[PATCH linux dev-4.13 v2 2/4] misc: aspeed-lpc: Request and enable LPC clock

[Joel Stanley]

The LPC device needs to ensure it's clock is enabled before it can do
anything.

Tested-by: Lei YU <mine260309 at gmail.com>
Reviewed-by: Andrew Jeffery <andrew at aj.id.au>
Signed-off-by: Joel Stanley <joel at jms.id.au>
---
 drivers/misc/aspeed-lpc-ctrl.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/drivers/misc/aspeed-lpc-ctrl.c b/drivers/misc/aspeed-lpc-ctrl.c
index b5439643f54b..4a818ad3827e 100644
--- a/drivers/misc/aspeed-lpc-ctrl.c
+++ b/drivers/misc/aspeed-lpc-ctrl.c
@@ -7,6 +7,7 @@
  * 2 of the License, or (at your option) any later version.
  */
 
+#include <linux/clk.h>
 #include <linux/mfd/syscon.h>
 #include <linux/miscdevice.h>
 #include <linux/mm.h>
@@ -26,6 +27,7 @@
 struct aspeed_lpc_ctrl {
 	struct miscdevice	miscdev;
 	struct regmap		*regmap;
+	struct clk		*clk;
 	phys_addr_t		mem_base;
 	resource_size_t		mem_size;
 	u32		pnor_size;
@@ -180,6 +182,17 @@ static int aspeed_lpc_ctrl_probe(struct platform_device *pdev)
 	if (!lpc_ctrl)
 		return -ENOMEM;
 
+	lpc_ctrl->clk = devm_clk_get(dev, NULL);
+	if (IS_ERR(lpc_ctrl->clk)) {
+		dev_err(dev, "couldn't get clock\n");
+		return PTR_ERR(lpc_ctrl->clk);
+	}
+	rc = clk_prepare_enable(lpc_ctrl->clk);
+	if (rc) {
+		dev_err(dev, "couldn't enable clock\n");
+		return rc;
+	}
+
 	node = of_parse_phandle(dev->of_node, "flash", 0);
 	if (!node) {
 		dev_err(dev, "Didn't find host pnor flash node\n");
@@ -239,6 +252,7 @@ static int aspeed_lpc_ctrl_remove(struct platform_device *pdev)
 	struct aspeed_lpc_ctrl *lpc_ctrl = dev_get_drvdata(&pdev->dev);
 
 	misc_deregister(&lpc_ctrl->miscdev);
+	clk_disable_unprepare(lpc_ctrl->clk);
 
 	return 0;
 }
-- 
2.15.1