diff options
Diffstat (limited to 'target/linux/mediatek/patches-5.4/0001-v5.7-spi-make-spi-max-frequency-optional.patch')
| -rw-r--r-- | target/linux/mediatek/patches-5.4/0001-v5.7-spi-make-spi-max-frequency-optional.patch | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/target/linux/mediatek/patches-5.4/0001-v5.7-spi-make-spi-max-frequency-optional.patch b/target/linux/mediatek/patches-5.4/0001-v5.7-spi-make-spi-max-frequency-optional.patch new file mode 100644 index 0000000000..d29afc0636 --- /dev/null +++ b/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 +@@ -1785,13 +1785,8 @@ 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; + } |