1 files changed, 20 insertions, 8 deletions

diff --git a/drivers/input/serio/olpc_apsp.c b/drivers/input/serio/olpc_apsp.c
index 8e9a4209fcad..b36084710f69 100644
--- a/drivers/input/serio/olpc_apsp.c
+++ b/drivers/input/serio/olpc_apsp.c
@@ -23,6 +23,7 @@
 #include <linux/of.h>
 #include <linux/slab.h>
 #include <linux/delay.h>
+#include <linux/clk.h>
 
 /*
  * The OLPC XO-1.75 and XO-4 laptops do not have a hardware PS/2 controller.
@@ -74,6 +75,7 @@ struct olpc_apsp {
 	struct serio *kbio;
 	struct serio *padio;
 	void __iomem *base;
+	struct clk *clk;
 	int open_count;
 	int irq;
 };
@@ -145,8 +147,21 @@ static int olpc_apsp_open(struct serio *port)
 {
 	struct olpc_apsp *priv = port->port_data;
 	unsigned int tmp;
+	unsigned long l;
+	int error;
 
 	if (priv->open_count++ == 0) {
+		error = clk_prepare_enable(priv->clk);
+		if (error)
+			return error;
+
+		l = readl(priv->base + COMMAND_FIFO_STATUS);
+		if (!(l & CMD_STS_MASK)) {
+			dev_err(priv->dev, "SP cannot accept commands.\n");
+			clk_disable_unprepare(priv->clk);
+			return -EIO;
+		}
+
 		/* Enable interrupt 0 by clearing its bit */
 		tmp = readl(priv->base + PJ_INTERRUPT_MASK);
 		writel(tmp & ~INT_0, priv->base + PJ_INTERRUPT_MASK);
@@ -164,6 +179,8 @@ static void olpc_apsp_close(struct serio *port)
 		/* Disable interrupt 0 */
 		tmp = readl(priv->base + PJ_INTERRUPT_MASK);
 		writel(tmp | INT_0, priv->base + PJ_INTERRUPT_MASK);
+
+		clk_disable_unprepare(priv->clk);
 	}
 }
 
@@ -172,15 +189,12 @@ static int olpc_apsp_probe(struct platform_device *pdev)
 	struct serio *kb_serio, *pad_serio;
 	struct olpc_apsp *priv;
 	struct resource *res;
-	struct device_node *np;
-	unsigned long l;
 	int error;
 
 	priv = devm_kzalloc(&pdev->dev, sizeof(struct olpc_apsp), GFP_KERNEL);
 	if (!priv)
 		return -ENOMEM;
 
-	np = pdev->dev.of_node;
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	priv->base = devm_ioremap_resource(&pdev->dev, res);
 	if (IS_ERR(priv->base)) {
@@ -192,11 +206,9 @@ static int olpc_apsp_probe(struct platform_device *pdev)
 	if (priv->irq < 0)
 		return priv->irq;
 
-	l = readl(priv->base + COMMAND_FIFO_STATUS);
-	if (!(l & CMD_STS_MASK)) {
-		dev_err(&pdev->dev, "SP cannot accept commands.\n");
-		return -EIO;
-	}
+	priv->clk = devm_clk_get(&pdev->dev, "sp");
+	if (IS_ERR(priv->clk))
+		return PTR_ERR(priv->clk);
 
 	/* KEYBOARD */
 	kb_serio = kzalloc(sizeof(struct serio), GFP_KERNEL);