diff mbox

[RFC,1/2] spi: pxa2xx: Convert to GPIO descriptor API where possible

Message ID 6bfd2b29b888c14f1a6feb9dee5bb54b74e761b0.1501760433.git.jan.kiszka@siemens.com (mailing list archive)
State Accepted
Commit c18d925fca20d33c3d04e5002a883f62d699543e
Headers show

Commit Message

Jan Kiszka Aug. 3, 2017, 11:40 a.m. UTC 
From: Jan Kiszka <jan.kiszka@siemens.com>

We still need to request/free GPIOs passed via the legacy path of
pxa2xx_spi_chip::gpio_cs, but we can use the gpiod API otherwise.

Consistently use the descriptor API instead of the legacy one.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
---
 drivers/spi/spi-pxa2xx.c | 32 ++++++++++++++++----------------
 drivers/spi/spi-pxa2xx.h |  2 +-
 2 files changed, 17 insertions(+), 17 deletions(-)

Comments

Mika Westerberg Aug. 4, 2017, 10:10 a.m. UTC | #1 
On Thu, Aug 03, 2017 at 01:40:32PM +0200, Jan Kiszka wrote:
> From: Jan Kiszka <jan.kiszka@siemens.com>
> 
> We still need to request/free GPIOs passed via the legacy path of
> pxa2xx_spi_chip::gpio_cs, but we can use the gpiod API otherwise.
> 
> Consistently use the descriptor API instead of the legacy one.
> 
> Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>

There are some PXA2xx platforms under arch/arm/* which use this driver
and legacy GPIOs. I wonder if this causes any problems with them?

That was one of the reasons I did not convert the whole driver over GPIO
descriptors.
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Jan Kiszka Aug. 4, 2017, 10:18 a.m. UTC | #2 
On 2017-08-04 12:10, Mika Westerberg wrote:
> On Thu, Aug 03, 2017 at 01:40:32PM +0200, Jan Kiszka wrote:
>> From: Jan Kiszka <jan.kiszka@siemens.com>
>>
>> We still need to request/free GPIOs passed via the legacy path of
>> pxa2xx_spi_chip::gpio_cs, but we can use the gpiod API otherwise.
>>
>> Consistently use the descriptor API instead of the legacy one.
>>
>> Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
> 
> There are some PXA2xx platforms under arch/arm/* which use this driver
> and legacy GPIOs. I wonder if this causes any problems with them?
> 
> That was one of the reasons I did not convert the whole driver over GPIO
> descriptors.

It shouldn't cause problems (famous last words) because I refrained from
changing the interfaces to them. References that come in as legacy GPIO
are still treated like that.

Jan
Mika Westerberg Aug. 4, 2017, 10:24 a.m. UTC | #3 
On Fri, Aug 04, 2017 at 12:18:28PM +0200, Jan Kiszka wrote:
> On 2017-08-04 12:10, Mika Westerberg wrote:
> > On Thu, Aug 03, 2017 at 01:40:32PM +0200, Jan Kiszka wrote:
> >> From: Jan Kiszka <jan.kiszka@siemens.com>
> >>
> >> We still need to request/free GPIOs passed via the legacy path of
> >> pxa2xx_spi_chip::gpio_cs, but we can use the gpiod API otherwise.
> >>
> >> Consistently use the descriptor API instead of the legacy one.
> >>
> >> Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
> > 
> > There are some PXA2xx platforms under arch/arm/* which use this driver
> > and legacy GPIOs. I wonder if this causes any problems with them?
> > 
> > That was one of the reasons I did not convert the whole driver over GPIO
> > descriptors.
> 
> It shouldn't cause problems (famous last words) because I refrained from
> changing the interfaces to them. References that come in as legacy GPIO
> are still treated like that.

OK. I hope someone with a PXA2xx machine could still test it.

Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
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Mark Brown Aug. 4, 2017, 11:43 a.m. UTC | #4 
On Fri, Aug 04, 2017 at 01:24:08PM +0300, Mika Westerberg wrote:
> On Fri, Aug 04, 2017 at 12:18:28PM +0200, Jan Kiszka wrote:

> > It shouldn't cause problems (famous last words) because I refrained from
> > changing the interfaces to them. References that come in as legacy GPIO
> > are still treated like that.

> OK. I hope someone with a PXA2xx machine could still test it.

> Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>

This path should be very well covered - there's plenty of things that
convert GPIO numbers into descriptors out there.
diff mbox

Patch

diff --git a/drivers/spi/spi-pxa2xx.c b/drivers/spi/spi-pxa2xx.c
index 38d053682892..7faba738110c 100644
--- a/drivers/spi/spi-pxa2xx.c
+++ b/drivers/spi/spi-pxa2xx.c
@@ -402,8 +402,8 @@  static void cs_assert(struct driver_data *drv_data)
 		return;
 	}
 
-	if (gpio_is_valid(chip->gpio_cs)) {
-		gpio_set_value(chip->gpio_cs, chip->gpio_cs_inverted);
+	if (chip->gpiod_cs) {
+		gpiod_set_value(chip->gpiod_cs, chip->gpio_cs_inverted);
 		return;
 	}
 
@@ -424,8 +424,8 @@  static void cs_deassert(struct driver_data *drv_data)
 		return;
 	}
 
-	if (gpio_is_valid(chip->gpio_cs)) {
-		gpio_set_value(chip->gpio_cs, !chip->gpio_cs_inverted);
+	if (chip->gpiod_cs) {
+		gpiod_set_value(chip->gpiod_cs, !chip->gpio_cs_inverted);
 		return;
 	}
 
@@ -1213,17 +1213,16 @@  static int setup_cs(struct spi_device *spi, struct chip_data *chip,
 		    struct pxa2xx_spi_chip *chip_info)
 {
 	struct driver_data *drv_data = spi_master_get_devdata(spi->master);
+	struct gpio_desc *gpiod;
 	int err = 0;
 
 	if (chip == NULL)
 		return 0;
 
 	if (drv_data->cs_gpiods) {
-		struct gpio_desc *gpiod;
-
 		gpiod = drv_data->cs_gpiods[spi->chip_select];
 		if (gpiod) {
-			chip->gpio_cs = desc_to_gpio(gpiod);
+			chip->gpiod_cs = gpiod;
 			chip->gpio_cs_inverted = spi->mode & SPI_CS_HIGH;
 			gpiod_set_value(gpiod, chip->gpio_cs_inverted);
 		}
@@ -1237,8 +1236,10 @@  static int setup_cs(struct spi_device *spi, struct chip_data *chip,
 	/* NOTE: setup() can be called multiple times, possibly with
 	 * different chip_info, release previously requested GPIO
 	 */
-	if (gpio_is_valid(chip->gpio_cs))
-		gpio_free(chip->gpio_cs);
+	if (chip->gpiod_cs) {
+		gpio_free(desc_to_gpio(chip->gpiod_cs));
+		chip->gpiod_cs = NULL;
+	}
 
 	/* If (*cs_control) is provided, ignore GPIO chip select */
 	if (chip_info->cs_control) {
@@ -1254,11 +1255,11 @@  static int setup_cs(struct spi_device *spi, struct chip_data *chip,
 			return err;
 		}
 
-		chip->gpio_cs = chip_info->gpio_cs;
+		gpiod = gpio_to_desc(chip_info->gpio_cs);
+		chip->gpiod_cs = gpiod;
 		chip->gpio_cs_inverted = spi->mode & SPI_CS_HIGH;
 
-		err = gpio_direction_output(chip->gpio_cs,
-					!chip->gpio_cs_inverted);
+		err = gpiod_direction_output(gpiod, !chip->gpio_cs_inverted);
 	}
 
 	return err;
@@ -1317,8 +1318,7 @@  static int setup(struct spi_device *spi)
 			}
 
 			chip->frm = spi->chip_select;
-		} else
-			chip->gpio_cs = -1;
+		}
 		chip->enable_dma = drv_data->master_info->enable_dma;
 		chip->timeout = TIMOUT_DFLT;
 	}
@@ -1416,8 +1416,8 @@  static void cleanup(struct spi_device *spi)
 		return;
 
 	if (drv_data->ssp_type != CE4100_SSP && !drv_data->cs_gpiods &&
-	    gpio_is_valid(chip->gpio_cs))
-		gpio_free(chip->gpio_cs);
+	    chip->gpiod_cs)
+		gpio_free(desc_to_gpio(chip->gpiod_cs));
 
 	kfree(chip);
 }
diff --git a/drivers/spi/spi-pxa2xx.h b/drivers/spi/spi-pxa2xx.h
index 2823a00a9405..94f7b0713281 100644
--- a/drivers/spi/spi-pxa2xx.h
+++ b/drivers/spi/spi-pxa2xx.h
@@ -83,7 +83,7 @@  struct chip_data {
 	u16 lpss_tx_threshold;
 	u8 enable_dma;
 	union {
-		int gpio_cs;
+		struct gpio_desc *gpiod_cs;
 		unsigned int frm;
 	};
 	int gpio_cs_inverted;