summaryrefslogtreecommitdiffstats
path: root/drivers/spi
diff options
context:
space:
mode:
authorChris Ruehl <chris.ruehl@gtsys.com.hk>2020-05-11 10:30:22 +0200
committerMark Brown <broonie@kernel.org>2020-05-15 19:50:06 +0200
commiteb1262e3cc8b529218e085254888c90f096a5da5 (patch)
treec26ef97bf88736b057669962bf29394080c99478 /drivers/spi
parentspi: spi-rockchip: add support for spi slave mode (diff)
downloadlinux-eb1262e3cc8b529218e085254888c90f096a5da5.tar.xz
linux-eb1262e3cc8b529218e085254888c90f096a5da5.zip
spi: spi-rockchip: use num-cs property and ctlr->enable_gpiods
The original implementation set num_chipselect to ROCKCHIP_SPI_MAX_CS_NUM (2) which seems wrong here. spi0 has 2 native cs, all others just one. With enable and use of cs_gpiods / GPIO CS, its correct to set the num_chipselect from the num-cs property and set max_native_cs with the define. If num-cs is missing the default set to num_chipselect = 1. Signed-off-by: Chris Ruehl <chris.ruehl@gtsys.com.hk> Link: https://lore.kernel.org/r/20200511083022.23678-4-chris.ruehl@gtsys.com.hk Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/spi')
-rw-r--r--drivers/spi/spi-rockchip.c9
1 files changed, 8 insertions, 1 deletions
diff --git a/drivers/spi/spi-rockchip.c b/drivers/spi/spi-rockchip.c
index f57a8faa6f31..9b8a5e1233c0 100644
--- a/drivers/spi/spi-rockchip.c
+++ b/drivers/spi/spi-rockchip.c
@@ -708,8 +708,15 @@ static int rockchip_spi_probe(struct platform_device *pdev)
ctlr->slave_abort = rockchip_spi_slave_abort;
} else {
ctlr->flags = SPI_MASTER_GPIO_SS;
+ ctlr->max_native_cs = ROCKCHIP_SPI_MAX_CS_NUM;
+ /*
+ * rk spi0 has two native cs, spi1..5 one cs only
+ * if num-cs is missing in the dts, default to 1
+ */
+ if (of_property_read_u16(np, "num-cs", &ctlr->num_chipselect))
+ ctlr->num_chipselect = 1;
+ ctlr->use_gpio_descriptors = true;
}
- ctlr->num_chipselect = ROCKCHIP_SPI_MAX_CS_NUM;
ctlr->dev.of_node = pdev->dev.of_node;
ctlr->bits_per_word_mask = SPI_BPW_MASK(16) | SPI_BPW_MASK(8) | SPI_BPW_MASK(4);
ctlr->min_speed_hz = rs->freq / BAUDR_SCKDV_MAX;