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

   1 From 671c3bf50ae498dc12aef6c70abe5cfa066b1348 Mon Sep 17 00:00:00 2001
   2 From: Chuanhong Guo <gch981213@gmail.com>
   3 Date: Fri, 6 Mar 2020 16:50:49 +0800
   4 Subject: [PATCH 1/2] spi: make spi-max-frequency optional
   5
   6 We only need a spi-max-frequency when we specifically request a
   7 spi frequency lower than the max speed of spi host.
   8 This property is already documented as optional property and current
   9 host drivers are implemented to operate at highest speed possible
  10 when spi->max_speed_hz is 0.
  11 This patch makes spi-max-frequency an optional property so that
  12 we could just omit it to use max controller speed.
  13
  14 Signed-off-by: Chuanhong Guo <gch981213@gmail.com>
  15 Link: https://lore.kernel.org/r/20200306085052.28258-2-gch981213@gmail.com
  16 Signed-off-by: Mark Brown <broonie@kernel.org>
  17 ---
  18  drivers/spi/spi.c | 9 ++-------
  19  1 file changed, 2 insertions(+), 7 deletions(-)
  20
  21 --- a/drivers/spi/spi.c
  22 +++ b/drivers/spi/spi.c
  23 @@ -1802,13 +1802,8 @@ static int of_spi_parse_dt(struct spi_co
  24                 spi->mode |= SPI_CS_HIGH;
  25
  26         /* Device speed */
  27 -       rc = of_property_read_u32(nc, "spi-max-frequency", &value);
  28 -       if (rc) {
  29 -               dev_err(&ctlr->dev,
  30 -                       "%pOF has no valid 'spi-max-frequency' property (%d)\n", nc, rc);
  31 -               return rc;
  32 -       }
  33 -       spi->max_speed_hz = value;
  34 +       if (!of_property_read_u32(nc, "spi-max-frequency", &value))
  35 +               spi->max_speed_hz = value;
  36
  37         return 0;
  38  }