Signed-off-by: Martin Sperl <[email protected]>
Tested-by: Martin Sperl <[email protected]>
---
drivers/spi/spi-bcm2835.c | 12 ++++++++++++
1 file changed, 12 insertions(+)
Applies against spi - topic/bcm2835
Could get replaced by something similar to this.
if (!gpio_is_valid(spi->gpio_cs)) {
if (spi->chip_select == 0) {
spi->gpio_cs = 8;
gpio_set_output(spi->gpio_cs);
}
if (spi->chip_select == 1) {
spi->gpio_cs = 7;
gpio_set_output(spi->gpio_cs);
}
}
But I do not know what is the correct call to use.
diff --git a/drivers/spi/spi-bcm2835.c b/drivers/spi/spi-bcm2835.c
index adf157b..601fc5e 100644
--- a/drivers/spi/spi-bcm2835.c
+++ b/drivers/spi/spi-bcm2835.c
@@ -82,6 +82,7 @@ struct bcm2835_spi {
u8 *rx_buf;
int tx_len;
int rx_len;
+ bool native_cs_use_warning_done;
};
static inline u32 bcm2835_rd(struct bcm2835_spi *bs, unsigned reg)
@@ -287,6 +288,9 @@ static void bcm2835_spi_set_cs(struct spi_device *spi, bool
gpio_level)
static int bcm2835_spi_setup(struct spi_device *spi)
{
+ struct spi_master *master = spi->master;
+ struct bcm2835_spi *bs = spi_master_get_devdata(master);
+
/*
* sanity checking the native-chipselects
*/
@@ -294,6 +298,14 @@ static int bcm2835_spi_setup(struct spi_device *spi)
return 0;
if (gpio_is_valid(spi->cs_gpio))
return 0;
+ /* we are in the native chipselect case now,
+ * so warn about the fact that some things may not work as well
+ */
+ if (!bs->native_cs_use_warning_done) {
+ dev_warn(&spi->dev,
+ "setup: native chipselect is used - some driver
functions/optimizations are not applied\n");
+ bs->native_cs_use_warning_done = 1;
+ }
if (spi->chip_select < 3)
return 0;
--
1.7.10.4
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