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spi: make spi-max-frequency optional

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We only need a spi-max-frequency when we specifically request a
spi frequency lower than the max speed of spi host.
This property is already documented as optional property and current
host drivers are implemented to operate at highest speed possible
when spi->max_speed_hz is 0.
This patch makes spi-max-frequency an optional property so that
we could just omit it to use max controller speed.

Signed-off-by: Chuanhong Guo <gch981213@gmail.com>
Link: https://lore.kernel.org/r/20200306085052.28258-2-gch981213@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Chuanhong Guo 2020-03-06 16:50:49 +08:00 committed by Mark Brown
parent bb6d3fb354
commit 671c3bf50a
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1 changed files with 2 additions and 7 deletions
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9
drivers/spi/spi.c
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@ -1955,13 +1955,8 @@ static int of_spi_parse_dt(struct spi_controller *ctlr, struct spi_device *spi,
spi->mode |= SPI_CS_HIGH;
/* Device speed */
rc = of_property_read_u32(nc, "spi-max-frequency", &value);
if (rc) {
dev_err(&ctlr->dev,
"%pOF has no valid 'spi-max-frequency' property (%d)\n", nc, rc);
return rc;
}
spi->max_speed_hz = value;
if (!of_property_read_u32(nc, "spi-max-frequency", &value))
spi->max_speed_hz = value;
return 0;
}