Unverified Commit 671c3bf5 authored Mar 06, 2020 by Chuanhong Guo Committed by Mark Brown Mar 11, 2020

spi: make spi-max-frequency optional



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>

parent bb6d3fb3

drivers/spi/spi.c

+2 −7

Original line number	Diff line number	Diff line
		@@ -1955,12 +1955,7 @@ 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;
		}
		if (!of_property_read_u32(nc, "spi-max-frequency", &value))
		spi->max_speed_hz = value;

		return 0;

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