Commit b4e27545 authored by Guenter Roeck's avatar Guenter Roeck Committed by Mark Brown

spi: sc18is602: Support multiple devices on a single I2C bus if DT is configured

The driver currently only supports a single device per I2C bus since it uses
the I2C bus number to set the SPI bus number. This makes it impossible to
connect more than one chip to a single I2C bus.

We don't want to use dynamic bus numbers unconditionally since this would
result in every instantiation getting a different bus number starting with
65,535 counting down unless devicetree is configured. If devicetree is
configured, however, the SPI bus number is obtained from devicetree
data. So we can use dynamic SPI bus numbers in this case.
Reported-and-Tested-by: default avatarMarco Menchise <marco.menchise@gmail.com>
Signed-off-by: default avatarGuenter Roeck <linux@roeck-us.net>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent bfa76d49
......@@ -290,7 +290,7 @@ static int sc18is602_probe(struct i2c_client *client,
hw->freq = SC18IS602_CLOCK;
break;
}
master->bus_num = client->adapter->nr;
master->bus_num = np ? -1 : client->adapter->nr;
master->mode_bits = SPI_CPHA | SPI_CPOL | SPI_LSB_FIRST;
master->bits_per_word_mask = SPI_BPW_MASK(8);
master->setup = sc18is602_setup;
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment