Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
spi: omap2-mcspi: add support for 3-wire transfers
Update omap_mcspi_setup_transfer() so that the driver supports
communication over a single data line for 3-wire SPI devices.
Signed-off-by: Antoni Pokusinski <apokusinski01@gmail.com>
Link: https://patch.msgid.link/20260214212800.262461-1-apokusinski01@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>
authored by
Antoni Pokusinski
and committed by
Mark Brown
6f7e9b11
4d28f38f
+12
-5
+12
-5
drivers/spi/spi-omap2-mcspi.c
+12
-5
drivers/spi/spi-omap2-mcspi.c
···
942
942
943
943
l = mcspi_cached_chconf0(spi);
944
944
945
-
/* standard 4-wire host mode: SCK, MOSI/out, MISO/in, nCS
946
-
* REVISIT: this controller could support SPI_3WIRE mode.
947
-
*/
948
-
if (mcspi->pin_dir == MCSPI_PINDIR_D0_IN_D1_OUT) {
945
+
if (spi->mode & SPI_3WIRE) {
946
+
if (t && !t->tx_buf) {
947
+
l &= ~OMAP2_MCSPI_CHCONF_IS;
948
+
l |= OMAP2_MCSPI_CHCONF_DPE0;
949
+
} else if (t && !t->rx_buf) {
950
+
l |= OMAP2_MCSPI_CHCONF_IS;
951
+
l &= ~OMAP2_MCSPI_CHCONF_DPE0;
952
+
}
953
+
l |= OMAP2_MCSPI_CHCONF_DPE1;
954
+
} else if (mcspi->pin_dir == MCSPI_PINDIR_D0_IN_D1_OUT) {
949
955
l &= ~OMAP2_MCSPI_CHCONF_IS;
950
956
l &= ~OMAP2_MCSPI_CHCONF_DPE1;
951
957
l |= OMAP2_MCSPI_CHCONF_DPE0;
···
1184
1178
omap2_mcspi_set_cs(spi, spi->mode & SPI_CS_HIGH);
1185
1179
1186
1180
if (par_override ||
1181
+
(spi->mode & SPI_3WIRE) ||
1187
1182
(t->speed_hz != spi->max_speed_hz) ||
1188
1183
(t->bits_per_word != spi->bits_per_word)) {
1189
1184
par_override = 1;
···
1491
1484
return -ENOMEM;
1492
1485
1493
1486
/* the spi->mode bits understood by this driver: */
1494
-
ctlr->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH;
1487
+
ctlr->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | SPI_3WIRE;
1495
1488
ctlr->bits_per_word_mask = SPI_BPW_RANGE_MASK(4, 32);
1496
1489
ctlr->setup = omap2_mcspi_setup;
1497
1490
ctlr->auto_runtime_pm = true;