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dm: spi: Check cs number before accessing slaves

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Add chip select number check in spi_find_chip_select().

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Tested-by: Jagan Teki <jagan@amarulasolutions.com> # SoPine
This commit is contained in:
Bin Meng
2019-09-09 06:00:02 -07:00
committed by Jagan Teki
parent 383fded70c
commit 7bacce524d
2 changed files with 28 additions and 20 deletions
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3
include/spi.h
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@@ -561,7 +561,8 @@ int spi_chip_select(struct udevice *slave);
* @bus: SPI bus to search
* @cs: Chip select to look for
* @devp: Returns the slave device if found
* @return 0 if found, -ENODEV on error
* @return 0 if found, -EINVAL if cs is invalid, -ENODEV if no device attached,
* other -ve value on error
*/
int spi_find_chip_select(struct udevice *bus, int cs, struct udevice **devp);