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Code Issues Releases Wiki Activity

spi: atmel: Improve CS0 case support on AT91RM9200

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Thanks to the recent change in this driver, it is now possible to
prevent using the CS0 with GPIO during setup. It then allows to remove
the special handling of this case in the cs_activate() and
cs_deactivate() functions.

Signed-off-by: Gregory CLEMENT <gregory.clement@bootlin.com>
Link: https://lore.kernel.org/r/20191017141846.7523-8-gregory.clement@bootlin.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Gregory CLEMENT 2019-10-17 16:18:46 +02:00 committed by Mark Brown
parent 57e3137710
commit 9c86f12a36
No known key found for this signature in database
GPG key ID: 24D68B725D5487D0
1 changed files with 12 additions and 3 deletions
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15
drivers/spi/spi-atmel.c
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@ -371,7 +371,7 @@ static void cs_activate(struct atmel_spi *as, struct spi_device *spi)
mr = spi_readl(as, MR);
mr = SPI_BFINS(PCS, ~(1 << chip_select), mr);
if (spi->cs_gpiod && spi->chip_select != 0)
if (spi->cs_gpiod)
gpiod_set_value(spi->cs_gpiod, 1);
spi_writel(as, MR, mr);
}
@ -402,7 +402,7 @@ static void cs_deactivate(struct atmel_spi *as, struct spi_device *spi)
if (!spi->cs_gpiod)
spi_writel(as, CR, SPI_BIT(LASTXFER));
else if (atmel_spi_is_v2(as) || spi->chip_select != 0)
else
gpiod_set_value(spi->cs_gpiod, 0);
}
@ -1193,7 +1193,16 @@ static void initialize_native_cs_for_gpio(struct atmel_spi *as)
if (!master->cs_gpiods)
return; /* No CS GPIO */
for (i = 0; i < 4; i++)
/*
* On the first version of the controller (AT91RM9200), CS0
* can't be used associated with GPIO
*/
if (atmel_spi_is_v2(as))
i = 0;
else
i = 1;
for (; i < 4; i++)
if (master->cs_gpiods[i])
as->native_cs_free |= BIT(i);