tty: serial: modify PL011 driver to use pinctrl PM helpers

This augments the PL011 UART driver to utilize the new pinctrl
core PM helpers to transition the driver to default and sleep
states, cutting away some boilerplate code.

Cc: Hebbar Gururaja <gururaja.hebbar@ti.com>
Cc: Mark Brown <broonie@kernel.org>
Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Cc: Kevin Hilman <khilman@linaro.org>
Cc: Stephen Warren <swarren@wwwdotorg.org>
Acked-by: Wolfram Sang <wsa@the-dreams.de>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/tty/serial/amba-pl011.c

@@ -151,10 +151,6 @@ struct pl011_dmatx_data {
 struct uart_amba_port {
 	struct uart_port	port;
 	struct clk		*clk;
-	/* Two optional pin states - default & sleep */
-	struct pinctrl		*pinctrl;
-	struct pinctrl_state	*pins_default;
-	struct pinctrl_state	*pins_sleep;
 	const struct vendor_data *vendor;
 	unsigned int		dmacr;		/* dma control reg */
 	unsigned int		im;		/* interrupt mask */
@@ -1480,12 +1476,7 @@ static int pl011_hwinit(struct uart_port *port)
 	int retval;
 
 	/* Optionaly enable pins to be muxed in and configured */
-	if (!IS_ERR(uap->pins_default)) {
-		retval = pinctrl_select_state(uap->pinctrl, uap->pins_default);
-		if (retval)
-			dev_err(port->dev,
-				"could not set default pins\n");
-	}
+	pinctrl_pm_select_default_state(port->dev);
 
 	/*
 	 * Try to enable the clock producer.
@@ -1611,7 +1602,6 @@ static void pl011_shutdown(struct uart_port *port)
 {
 	struct uart_amba_port *uap = (struct uart_amba_port *)port;
 	unsigned int cr;
-	int retval;
 
 	/*
 	 * disable all interrupts
@@ -1654,13 +1644,7 @@ static void pl011_shutdown(struct uart_port *port)
 	 */
 	clk_disable_unprepare(uap->clk);
 	/* Optionally let pins go into sleep states */
-	if (!IS_ERR(uap->pins_sleep)) {
-		retval = pinctrl_select_state(uap->pinctrl, uap->pins_sleep);
-		if (retval)
-			dev_err(port->dev,
-				"could not set pins to sleep state\n");
-	}
-
+	pinctrl_pm_select_sleep_state(port->dev);
 
 	if (uap->port.dev->platform_data) {
 		struct amba_pl011_data *plat;
@@ -2013,12 +1997,7 @@ static int __init pl011_console_setup(struct console *co, char *options)
 		return -ENODEV;
 
 	/* Allow pins to be muxed in and configured */
-	if (!IS_ERR(uap->pins_default)) {
-		ret = pinctrl_select_state(uap->pinctrl, uap->pins_default);
-		if (ret)
-			dev_err(uap->port.dev,
-				"could not set default pins\n");
-	}
+	pinctrl_pm_select_default_state(uap->port.dev);
 
 	ret = clk_prepare(uap->clk);
 	if (ret)
@@ -2132,21 +2111,6 @@ static int pl011_probe(struct amba_device *dev, const struct amba_id *id)
 		goto out;
 	}
 
-	uap->pinctrl = devm_pinctrl_get(&dev->dev);
-	if (IS_ERR(uap->pinctrl)) {
-		ret = PTR_ERR(uap->pinctrl);
-		goto out;
-	}
-	uap->pins_default = pinctrl_lookup_state(uap->pinctrl,
-						 PINCTRL_STATE_DEFAULT);
-	if (IS_ERR(uap->pins_default))
-		dev_err(&dev->dev, "could not get default pinstate\n");
-
-	uap->pins_sleep = pinctrl_lookup_state(uap->pinctrl,
-					       PINCTRL_STATE_SLEEP);
-	if (IS_ERR(uap->pins_sleep))
-		dev_dbg(&dev->dev, "could not get sleep pinstate\n");
-
 	uap->clk = devm_clk_get(&dev->dev, NULL);
 	if (IS_ERR(uap->clk)) {
 		ret = PTR_ERR(uap->clk);