| 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; |
| } |