X-Git-Url: http://git.samba.org/samba.git/?a=blobdiff_plain;f=drivers%2Fspi%2Fspi-s3c64xx.c;h=1c36311935d7cb271ce0287166f224dc84c046e9;hb=d1345c524e12c0cd1a81d5899d647f93e9fcb760;hp=75a56968b14cfabf37f772dce9343583bde9806b;hpb=7c574cf6aeb75920ba4d3af937bb1b3c42785ac4;p=sfrench%2Fcifs-2.6.git

diff --git a/drivers/spi/spi-s3c64xx.c b/drivers/spi/spi-s3c64xx.c
index 75a56968b14c..1c36311935d7 100644
--- a/drivers/spi/spi-s3c64xx.c
+++ b/drivers/spi/spi-s3c64xx.c
@@ -197,7 +197,6 @@ struct s3c64xx_spi_driver_data {
 	struct s3c64xx_spi_dma_data	tx_dma;
 	struct s3c64xx_spi_port_config	*port_conf;
 	unsigned int			port_id;
-	bool				cs_gpio;
 };
 
 static void flush_fifo(struct s3c64xx_spi_driver_data *sdd)
@@ -754,10 +753,8 @@ static struct s3c64xx_spi_csinfo *s3c64xx_get_slave_ctrldata(
 {
 	struct s3c64xx_spi_csinfo *cs;
 	struct device_node *slave_np, *data_np = NULL;
-	struct s3c64xx_spi_driver_data *sdd;
 	u32 fb_delay = 0;
 
-	sdd = spi_master_get_devdata(spi->master);
 	slave_np = spi->dev.of_node;
 	if (!slave_np) {
 		dev_err(&spi->dev, "device node not found\n");
@@ -776,17 +773,6 @@ static struct s3c64xx_spi_csinfo *s3c64xx_get_slave_ctrldata(
 		return ERR_PTR(-ENOMEM);
 	}
 
-	/* The CS line is asserted/deasserted by the gpio pin */
-	if (sdd->cs_gpio)
-		cs->line = of_get_named_gpio(data_np, "cs-gpio", 0);
-
-	if (!gpio_is_valid(cs->line)) {
-		dev_err(&spi->dev, "chip select gpio is not specified or invalid\n");
-		kfree(cs);
-		of_node_put(data_np);
-		return ERR_PTR(-EINVAL);
-	}
-
 	of_property_read_u32(data_np, "samsung,spi-feedback-delay", &fb_delay);
 	cs->fb_delay = fb_delay;
 	of_node_put(data_np);
@@ -807,9 +793,16 @@ static int s3c64xx_spi_setup(struct spi_device *spi)
 	int err;
 
 	sdd = spi_master_get_devdata(spi->master);
-	if (!cs && spi->dev.of_node) {
+	if (spi->dev.of_node) {
 		cs = s3c64xx_get_slave_ctrldata(spi);
 		spi->controller_data = cs;
+	} else if (cs) {
+		/* On non-DT platforms the SPI core will set spi->cs_gpio
+		 * to -ENOENT. The GPIO pin used to drive the chip select
+		 * is defined by using platform data so spi->cs_gpio value
+		 * has to be override to have the proper GPIO pin number.
+		 */
+		spi->cs_gpio = cs->line;
 	}
 
 	if (IS_ERR_OR_NULL(cs)) {
@@ -818,18 +811,15 @@ static int s3c64xx_spi_setup(struct spi_device *spi)
 	}
 
 	if (!spi_get_ctldata(spi)) {
-		/* Request gpio only if cs line is asserted by gpio pins */
-		if (sdd->cs_gpio) {
-			err = gpio_request_one(cs->line, GPIOF_OUT_INIT_HIGH,
-					dev_name(&spi->dev));
+		if (gpio_is_valid(spi->cs_gpio)) {
+			err = gpio_request_one(spi->cs_gpio, GPIOF_OUT_INIT_HIGH,
+					       dev_name(&spi->dev));
 			if (err) {
 				dev_err(&spi->dev,
 					"Failed to get /CS gpio [%d]: %d\n",
-					cs->line, err);
+					spi->cs_gpio, err);
 				goto err_gpio_req;
 			}
-
-			spi->cs_gpio = cs->line;
 		}
 
 		spi_set_ctldata(spi, cs);
@@ -884,7 +874,8 @@ setup_exit:
 	/* setup() returns with device de-selected */
 	writel(S3C64XX_SPI_SLAVE_SIG_INACT, sdd->regs + S3C64XX_SPI_SLAVE_SEL);
 
-	gpio_free(cs->line);
+	if (gpio_is_valid(spi->cs_gpio))
+		gpio_free(spi->cs_gpio);
 	spi_set_ctldata(spi, NULL);
 
 err_gpio_req:
@@ -897,14 +888,21 @@ err_gpio_req:
 static void s3c64xx_spi_cleanup(struct spi_device *spi)
 {
 	struct s3c64xx_spi_csinfo *cs = spi_get_ctldata(spi);
-	struct s3c64xx_spi_driver_data *sdd;
 
-	sdd = spi_master_get_devdata(spi->master);
-	if (spi->cs_gpio) {
+	if (gpio_is_valid(spi->cs_gpio)) {
 		gpio_free(spi->cs_gpio);
 		if (spi->dev.of_node)
 			kfree(cs);
+		else {
+			/* On non-DT platforms, the SPI core sets
+			 * spi->cs_gpio to -ENOENT and .setup()
+			 * overrides it with the GPIO pin value
+			 * passed using platform data.
+			 */
+			spi->cs_gpio = -ENOENT;
+		}
 	}
+
 	spi_set_ctldata(spi, NULL);
 }
 
@@ -1075,11 +1073,7 @@ static int s3c64xx_spi_probe(struct platform_device *pdev)
 	sdd->cntrlr_info = sci;
 	sdd->pdev = pdev;
 	sdd->sfr_start = mem_res->start;
-	sdd->cs_gpio = true;
 	if (pdev->dev.of_node) {
-		if (!of_find_property(pdev->dev.of_node, "cs-gpio", NULL))
-			sdd->cs_gpio = false;
-
 		ret = of_alias_get_id(pdev->dev.of_node, "spi");
 		if (ret < 0) {
 			dev_err(&pdev->dev, "failed to get alias id, errno %d\n",