2020-03-20 11:26:45 +00:00
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From 671c3bf50ae498dc12aef6c70abe5cfa066b1348 Mon Sep 17 00:00:00 2001
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From: Chuanhong Guo <gch981213@gmail.com>
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Date: Fri, 6 Mar 2020 16:50:49 +0800
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Subject: [PATCH 1/2] spi: make spi-max-frequency optional
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We only need a spi-max-frequency when we specifically request a
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spi frequency lower than the max speed of spi host.
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This property is already documented as optional property and current
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host drivers are implemented to operate at highest speed possible
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when spi->max_speed_hz is 0.
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This patch makes spi-max-frequency an optional property so that
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we could just omit it to use max controller speed.
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Signed-off-by: Chuanhong Guo <gch981213@gmail.com>
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Link: https://lore.kernel.org/r/20200306085052.28258-2-gch981213@gmail.com
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Signed-off-by: Mark Brown <broonie@kernel.org>
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---
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drivers/spi/spi.c | 9 ++-------
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1 file changed, 2 insertions(+), 7 deletions(-)
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--- a/drivers/spi/spi.c
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+++ b/drivers/spi/spi.c
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2020-09-23 12:39:37 +00:00
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@@ -1802,13 +1802,8 @@ static int of_spi_parse_dt(struct spi_co
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2020-03-20 11:26:45 +00:00
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spi->mode |= SPI_CS_HIGH;
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/* Device speed */
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- rc = of_property_read_u32(nc, "spi-max-frequency", &value);
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- if (rc) {
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- dev_err(&ctlr->dev,
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- "%pOF has no valid 'spi-max-frequency' property (%d)\n", nc, rc);
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- return rc;
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- }
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- spi->max_speed_hz = value;
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+ if (!of_property_read_u32(nc, "spi-max-frequency", &value))
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+ spi->max_speed_hz = value;
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return 0;
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}
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