[U-Boot Patch v2 2/4] spi: fu540: add claim and release method to spi-sifive.c
Sagar Shrikant Kadam
sagar.kadam at sifive.com
Tue Jan 28 19:02:05 CET 2020
Add missing bus claim/release method to spi driver for HiFive
Unleashed, and handle num_cs generously so that it generates
an error if invalid cs number is passed to sf probe.
Signed-off-by: Sagar Shrikant Kadam <sagar.kadam at sifive.com>
---
drivers/spi/spi-sifive.c | 36 ++++++++++++++++++++++++++++++++++++
1 file changed, 36 insertions(+)
diff --git a/drivers/spi/spi-sifive.c b/drivers/spi/spi-sifive.c
index 969bd4b..f990ad6 100644
--- a/drivers/spi/spi-sifive.c
+++ b/drivers/spi/spi-sifive.c
@@ -186,6 +186,36 @@ static void sifive_spi_tx(struct sifive_spi *spi, const u8 *tx_ptr)
writel(tx_data, spi->regs + SIFIVE_SPI_REG_TXDATA);
}
+static int sifive_spi_claim_bus(struct udevice *dev)
+{
+ int ret;
+ struct udevice *bus = dev->parent;
+ struct sifive_spi *spi = dev_get_priv(bus);
+ struct dm_spi_slave_platdata *slave = dev_get_parent_platdata(dev);
+
+ if (!(slave->cs < spi->num_cs)) {
+ printf("Invalid cs number = %d\n", slave->cs);
+ return -EINVAL;
+ }
+
+ sifive_spi_prep_device(spi, slave);
+
+ ret = sifive_spi_set_cs(spi, slave);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+static int sifive_spi_release_bus(struct udevice *dev)
+{
+ struct sifive_spi *spi = dev_get_priv(dev->parent);
+
+ sifive_spi_clear_cs(spi);
+
+ return 0;
+}
+
static int sifive_spi_xfer(struct udevice *dev, unsigned int bitlen,
const void *dout, void *din, unsigned long flags)
{
@@ -345,6 +375,10 @@ static int sifive_spi_probe(struct udevice *bus)
/* init the sifive spi hw */
sifive_spi_init_hw(spi);
+ /* Fetch number of chip selects from DT if present */
+ ret = dev_read_u32_default(bus, "num-cs", spi->num_cs);
+ spi->num_cs = ret;
+
return 0;
}
@@ -353,6 +387,8 @@ static const struct dm_spi_ops sifive_spi_ops = {
.set_speed = sifive_spi_set_speed,
.set_mode = sifive_spi_set_mode,
.cs_info = sifive_spi_cs_info,
+ .claim_bus = sifive_spi_claim_bus,
+ .release_bus = sifive_spi_release_bus,
};
static const struct udevice_id sifive_spi_ids[] = {
--
2.7.4
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