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spi: atmel: Remove and fix erroneous comments 

Since CSAAT functionality support has been added. Some comments become
wrong. Fix them to match the current driver behavior.

Signed-off-by: Gregory CLEMENT <gregory.clement@bootlin.com>
Link: https://lore.kernel.org/r/20191017141846.7523-2-gregory.clement@bootlin.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Gregory CLEMENT 2019-10-17 16:18:40 +02:00 committed by Mark Brown
parent ae8fbf1d24
commit 4d8672d174
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GPG Key ID: 24D68B725D5487D0
1 changed files with 3 additions and 7 deletions
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10
drivers/spi/spi-atmel.c
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@ -312,11 +312,9 @@ static bool atmel_spi_is_v2(struct atmel_spi *as)
* transmitted") Not so! Workaround uses nCSx pins as GPIOs; or newer
* controllers have CSAAT and friends.
*
* Since the CSAAT functionality is a bit weird on newer controllers as
* well, we use GPIO to control nCSx pins on all controllers, updating
* MR.PCS to avoid confusing the controller. Using GPIOs also lets us
* support active-high chipselects despite the controller's belief that
* only active-low devices/systems exists.
* Even controller newer than ar91rm9200, using GPIOs can make sens as
* it lets us support active-high chipselects despite the controller's
* belief that only active-low devices/systems exists.
*
* However, at91rm9200 has a second erratum whereby nCS0 doesn't work
* right when driven with GPIO. ("Mode Fault does not allow more than one
@ -1193,8 +1191,6 @@ static int atmel_spi_setup(struct spi_device *spi)
if (!as->use_cs_gpios)
csr |= SPI_BIT(CSAAT);
/* DLYBS is mostly irrelevant since we manage chipselect using GPIOs.
*/
csr |= SPI_BF(DLYBS, 0);
word_delay_csr = atmel_word_delay_csr(spi, as);