Le 14/01/2021 à 12:59, Mark Brown a écrit :
On Thu, Jan 14, 2021 at 12:27:42PM +0100, Christophe Leroy wrote:
Today I have in the DTS the CS GPIOs declared as ACTIVE_LOW.
If I declare them as ACTIVE_HIGH instead, then I also have to set
spi-cs-high property, otherwise of_gpio_flags_quirks() is not happy and
forces the GPIO ACTIVE LOW.
When I set spi-cs-high property, it sets the SPI_CS_HIGH bit in spi->mode.
OK, so it sounds like you want SPI_CS_HIGH and that is being set
correctly?
In fsl_spi_chipselect(), we have
bool pol = spi->mode & SPI_CS_HIGH
Then
pdata->cs_control(spi, pol);
So changing the board config is compensated by the above, and at the end it still doesn't work.
This is a driver bug, the driver set_cs() operation should not be
modifying the value it is told to set.
A driver bug ? Or maybe a change forgotten in commit 766c6b63aa04 ("spi: fix client driver
breakages when using GPIO descriptors") ?
I'm almost sure it was not a bug, it is in line which what is said in the comment removed by the
above mentionned commit.
I'll send a fix.
Christophe
