ARM: clps711x: Switch to devicetree usage

This is a complex patch that switches the ARM CLPS711X architecture
to work with the device tree. Includes changes to board initialization
and any architecture drivers used.

Signed-off-by: Alexander Shiyan <eagle.alexander923@gmail.com>
Link: https://lore.barebox.org/20220524060411.7754-1-eagle.alexander923@gmail.com
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

1 files changed, 28 insertions, 29 deletions

diff --git a/drivers/serial/serial_clps711x.c b/drivers/serial/serial_clps711x.c
index 7aac0970bf..81eb85429e 100644
--- a/drivers/serial/serial_clps711x.c
+++ b/drivers/serial/serial_clps711x.c
@@ -35,7 +35,7 @@
 
 struct clps711x_uart {
 	void __iomem		*base;
-	void __iomem		*syscon;
+	struct regmap		*regmap;
 	struct clk		*uart_clk;
 	struct console_device	cdev;
 };
@@ -61,8 +61,7 @@ static void clps711x_init_port(struct console_device *cdev)
 	u32 tmp;
 
 	/* Disable the UART */
-	tmp = readl(s->syscon + SYSCON);
-	writel(tmp & ~SYSCON_UARTEN, s->syscon + SYSCON);
+	regmap_update_bits(s->regmap, SYSCON, SYSCON_UARTEN, 0);
 
 	/* Setup Line Control Register */
 	tmp = readl(s->base + UBRLCR) & UBRLCR_BAUD_MASK;
@@ -70,17 +69,19 @@ static void clps711x_init_port(struct console_device *cdev)
 	writel(tmp, s->base + UBRLCR);
 
 	/* Enable the UART */
-	tmp = readl(s->syscon + SYSCON);
-	writel(tmp | SYSCON_UARTEN, s->syscon + SYSCON);
+	regmap_update_bits(s->regmap, SYSCON, SYSCON_UARTEN, SYSCON_UARTEN);
 }
 
 static void clps711x_putc(struct console_device *cdev, char c)
 {
 	struct clps711x_uart *s = cdev->dev->priv;
+	u32 tmp;
 
 	/* Wait until there is space in the FIFO */
 	do {
-	} while (readl(s->syscon + SYSFLG) & SYSFLG_UTXFF);
+		regmap_read(s->regmap, SYSFLG, &tmp);
+
+	} while (tmp & SYSFLG_UTXFF);
 
 	/* Send the character */
 	writew(c, s->base + UARTDR);
@@ -90,10 +91,12 @@ static int clps711x_getc(struct console_device *cdev)
 {
 	struct clps711x_uart *s = cdev->dev->priv;
 	u16 data;
+	u32 tmp;
 
 	/* Wait until there is data in the FIFO */
 	do {
-	} while (readl(s->syscon + SYSFLG) & SYSFLG_URXFE);
+		regmap_read(s->regmap, SYSFLG, &tmp);
+	} while (tmp & SYSFLG_URXFE);
 
 	data = readw(s->base + UARTDR);
 
@@ -107,32 +110,32 @@ static int clps711x_getc(struct console_device *cdev)
 static int clps711x_tstc(struct console_device *cdev)
 {
 	struct clps711x_uart *s = cdev->dev->priv;
+	u32 tmp;
+
+	regmap_read(s->regmap, SYSFLG, &tmp);
 
-	return !(readl(s->syscon + SYSFLG) & SYSFLG_URXFE);
+	return !(tmp & SYSFLG_URXFE);
 }
 
 static void clps711x_flush(struct console_device *cdev)
 {
 	struct clps711x_uart *s = cdev->dev->priv;
+	u32 tmp;
 
 	do {
-	} while (readl(s->syscon + SYSFLG) & SYSFLG_UBUSY);
+		regmap_read(s->regmap, SYSFLG, &tmp);
+	} while (tmp & SYSFLG_UBUSY);
 }
 
 static int clps711x_probe(struct device_d *dev)
 {
+	struct device_node *syscon;
 	struct clps711x_uart *s;
-	int err, id = dev->id;
-	char syscon_dev[8];
 	const char *devname;
-
-	if (dev->device_node)
-		id = of_alias_get_id(dev->device_node, "serial");
-
-	if (id != 0 && id != 1)
-		return -EINVAL;
+	int err;
 
 	s = xzalloc(sizeof(struct clps711x_uart));
+
 	s->uart_clk = clk_get(dev, NULL);
 	if (IS_ERR(s->uart_clk)) {
 		err = PTR_ERR(s->uart_clk);
@@ -140,19 +143,15 @@ static int clps711x_probe(struct device_d *dev)
 	}
 
 	s->base = dev_get_mem_region(dev, 0);
-	if (IS_ERR(s->base))
-		return PTR_ERR(s->base);
-
-	if (!dev->device_node) {
-		sprintf(syscon_dev, "syscon%i", id + 1);
-		s->syscon = syscon_base_lookup_by_pdevname(syscon_dev);
-	} else {
-		s->syscon = syscon_base_lookup_by_phandle(dev->device_node,
-							  "syscon");
+	if (IS_ERR(s->base)) {
+		err = PTR_ERR(s->base);
+		goto out_err;
 	}
 
-	if (IS_ERR(s->syscon)) {
-		err = PTR_ERR(s->syscon);
+	syscon = of_parse_phandle(dev->device_node, "syscon", 0);
+	s->regmap = syscon_node_to_regmap(syscon);
+	if (IS_ERR(s->regmap)) {
+		err = PTR_ERR(s->regmap);
 		goto out_err;
 	}
 
@@ -182,7 +181,7 @@ out_err:
 	return err;
 }
 
-static struct of_device_id __maybe_unused clps711x_uart_dt_ids[] = {
+static const struct of_device_id __maybe_unused clps711x_uart_dt_ids[] = {
 	{ .compatible = "cirrus,ep7209-uart", },
 	{ /* sentinel */ }
 };