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Date:   Wed, 6 Mar 2019 06:30:43 +0000
From:   Clark Wang <xiaoning.wang@....com>
To:     "broonie@...nel.org" <broonie@...nel.org>
CC:     "linux-spi@...r.kernel.org" <linux-spi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH V2 5/8] spi: lpspi: use the core way to implement cs-gpio
 function

Use the default implementation of transfer_one_msg/chipselect/setup
functions in spi core to implement cs-gpio control.
Use fsl_lpspi_prepare_message to init the cs_gpio pin.

Signed-off-by: Clark Wang <xiaoning.wang@....com>
Acked-by: Fugang Duan <Fugang.duan@....com>
---
V2:
 - use core way to implement cs-gpio control. Removed the redundant code
   in the driver.
---
 drivers/spi/spi-fsl-lpspi.c | 101 +++++++++++++++++++++++-------------
 1 file changed, 66 insertions(+), 35 deletions(-)

diff --git a/drivers/spi/spi-fsl-lpspi.c b/drivers/spi/spi-fsl-lpspi.c
index 69635cde0e22..a25e0e03f058 100644
--- a/drivers/spi/spi-fsl-lpspi.c
+++ b/drivers/spi/spi-fsl-lpspi.c
@@ -9,6 +9,7 @@
 #include <linux/completion.h>
 #include <linux/delay.h>
 #include <linux/err.h>
+#include <linux/gpio.h>
 #include <linux/interrupt.h>
 #include <linux/io.h>
 #include <linux/irq.h>
@@ -16,8 +17,10 @@
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/of_device.h>
+#include <linux/of_gpio.h>
 #include <linux/pinctrl/consumer.h>
 #include <linux/platform_device.h>
+#include <linux/platform_data/spi-imx.h>
 #include <linux/pm_runtime.h>
 #include <linux/slab.h>
 #include <linux/spi/spi.h>
@@ -91,6 +94,7 @@ struct fsl_lpspi_data {
 	struct clk *clk_ipg;
 	struct clk *clk_per;
 	bool is_slave;
+	bool is_first_byte;
 
 	void *rx_buf;
 	const void *tx_buf;
@@ -106,6 +110,8 @@ struct fsl_lpspi_data {
 	struct completion xfer_done;
 
 	bool slave_aborted;
+
+	int chipselect[0];
 };
 
 static const struct of_device_id fsl_lpspi_dt_ids[] = {
@@ -178,6 +184,20 @@ static int lpspi_unprepare_xfer_hardware(struct spi_controller *controller)
 	return 0;
 }
 
+static int fsl_lpspi_prepare_message(struct spi_controller *controller,
+				     struct spi_message *msg)
+{
+	struct fsl_lpspi_data *fsl_lpspi =
+					spi_controller_get_devdata(controller);
+	struct spi_device *spi = msg->spi;
+	int gpio = fsl_lpspi->chipselect[spi->chip_select];
+
+	if (gpio_is_valid(gpio))
+		gpio_direction_output(gpio, spi->mode & SPI_CS_HIGH ? 0 : 1);
+
+	return 0;
+}
+
 static void fsl_lpspi_write_tx_fifo(struct fsl_lpspi_data *fsl_lpspi)
 {
 	u8 txfifo_cnt;
@@ -210,8 +230,7 @@ static void fsl_lpspi_read_rx_fifo(struct fsl_lpspi_data *fsl_lpspi)
 		fsl_lpspi->rx(fsl_lpspi);
 }
 
-static void fsl_lpspi_set_cmd(struct fsl_lpspi_data *fsl_lpspi,
-			      bool is_first_xfer)
+static void fsl_lpspi_set_cmd(struct fsl_lpspi_data *fsl_lpspi)
 {
 	u32 temp = 0;
 
@@ -227,7 +246,7 @@ static void fsl_lpspi_set_cmd(struct fsl_lpspi_data *fsl_lpspi,
 		 * For subsequent transfer, set TCR_CONTC to keep SS asserted.
 		 */
 		temp |= TCR_CONT;
-		if (is_first_xfer)
+		if (fsl_lpspi->is_first_byte)
 			temp &= ~TCR_CONTC;
 		else
 			temp |= TCR_CONTC;
@@ -396,8 +415,7 @@ static int fsl_lpspi_reset(struct fsl_lpspi_data *fsl_lpspi)
 	return 0;
 }
 
-static int fsl_lpspi_transfer_one(struct spi_controller *controller,
-				  struct spi_device *spi,
+static int fsl_lpspi_pio_transfer(struct spi_controller *controller,
 				  struct spi_transfer *t)
 {
 	struct fsl_lpspi_data *fsl_lpspi =
@@ -422,40 +440,27 @@ static int fsl_lpspi_transfer_one(struct spi_controller *controller,
 	return 0;
 }
 
-static int fsl_lpspi_transfer_one_msg(struct spi_controller *controller,
-				      struct spi_message *msg)
+static int fsl_lpspi_transfer_one(struct spi_controller *controller,
+				  struct spi_device *spi,
+				  struct spi_transfer *t)
 {
 	struct fsl_lpspi_data *fsl_lpspi =
-				spi_controller_get_devdata(controller);
-	struct spi_device *spi = msg->spi;
-	struct spi_transfer *xfer;
-	bool is_first_xfer = true;
-	int ret = 0;
-
-	msg->status = 0;
-	msg->actual_length = 0;
-
-	list_for_each_entry(xfer, &msg->transfers, transfer_list) {
-		ret = fsl_lpspi_setup_transfer(spi, xfer);
-		if (ret < 0)
-			goto complete;
-
-		fsl_lpspi_set_cmd(fsl_lpspi, is_first_xfer);
-
-		is_first_xfer = false;
+					spi_controller_get_devdata(controller);
+	int ret;
 
-		ret = fsl_lpspi_transfer_one(controller, spi, xfer);
-		if (ret < 0)
-			goto complete;
+	fsl_lpspi->is_first_byte = true;
+	ret = fsl_lpspi_setup_transfer(spi, t);
+	if (ret < 0)
+		return ret;
 
-		msg->actual_length += xfer->len;
-	}
+	fsl_lpspi_set_cmd(fsl_lpspi);
+	fsl_lpspi->is_first_byte = false;
 
-complete:
-	msg->status = ret;
-	spi_finalize_current_message(controller);
+	ret = fsl_lpspi_pio_transfer(controller, t);
+	if (ret < 0)
+		return ret;
 
-	return ret;
+	return 0;
 }
 
 static irqreturn_t fsl_lpspi_isr(int irq, void *dev_id)
@@ -531,10 +536,13 @@ static int fsl_lpspi_init_rpm(struct fsl_lpspi_data *fsl_lpspi)
 
 static int fsl_lpspi_probe(struct platform_device *pdev)
 {
+	struct device_node *np = pdev->dev.of_node;
 	struct fsl_lpspi_data *fsl_lpspi;
 	struct spi_controller *controller;
+	struct spi_imx_master *lpspi_platform_info =
+		dev_get_platdata(&pdev->dev);
 	struct resource *res;
-	int ret, irq;
+	int i, ret, irq;
 	u32 temp;
 
 	if (of_property_read_bool((&pdev->dev)->of_node, "spi-slave"))
@@ -558,7 +566,30 @@ static int fsl_lpspi_probe(struct platform_device *pdev)
 	fsl_lpspi->is_slave = of_property_read_bool((&pdev->dev)->of_node,
 						    "spi-slave");
 
-	controller->transfer_one_message = fsl_lpspi_transfer_one_msg;
+	if (!fsl_lpspi->is_slave) {
+		for (i = 0; i < controller->num_chipselect; i++) {
+			int cs_gpio = of_get_named_gpio(np, "cs-gpios", i);
+
+			if (!gpio_is_valid(cs_gpio) && lpspi_platform_info)
+				cs_gpio = lpspi_platform_info->chipselect[i];
+
+			fsl_lpspi->chipselect[i] = cs_gpio;
+			if (!gpio_is_valid(cs_gpio))
+				continue;
+
+			ret = devm_gpio_request(&pdev->dev,
+						fsl_lpspi->chipselect[i],
+						DRIVER_NAME);
+			if (ret) {
+				dev_err(&pdev->dev, "can't get cs gpios\n");
+				goto out_controller_put;
+			}
+		}
+		controller->cs_gpios = fsl_lpspi->chipselect;
+		controller->prepare_message = fsl_lpspi_prepare_message;
+	}
+
+	controller->transfer_one = fsl_lpspi_transfer_one;
 	controller->prepare_transfer_hardware = lpspi_prepare_xfer_hardware;
 	controller->unprepare_transfer_hardware = lpspi_unprepare_xfer_hardware;
 	controller->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH;
-- 
2.17.1

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