@@ -17,6 +17,7 @@
#include <linux/mutex.h>
#include <linux/of_address.h>
#include <linux/platform_device.h>
+#include <linux/pm.h>
#include <linux/pwm.h>
#include <linux/regmap.h>
#include <linux/slab.h>
@@ -436,7 +437,7 @@ static int fsl_pwm_probe(struct platform_device *pdev)
if (IS_ERR(base))
return PTR_ERR(base);
- fpc->regmap = devm_regmap_init_mmio_clk(&pdev->dev, NULL, base,
+ fpc->regmap = devm_regmap_init_mmio_clk(&pdev->dev, "ftm_sys", base,
&fsl_pwm_regmap_config);
if (IS_ERR(fpc->regmap)) {
dev_err(&pdev->dev, "regmap init failed\n");
@@ -487,6 +488,51 @@ static int fsl_pwm_remove(struct platform_device *pdev)
return pwmchip_remove(&fpc->chip);
}
+#ifdef CONFIG_PM_SLEEP
+static int fsl_pwm_suspend(struct device *dev)
+{
+ struct fsl_pwm_chip *fpc = dev_get_drvdata(dev);
+ u32 val;
+
+ regcache_cache_only(fpc->regmap, true);
+ regcache_mark_dirty(fpc->regmap);
+
+ /* read from cache */
+ regmap_read(fpc->regmap, FTM_OUTMASK, &val);
+ if ((val & 0xFF) != 0xFF) {
+ clk_disable_unprepare(fpc->clk[FSL_PWM_CLK_CNTEN]);
+ clk_disable_unprepare(fpc->clk[fpc->cnt_select]);
+ clk_disable_unprepare(fpc->clk[FSL_PWM_CLK_SYS]);
+ }
+
+ return 0;
+}
+
+static int fsl_pwm_resume(struct device *dev)
+{
+ struct fsl_pwm_chip *fpc = dev_get_drvdata(dev);
+ u32 val;
+
+ /* read from cache */
+ regmap_read(fpc->regmap, FTM_OUTMASK, &val);
+ if ((val & 0xFF) != 0xFF) {
+ clk_prepare_enable(fpc->clk[FSL_PWM_CLK_SYS]);
+ clk_prepare_enable(fpc->clk[fpc->cnt_select]);
+ clk_prepare_enable(fpc->clk[FSL_PWM_CLK_CNTEN]);
+ }
+
+ /* restore all registers from cache */
+ regcache_cache_only(fpc->regmap, false);
+ regcache_sync(fpc->regmap);
+
+ return 0;
+}
+#endif
+
+static const struct dev_pm_ops fsl_pwm_pm_ops = {
+ SET_SYSTEM_SLEEP_PM_OPS(fsl_pwm_suspend, fsl_pwm_resume)
+};
+
static const struct of_device_id fsl_pwm_dt_ids[] = {
{ .compatible = "fsl,vf610-ftm-pwm", },
{ /* sentinel */ }
@@ -497,6 +543,7 @@ static struct platform_driver fsl_pwm_driver = {
.driver = {
.name = "fsl-ftm-pwm",
.of_match_table = fsl_pwm_dt_ids,
+ .pm = &fsl_pwm_pm_ops,
},
.probe = fsl_pwm_probe,
.remove = fsl_pwm_remove,
Add PM support for FTM pwm driver using callback function suspend and resume in .driver.pm of platform_driver. Signed-off-by: Xiubo Li <Li.Xiubo@freescale.com> --- drivers/pwm/pwm-fsl-ftm.c | 49 ++++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 48 insertions(+), 1 deletion(-)