Fix for BPI-R64

root/target/linux/mediatek/patches-5.4/0001-v5.7-spi-make-spi-max-frequency-optional.patch

@@ -0,0 +1,38 @@
+From 671c3bf50ae498dc12aef6c70abe5cfa066b1348 Mon Sep 17 00:00:00 2001
+From: Chuanhong Guo <gch981213@gmail.com>
+Date: Fri, 6 Mar 2020 16:50:49 +0800
+Subject: [PATCH 1/2] 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>
+---
+ drivers/spi/spi.c | 9 ++-------
+ 1 file changed, 2 insertions(+), 7 deletions(-)
+
+--- a/drivers/spi/spi.c
++++ b/drivers/spi/spi.c
+@@ -1809,13 +1809,8 @@ static int of_spi_parse_dt(struct spi_co
+ 		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;
+ }