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| author | Patrick Delaunay <patrick.delaunay@st.com> | 2019-02-27 15:36:44 +0100 |
|---|---|---|
| committer | Jagan Teki <jagan@amarulasolutions.com> | 2019-04-12 11:54:50 +0530 |
| commit | b0cc1b846fcb310c0ac2f8cbeb4ed5947dc52912 (patch) | |
| tree | 7d112ac9bc6474fe26d616721e49d672b9413f51 /include/spi.h | |
| parent | f909ddb3e1770a5ef18606b46000e0d3eaf63b2e (diff) | |
| download | u-boot-b0cc1b846fcb310c0ac2f8cbeb4ed5947dc52912.tar.gz u-boot-b0cc1b846fcb310c0ac2f8cbeb4ed5947dc52912.tar.bz2 u-boot-b0cc1b846fcb310c0ac2f8cbeb4ed5947dc52912.zip | |
dm: spi: Read default speed and mode values from DT
This patch update the behavior introduced by
commit 96907c0fe50a ("dm: spi: Read default speed and mode values from DT")
In case of DT boot, don't read default speed and mode for SPI from
CONFIG_* but instead read from DT node. This will make sure that boards
with multiple SPI/QSPI controllers can be probed at different
bus frequencies and SPI modes.
Remove also use in boards of the value speed=0 (no more supported)
for ENV in SPI by using CONFIG_ENV_SPI_MAX_HZ=0.
DT values will be always used when available (full DM support of
SPI slave with available DT node) even if speed and mode are requested;
for example in splash screen support (in splash_sf_read_raw)
or in SPL boot (in spl_spi_load_image).
The caller of spi_get_bus_and_cs() no more need to force speed=0.
But the current behavior don't change if the SPI slave is not
present (device with generic driver is created automatically)
or if platdata is used (CONFIG_OF_PLATDATA).
Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
Acked-by: Jagan Teki <jagan@amarulasolutions.com>
Diffstat (limited to 'include/spi.h')
| -rw-r--r-- | include/spi.h | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/include/spi.h b/include/spi.h index 92427e5f32..378594163b 100644 --- a/include/spi.h +++ b/include/spi.h @@ -496,14 +496,15 @@ int spi_find_bus_and_cs(int busnum, int cs, struct udevice **busp, * device and slave device. * * If no such slave exists, and drv_name is not NULL, then a new slave device - * is automatically bound on this chip select. + * is automatically bound on this chip select with requested speed and mode. * - * Ths new slave device is probed ready for use with the given speed and mode. + * Ths new slave device is probed ready for use with the speed and mode + * from platdata when available or the requested values. * * @busnum: SPI bus number * @cs: Chip select to look for - * @speed: SPI speed to use for this slave - * @mode: SPI mode to use for this slave + * @speed: SPI speed to use for this slave when not available in platdata + * @mode: SPI mode to use for this slave when not available in platdata * @drv_name: Name of driver to attach to this chip select * @dev_name: Name of the new device thus created * @busp: Returns bus device |