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[V3,7/9] spi: bcm2835aux: setup gpio-cs to output and correct level during setup

Message ID 20190330093106.20723-8-kernel@martin.sperl.org (mailing list archive)
State New, archived
Headers show
Series spi: bcm2835aux: bug fixes and improvements | expand

Commit Message

Martin Sperl March 30, 2019, 9:31 a.m. UTC 
From: Martin Sperl <kernel@martin.sperl.org>

Setup gpio-cs to the correct levels during setup and also make the
gpio definitely an output GPIO.

This is transparently fixing some badly configured DTs in the process
where cs-gpio is set but the gpios are still configured with native cs.

It also makes 100% sure that the initial CS levels are as expected -
especially on systems with devices on a bus with mixed CS_HIGH/CS_LOW
settings.

Fixes: 1ea29b39f4c812ec ("spi: bcm2835aux: add bcm2835 auxiliary spi device...")

Signed-off-by: Martin Sperl <kernel@martin.sperl.org>

---

Changelog:
  V2 -> V3: rebased duo to changes in Patch 6

 drivers/spi/spi-bcm2835aux.c | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

--
2.11.0
diff mbox series

Patch

diff --git a/drivers/spi/spi-bcm2835aux.c b/drivers/spi/spi-bcm2835aux.c
index a105db371417..99414319001a 100644
--- a/drivers/spi/spi-bcm2835aux.c
+++ b/drivers/spi/spi-bcm2835aux.c
@@ -403,8 +403,20 @@  static int bcm2835aux_spi_setup(struct spi_device *spi)
 	/* sanity check for native cs */
 	if (spi->mode & SPI_NO_CS)
 		return 0;
-	if (gpio_is_valid(spi->cs_gpio))
-		return 0;
+	if (gpio_is_valid(spi->cs_gpio)) {
+		/* with gpio-cs set the GPIO to the correct level
+		 * and as output (in case the dt has the gpio not configured
+		 * as output but native cs)
+		 */
+		ret = gpio_direction_output(spi->cs_gpio,
+					    (spi->mode & SPI_CS_HIGH) ? 0 : 1);
+		if (ret)
+			dev_err(&spi->dev,
+				"could not set gpio %i as output: %i\n",
+				spi->cs_gpio, ret);
+
+		return ret;
+	}

 	/* for dt-backwards compatibility: only support native on CS0
 	 * known things not supported with broken native CS: