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misc: aspeed-lpc: Request and enable LPC clock

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

In the past the clock was enabled and left running by u-boot, however
Linux now has an upstream clock driver that disables unused clocks.

Tested-by: Lei YU <mine260309@gmail.com>
Reviewed-by: Andrew Jeffery <andrew@aj.id.au>
Signed-off-by: Joel Stanley <joel@jms.id.au>
Reviewed-by: Cyril Bur <cyrilbur@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Joel Stanley 2018-02-19 17:54:21 +10:30 committed by Greg Kroah-Hartman
parent eb105eace9
commit 99aad9e3a9
1 changed files with 23 additions and 3 deletions
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26
drivers/misc/aspeed-lpc-ctrl.c
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@ -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;
@ -221,16 +223,33 @@ static int aspeed_lpc_ctrl_probe(struct platform_device *pdev)
return -ENODEV;
}
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;
}
lpc_ctrl->miscdev.minor = MISC_DYNAMIC_MINOR;
lpc_ctrl->miscdev.name = DEVICE_NAME;
lpc_ctrl->miscdev.fops = &aspeed_lpc_ctrl_fops;
lpc_ctrl->miscdev.parent = dev;
rc = misc_register(&lpc_ctrl->miscdev);
if (rc)
if (rc) {
dev_err(dev, "Unable to register device\n");
else
dev_info(dev, "Loaded at %pr\n", &resm);
goto err;
}
dev_info(dev, "Loaded at %pr\n", &resm);
return 0;
err:
clk_disable_unprepare(lpc_ctrl->clk);
return rc;
}
@ -239,6 +258,7 @@ 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;
}