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pwm: lpss: remove dependency on clk framework 

Unlike other Intel LPSS devices, the PWM does not have the
clock dividers or the gate. All we get from the clock is the
rate. Since PCI case uses the driver data to get the rate,
we can drop the clk and use the same data also in case of
ACPI. The frequency is the same.

Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Chew, Chiau Ee <chiau.ee.chew@intel.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
This commit is contained in:
Heikki Krogerus 2014-05-09 11:35:21 +03:00 committed by Thierry Reding
parent ed1a819a3f
commit 65accd8738
1 changed files with 10 additions and 22 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

32
drivers/pwm/pwm-lpss.c
View File

@ -14,7 +14,6 @@
*/
#include <linux/acpi.h>
#include <linux/clk.h>
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/module.h>
@ -37,7 +36,6 @@ static int pci_drv, plat_drv; /* So we know which drivers registered */
struct pwm_lpss_chip {
struct pwm_chip chip;
void __iomem *regs;
struct clk *clk;
unsigned long clk_rate;
};
@ -97,11 +95,6 @@ static int pwm_lpss_enable(struct pwm_chip *chip, struct pwm_device *pwm)
{
struct pwm_lpss_chip *lpwm = to_lpwm(chip);
u32 ctrl;
int ret;
ret = clk_prepare_enable(lpwm->clk);
if (ret)
return ret;
ctrl = readl(lpwm->regs + PWM);
writel(ctrl | PWM_ENABLE, lpwm->regs + PWM);
@ -116,8 +109,6 @@ static void pwm_lpss_disable(struct pwm_chip *chip, struct pwm_device *pwm)
ctrl = readl(lpwm->regs + PWM);
writel(ctrl & ~PWM_ENABLE, lpwm->regs + PWM);
clk_disable_unprepare(lpwm->clk);
}
static const struct pwm_ops pwm_lpss_ops = {
@ -142,17 +133,7 @@ static struct pwm_lpss_chip *pwm_lpss_probe(struct device *dev,
if (IS_ERR(lpwm->regs))
return ERR_CAST(lpwm->regs);
if (info) {
lpwm->clk_rate = info->clk_rate;
} else {
lpwm->clk = devm_clk_get(dev, NULL);
if (IS_ERR(lpwm->clk)) {
dev_err(dev, "failed to get PWM clock\n");
return ERR_CAST(lpwm->clk);
}
lpwm->clk_rate = clk_get_rate(lpwm->clk);
}
lpwm->clk_rate = info->clk_rate;
lpwm->chip.dev = dev;
lpwm->chip.ops = &pwm_lpss_ops;
lpwm->chip.base = -1;
@ -221,12 +202,19 @@ static struct pci_driver pwm_lpss_driver_pci = {
static int pwm_lpss_probe_platform(struct platform_device *pdev)
{
const struct pwm_lpss_boardinfo *info;
const struct acpi_device_id *id;
struct pwm_lpss_chip *lpwm;
struct resource *r;
id = acpi_match_device(pdev->dev.driver->acpi_match_table, &pdev->dev);
if (!id)
return -ENODEV;
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
lpwm = pwm_lpss_probe(&pdev->dev, r, NULL);
info = (struct pwm_lpss_boardinfo *)id->driver_data;
lpwm = pwm_lpss_probe(&pdev->dev, r, info);
if (IS_ERR(lpwm))
return PTR_ERR(lpwm);
@ -242,7 +230,7 @@ static int pwm_lpss_remove_platform(struct platform_device *pdev)
}
static const struct acpi_device_id pwm_lpss_acpi_match[] = {
{ "80860F09", 0 },
{ "80860F09", (unsigned long)&byt_info },
{ },
};
MODULE_DEVICE_TABLE(acpi, pwm_lpss_acpi_match);