diff options
| author | Jonas Gorski <jonas.gorski@gmail.com> | 2025-09-15 20:37:20 +0200 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2025-09-22 09:29:41 +0100 |
| commit | 099f942182e3695554cba44e4bafb08a4111b50f (patch) | |
| tree | 4459749346ceb7ca82e1a58e13abcfb96416f9a1 /include/linux | |
| parent | 188f63235bcdd207646773a8739387d85347ed76 (diff) | |
spi: keep track of number of chipselects in spi_device
There are several places where we need to iterate over a device's
chipselect. To be able to do it efficiently, store the number of
chipselects in spi_device, like we do for controllers.
Since we now use a device supplied value, add a check to make sure it
isn't more than we can support.
Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>
Link: https://patch.msgid.link/20250915183725.219473-3-jonas.gorski@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/spi/spi.h | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h index e9ea43234d9a..49c048277e97 100644 --- a/include/linux/spi/spi.h +++ b/include/linux/spi/spi.h @@ -170,6 +170,7 @@ extern void spi_transfer_cs_change_delay_exec(struct spi_message *msg, * two delays will be added up. * @chip_select: Array of physical chipselect, spi->chipselect[i] gives * the corresponding physical CS for logical CS i. + * @num_chipselect: Number of physical chipselects used. * @cs_index_mask: Bit mask of the active chipselect(s) in the chipselect array * @cs_gpiod: Array of GPIO descriptors of the corresponding chipselect lines * (optional, NULL when not using a GPIO line) @@ -229,6 +230,7 @@ struct spi_device { struct spi_delay cs_inactive; u8 chip_select[SPI_CS_CNT_MAX]; + u8 num_chipselect; /* * Bit mask of the chipselect(s) that the driver need to use from @@ -315,7 +317,7 @@ static inline bool spi_is_csgpiod(struct spi_device *spi) { u8 idx; - for (idx = 0; idx < SPI_CS_CNT_MAX; idx++) { + for (idx = 0; idx < spi->num_chipselect; idx++) { if (spi_get_csgpiod(spi, idx)) return true; } |