pwm: ftm: Add regmap rbtree type cache support
This patch is to prepare for adding 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>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
diff --git a/drivers/pwm/pwm-fsl-ftm.c b/drivers/pwm/pwm-fsl-ftm.c
index 1150598..9bfbea5 100644
--- a/drivers/pwm/pwm-fsl-ftm.c
+++ b/drivers/pwm/pwm-fsl-ftm.c
@@ -397,12 +397,23 @@
return 0;
}
+static bool fsl_pwm_volatile_reg(struct device *dev, unsigned int reg)
+{
+ switch (reg) {
+ case FTM_CNT:
+ return true;
+ }
+ return false;
+}
+
static const struct regmap_config fsl_pwm_regmap_config = {
.reg_bits = 32,
.reg_stride = 4,
.val_bits = 32,
.max_register = FTM_PWMLOAD,
+ .volatile_reg = fsl_pwm_volatile_reg,
+ .cache_type = REGCACHE_RBTREE,
};
static int fsl_pwm_probe(struct platform_device *pdev)