diff options
| author | Andy Shevchenko <andriy.shevchenko@linux.intel.com> | 2024-04-15 21:31:19 +0200 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2024-04-16 01:45:12 +0200 |
| commit | e81582c080ddec3359bc6726291e62a1ba8b7350 (patch) | |
| tree | 1dea2f62663c8e4bb90b528a495c6ec86ae8eefe /drivers | |
| parent | spi: pxa2xx: Move number of CS pins validation out of condition (diff) | |
| download | linux-e81582c080ddec3359bc6726291e62a1ba8b7350.tar.xz linux-e81582c080ddec3359bc6726291e62a1ba8b7350.zip | |
spi: Extract spi_toggle_csgpiod() helper for better maintanance
The multi-CS support splits the comment and the code in the spi_set_cs().
To avoid this in the future extract spi_toggle_csgpiod() helper.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20240415193340.1279360-2-andriy.shevchenko@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/spi/spi.c | 49 |
1 files changed, 25 insertions, 24 deletions
diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c index a2f01116ba09..63abe4320ab4 100644 --- a/drivers/spi/spi.c +++ b/drivers/spi/spi.c @@ -1036,6 +1036,29 @@ static inline bool spi_is_last_cs(struct spi_device *spi) return last; } +static void spi_toggle_csgpiod(struct spi_device *spi, u8 idx, bool enable, bool activate) +{ + /* + * Historically ACPI has no means of the GPIO polarity and + * thus the SPISerialBus() resource defines it on the per-chip + * basis. In order to avoid a chain of negations, the GPIO + * polarity is considered being Active High. Even for the cases + * when _DSD() is involved (in the updated versions of ACPI) + * the GPIO CS polarity must be defined Active High to avoid + * ambiguity. That's why we use enable, that takes SPI_CS_HIGH + * into account. + */ + if (has_acpi_companion(&spi->dev)) + gpiod_set_value_cansleep(spi_get_csgpiod(spi, idx), !enable); + else + /* Polarity handled by GPIO library */ + gpiod_set_value_cansleep(spi_get_csgpiod(spi, idx), activate); + + if (activate) + spi_delay_exec(&spi->cs_setup, NULL); + else + spi_delay_exec(&spi->cs_inactive, NULL); +} static void spi_set_cs(struct spi_device *spi, bool enable, bool force) { @@ -1072,31 +1095,9 @@ static void spi_set_cs(struct spi_device *spi, bool enable, bool force) if (spi_is_csgpiod(spi)) { if (!(spi->mode & SPI_NO_CS)) { - /* - * Historically ACPI has no means of the GPIO polarity and - * thus the SPISerialBus() resource defines it on the per-chip - * basis. In order to avoid a chain of negations, the GPIO - * polarity is considered being Active High. Even for the cases - * when _DSD() is involved (in the updated versions of ACPI) - * the GPIO CS polarity must be defined Active High to avoid - * ambiguity. That's why we use enable, that takes SPI_CS_HIGH - * into account. - */ for (idx = 0; idx < SPI_CS_CNT_MAX; idx++) { - if ((spi->cs_index_mask & BIT(idx)) && spi_get_csgpiod(spi, idx)) { - if (has_acpi_companion(&spi->dev)) - gpiod_set_value_cansleep(spi_get_csgpiod(spi, idx), - !enable); - else - /* Polarity handled by GPIO library */ - gpiod_set_value_cansleep(spi_get_csgpiod(spi, idx), - activate); - - if (activate) - spi_delay_exec(&spi->cs_setup, NULL); - else - spi_delay_exec(&spi->cs_inactive, NULL); - } + if ((spi->cs_index_mask & BIT(idx)) && spi_get_csgpiod(spi, idx)) + spi_toggle_csgpiod(spi, idx, enable, activate); } } /* Some SPI masters need both GPIO CS & slave_select */ |