#include <linux/clk.h>
#include <linux/io.h>
#include <linux/pwm.h>
+#include <linux/of.h>
#include <linux/of_device.h>
/* i.MX1 and i.MX21 share the same PWM function block: */
#define MX1_PWMS 0x04 /* PWM Sample Register */
#define MX1_PWMP 0x08 /* PWM Period Register */
-#define MX1_PWMC_EN (1 << 4)
+#define MX1_PWMC_EN (1 << 4)
/* i.MX27, i.MX31, i.MX35 share the same PWM function block: */
-#define MX3_PWMCR 0x00 /* PWM Control Register */
-#define MX3_PWMSAR 0x0C /* PWM Sample Register */
-#define MX3_PWMPR 0x10 /* PWM Period Register */
-#define MX3_PWMCR_PRESCALER(x) (((x - 1) & 0xFFF) << 4)
-#define MX3_PWMCR_DOZEEN (1 << 24)
-#define MX3_PWMCR_WAITEN (1 << 23)
+#define MX3_PWMCR 0x00 /* PWM Control Register */
+#define MX3_PWMSAR 0x0C /* PWM Sample Register */
+#define MX3_PWMPR 0x10 /* PWM Period Register */
+#define MX3_PWMCR_PRESCALER(x) ((((x) - 1) & 0xFFF) << 4)
+#define MX3_PWMCR_DOZEEN (1 << 24)
+#define MX3_PWMCR_WAITEN (1 << 23)
#define MX3_PWMCR_DBGEN (1 << 22)
-#define MX3_PWMCR_CLKSRC_IPG_HIGH (2 << 16)
-#define MX3_PWMCR_CLKSRC_IPG (1 << 16)
-#define MX3_PWMCR_EN (1 << 0)
+#define MX3_PWMCR_POUTC (1 << 18)
+#define MX3_PWMCR_CLKSRC_IPG_HIGH (2 << 16)
+#define MX3_PWMCR_CLKSRC_IPG (1 << 16)
+#define MX3_PWMCR_EN (1 << 0)
struct imx_chip {
struct clk *clk_per;
if (test_bit(PWMF_ENABLED, &pwm->flags))
cr |= MX3_PWMCR_EN;
+ if (pwm->polarity == PWM_POLARITY_INVERSED)
+ cr |= MX3_PWMCR_POUTC;
writel(cr, imx->mmio_base + MX3_PWMCR);
else
val &= ~MX3_PWMCR_EN;
+ if (chip->pwms[0].polarity == PWM_POLARITY_INVERSED)
+ val |= MX3_PWMCR_POUTC;
+ else
+ val &= ~MX3_PWMCR_POUTC;
+
writel(val, imx->mmio_base + MX3_PWMCR);
}
clk_disable_unprepare(imx->clk_per);
}
+static int imx_pwm_set_polarity(struct pwm_chip *chip, struct pwm_device *pwm,
+ enum pwm_polarity polarity)
+{
+ struct imx_chip *imx = to_imx_chip(chip);
+
+ dev_info(imx->chip.dev, "%s: polarity set to %s\n", __func__,
+ polarity == PWM_POLARITY_INVERSED ? "inverted" : "normal");
+
+ return 0;
+}
+
static struct pwm_ops imx_pwm_ops = {
.enable = imx_pwm_enable,
.disable = imx_pwm_disable,
int (*config)(struct pwm_chip *chip,
struct pwm_device *pwm, int duty_ns, int period_ns);
void (*set_enable)(struct pwm_chip *chip, bool enable);
+ unsigned output_polarity:1;
};
static struct imx_pwm_data imx_pwm_data_v1 = {
static struct imx_pwm_data imx_pwm_data_v2 = {
.config = imx_pwm_config_v2,
.set_enable = imx_pwm_set_enable_v2,
+ .output_polarity = 1,
};
static const struct of_device_id imx_pwm_dt_ids[] = {
return PTR_ERR(imx->mmio_base);
data = of_id->data;
+ if (data->output_polarity) {
+ dev_info(&pdev->dev, "PWM supports output inversion\n");
+ imx_pwm_ops.set_polarity = imx_pwm_set_polarity;
+ imx->chip.of_xlate = of_pwm_xlate_with_flags;
+ imx->chip.of_pwm_n_cells = 3;
+ }
+
imx->config = data->config;
imx->set_enable = data->set_enable;
.driver = {
.name = "imx-pwm",
.owner = THIS_MODULE,
- .of_match_table = of_match_ptr(imx_pwm_dt_ids),
+ .of_match_table = imx_pwm_dt_ids,
},
.probe = imx_pwm_probe,
.remove = imx_pwm_remove,