spi: remove spi_set_cs_timing()

No one seems to be using this global and exported function, so remove it
as it is no longer needed.

Cc: Mark Brown <broonie@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Link: https://lore.kernel.org/r/20210609071918.2852069-1-gregkh@linuxfoundation.org
Signed-off-by: Mark Brown <broonie@kernel.org>

drivers/spi/spi.c

@@ -3472,79 +3472,6 @@ int spi_setup(struct spi_device *spi)
 }
 EXPORT_SYMBOL_GPL(spi_setup);
 
-/**
- * spi_set_cs_timing - configure CS setup, hold, and inactive delays
- * @spi: the device that requires specific CS timing configuration
- * @setup: CS setup time specified via @spi_delay
- * @hold: CS hold time specified via @spi_delay
- * @inactive: CS inactive delay between transfers specified via @spi_delay
- *
- * Return: zero on success, else a negative error code.
- */
-int spi_set_cs_timing(struct spi_device *spi, struct spi_delay *setup,
-		      struct spi_delay *hold, struct spi_delay *inactive)
-{
-	struct device *parent = spi->controller->dev.parent;
-	size_t len;
-	int status;
-
-	if (spi->controller->set_cs_timing &&
-	    !(spi->cs_gpiod || gpio_is_valid(spi->cs_gpio))) {
-		mutex_lock(&spi->controller->io_mutex);
-
-		if (spi->controller->auto_runtime_pm) {
-			status = pm_runtime_get_sync(parent);
-			if (status < 0) {
-				mutex_unlock(&spi->controller->io_mutex);
-				pm_runtime_put_noidle(parent);
-				dev_err(&spi->controller->dev, "Failed to power device: %d\n",
-					status);
-				return status;
-			}
-
-			status = spi->controller->set_cs_timing(spi, setup,
-								hold, inactive);
-			pm_runtime_mark_last_busy(parent);
-			pm_runtime_put_autosuspend(parent);
-		} else {
-			status = spi->controller->set_cs_timing(spi, setup, hold,
-							      inactive);
-		}
-
-		mutex_unlock(&spi->controller->io_mutex);
-		return status;
-	}
-
-	if ((setup && setup->unit == SPI_DELAY_UNIT_SCK) ||
-	    (hold && hold->unit == SPI_DELAY_UNIT_SCK) ||
-	    (inactive && inactive->unit == SPI_DELAY_UNIT_SCK)) {
-		dev_err(&spi->dev,
-			"Clock-cycle delays for CS not supported in SW mode\n");
-		return -ENOTSUPP;
-	}
-
-	len = sizeof(struct spi_delay);
-
-	/* copy delays to controller */
-	if (setup)
-		memcpy(&spi->controller->cs_setup, setup, len);
-	else
-		memset(&spi->controller->cs_setup, 0, len);
-
-	if (hold)
-		memcpy(&spi->controller->cs_hold, hold, len);
-	else
-		memset(&spi->controller->cs_hold, 0, len);
-
-	if (inactive)
-		memcpy(&spi->controller->cs_inactive, inactive, len);
-	else
-		memset(&spi->controller->cs_inactive, 0, len);
-
-	return 0;
-}
-EXPORT_SYMBOL_GPL(spi_set_cs_timing);
-
 static int _spi_xfer_word_delay_update(struct spi_transfer *xfer,
 				       struct spi_device *spi)
 {

include/linux/spi/spi.h

@@ -1108,11 +1108,6 @@ static inline void spi_message_free(struct spi_message *m)
 	kfree(m);
 }
 
-extern int spi_set_cs_timing(struct spi_device *spi,
-			     struct spi_delay *setup,
-			     struct spi_delay *hold,
-			     struct spi_delay *inactive);
-
 extern int spi_setup(struct spi_device *spi);
 extern int spi_async(struct spi_device *spi, struct spi_message *message);
 extern int spi_async_locked(struct spi_device *spi,