Applied "spi: cadence: Convert to use CS GPIO descriptors" to the spi tree

[Mark Brown <broonie@xxxxxxxxxx>]

The patch

   spi: cadence: Convert to use CS GPIO descriptors

has been applied to the spi tree at

   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git 

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.  

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

>From cfeefa79dc37d378216e2ced1600e297dd04e591 Mon Sep 17 00:00:00 2001
From: Linus Walleij <linus.walleij@xxxxxxxxxx>
Date: Mon, 7 Jan 2019 16:51:53 +0100
Subject: [PATCH] spi: cadence: Convert to use CS GPIO descriptors

This converts the Cadence SPI master driver to use GPIO
descriptors for chip select handling.

The Cadence driver was allocating a state container just
to hold the requested GPIO line and contained lots of
polarity inversion code. As this is all handled by gpiolib
and a simple devm_* request in the core, and as the driver
is fully device tree only, most of this code chunk goes
away in favour of central handling. The setup/cleanup
callbacks goes away.

This driver does NOT drive the CS line by setting the
value of the GPIO so it relies on the SPI core to do
this, which should work just fine with the descriptors.

Cc: Wei Yongjun <weiyongjun1@xxxxxxxxxx>
Cc: Janek Kotas <jank@xxxxxxxxxxx>
Cc: Linuxarm <linuxarm@xxxxxxxxxx>
Signed-off-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
---
 drivers/spi/spi-cadence.c | 67 ++-------------------------------------
 1 file changed, 2 insertions(+), 65 deletions(-)

diff --git a/drivers/spi/spi-cadence.c b/drivers/spi/spi-cadence.c
index 7c88f74f7f47..e332d173dbf9 100644
--- a/drivers/spi/spi-cadence.c
+++ b/drivers/spi/spi-cadence.c
@@ -13,7 +13,7 @@
 
 #include <linux/clk.h>
 #include <linux/delay.h>
-#include <linux/gpio.h>
+#include <linux/gpio/consumer.h>
 #include <linux/interrupt.h>
 #include <linux/io.h>
 #include <linux/module.h>
@@ -128,10 +128,6 @@ struct cdns_spi {
 	u32 is_decoded_cs;
 };
 
-struct cdns_spi_device_data {
-	bool gpio_requested;
-};
-
 /* Macros for the SPI controller read/write */
 static inline u32 cdns_spi_read(struct cdns_spi *xspi, u32 offset)
 {
@@ -469,64 +465,6 @@ static int cdns_unprepare_transfer_hardware(struct spi_master *master)
 	return 0;
 }
 
-static int cdns_spi_setup(struct spi_device *spi)
-{
-
-	int ret = -EINVAL;
-	struct cdns_spi_device_data *cdns_spi_data = spi_get_ctldata(spi);
-
-	/* this is a pin managed by the controller, leave it alone */
-	if (spi->cs_gpio == -ENOENT)
-		return 0;
-
-	/* this seems to be the first time we're here */
-	if (!cdns_spi_data) {
-		cdns_spi_data = kzalloc(sizeof(*cdns_spi_data), GFP_KERNEL);
-		if (!cdns_spi_data)
-			return -ENOMEM;
-		cdns_spi_data->gpio_requested = false;
-		spi_set_ctldata(spi, cdns_spi_data);
-	}
-
-	/* if we haven't done so, grab the gpio */
-	if (!cdns_spi_data->gpio_requested && gpio_is_valid(spi->cs_gpio)) {
-		ret = gpio_request_one(spi->cs_gpio,
-				       (spi->mode & SPI_CS_HIGH) ?
-				       GPIOF_OUT_INIT_LOW : GPIOF_OUT_INIT_HIGH,
-				       dev_name(&spi->dev));
-		if (ret)
-			dev_err(&spi->dev, "can't request chipselect gpio %d\n",
-				spi->cs_gpio);
-		else
-			cdns_spi_data->gpio_requested = true;
-	} else {
-		if (gpio_is_valid(spi->cs_gpio)) {
-			int mode = ((spi->mode & SPI_CS_HIGH) ?
-				    GPIOF_OUT_INIT_LOW : GPIOF_OUT_INIT_HIGH);
-
-			ret = gpio_direction_output(spi->cs_gpio, mode);
-			if (ret)
-				dev_err(&spi->dev, "chipselect gpio %d setup failed (%d)\n",
-					spi->cs_gpio, ret);
-		}
-	}
-
-	return ret;
-}
-
-static void cdns_spi_cleanup(struct spi_device *spi)
-{
-	struct cdns_spi_device_data *cdns_spi_data = spi_get_ctldata(spi);
-
-	if (cdns_spi_data) {
-		if (cdns_spi_data->gpio_requested)
-			gpio_free(spi->cs_gpio);
-		kfree(cdns_spi_data);
-		spi_set_ctldata(spi, NULL);
-	}
-
-}
-
 /**
  * cdns_spi_probe - Probe method for the SPI driver
  * @pdev:	Pointer to the platform_device structure
@@ -621,13 +559,12 @@ static int cdns_spi_probe(struct platform_device *pdev)
 		goto clk_dis_all;
 	}
 
+	master->use_gpio_descriptors = true;
 	master->prepare_transfer_hardware = cdns_prepare_transfer_hardware;
 	master->prepare_message = cdns_prepare_message;
 	master->transfer_one = cdns_transfer_one;
 	master->unprepare_transfer_hardware = cdns_unprepare_transfer_hardware;
 	master->set_cs = cdns_spi_chipselect;
-	master->setup = cdns_spi_setup;
-	master->cleanup = cdns_spi_cleanup;
 	master->auto_runtime_pm = true;
 	master->mode_bits = SPI_CPOL | SPI_CPHA;
 
-- 
2.20.1