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path: root/drivers/pwm/pwm-tegra.c
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Diffstat (limited to 'drivers/pwm/pwm-tegra.c')
-rw-r--r--drivers/pwm/pwm-tegra.c18
1 files changed, 17 insertions, 1 deletions
diff --git a/drivers/pwm/pwm-tegra.c b/drivers/pwm/pwm-tegra.c
index 8c6ed556db28..e9b33f09ff09 100644
--- a/drivers/pwm/pwm-tegra.c
+++ b/drivers/pwm/pwm-tegra.c
@@ -41,6 +41,9 @@
struct tegra_pwm_soc {
unsigned int num_channels;
+
+ /* Maximum IP frequency for given SoCs */
+ unsigned long max_frequency;
};
struct tegra_pwm_chip {
@@ -201,7 +204,18 @@ static int tegra_pwm_probe(struct platform_device *pdev)
if (IS_ERR(pwm->clk))
return PTR_ERR(pwm->clk);
- /* Read PWM clock rate from source */
+ /* Set maximum frequency of the IP */
+ ret = clk_set_rate(pwm->clk, pwm->soc->max_frequency);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "Failed to set max frequency: %d\n", ret);
+ return ret;
+ }
+
+ /*
+ * The requested and configured frequency may differ due to
+ * clock register resolutions. Get the configured frequency
+ * so that PWM period can be calculated more accurately.
+ */
pwm->clk_rate = clk_get_rate(pwm->clk);
pwm->rst = devm_reset_control_get(&pdev->dev, "pwm");
@@ -273,10 +287,12 @@ static int tegra_pwm_resume(struct device *dev)
static const struct tegra_pwm_soc tegra20_pwm_soc = {
.num_channels = 4,
+ .max_frequency = 48000000UL,
};
static const struct tegra_pwm_soc tegra186_pwm_soc = {
.num_channels = 1,
+ .max_frequency = 102000000UL,
};
static const struct of_device_id tegra_pwm_of_match[] = {