 changed files with 2 additions and 10 deletions
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6
Documentation/spi/pxa2xx.rst
View File

@ -101,7 +101,6 @@ device. All fields are optional.
u8 rx_threshold;
u8 dma_burst_size;
u32 timeout;
u8 enable_loopback;
int gpio_cs;
};
@ -128,11 +127,6 @@ dependent on the SPI bus speed ("spi_board_info.max_speed_hz") and the specific
slave device. Please note that the PXA2xx SSP 1 does not support trailing byte
timeouts and must busy-wait any trailing bytes.
The "pxa2xx_spi_chip.enable_loopback" field is used to place the SSP porting
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.
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)

5
drivers/spi/spi-pxa2xx.c
View File

@ -1289,7 +1289,6 @@ static int setup(struct spi_device *spi)
chip_info = spi->controller_data;
/* chip_info isn't always needed */
chip->cr1 = 0;
if (chip_info) {
if (chip_info->timeout)
chip->timeout = chip_info->timeout;
@ -1300,9 +1299,9 @@ static int setup(struct spi_device *spi)
if (chip_info->rx_threshold)
rx_thres = chip_info->rx_threshold;
chip->dma_threshold = 0;
if (chip_info->enable_loopback)
chip->cr1 = SSCR1_LBM;
}
chip->cr1 = 0;
if (spi_controller_is_slave(drv_data->controller)) {
chip->cr1 |= SSCR1_SCFR;
chip->cr1 |= SSCR1_SCLKDIR;

1
include/linux/spi/pxa2xx_spi.h
View File

@ -42,7 +42,6 @@ struct pxa2xx_spi_chip {
u8 rx_threshold;
u8 dma_burst_size;
u32 timeout;
u8 enable_loopback;
int gpio_cs;
};