1 files changed, 58 insertions, 0 deletions
diff --git a/drivers/pwm/core.c b/drivers/pwm/core.c
index 830a697826af..d70f793ce4b3 100644
--- a/drivers/pwm/core.c
+++ b/drivers/pwm/core.c
@@ -454,6 +454,64 @@ of_pwm_single_xlate(struct pwm_chip *chip, const struct of_phandle_args *args)
 }
 EXPORT_SYMBOL_GPL(of_pwm_single_xlate);
 
+#define PWMCHIP_ALIGN ARCH_DMA_MINALIGN
+
+static void *pwmchip_priv(struct pwm_chip *chip)
+{
+	return (void *)chip + ALIGN(sizeof(*chip), PWMCHIP_ALIGN);
+}
+
+/* This is the counterpart to pwmchip_alloc() */
+void pwmchip_put(struct pwm_chip *chip)
+{
+	kfree(chip);
+}
+EXPORT_SYMBOL_GPL(pwmchip_put);
+
+struct pwm_chip *pwmchip_alloc(struct device *parent, unsigned int npwm, size_t sizeof_priv)
+{
+	struct pwm_chip *chip;
+	size_t alloc_size;
+
+	alloc_size = size_add(ALIGN(sizeof(*chip), PWMCHIP_ALIGN), sizeof_priv);
+
+	chip = kzalloc(alloc_size, GFP_KERNEL);
+	if (!chip)
+		return ERR_PTR(-ENOMEM);
+
+	chip->dev = parent;
+	chip->npwm = npwm;
+
+	pwmchip_set_drvdata(chip, pwmchip_priv(chip));
+
+	return chip;
+}
+EXPORT_SYMBOL_GPL(pwmchip_alloc);
+
+static void devm_pwmchip_put(void *data)
+{
+	struct pwm_chip *chip = data;
+
+	pwmchip_put(chip);
+}
+
+struct pwm_chip *devm_pwmchip_alloc(struct device *parent, unsigned int npwm, size_t sizeof_priv)
+{
+	struct pwm_chip *chip;
+	int ret;
+
+	chip = pwmchip_alloc(parent, npwm, sizeof_priv);
+	if (IS_ERR(chip))
+		return chip;
+
+	ret = devm_add_action_or_reset(parent, devm_pwmchip_put, chip);
+	if (ret)
+		return ERR_PTR(ret);
+
+	return chip;
+}
+EXPORT_SYMBOL_GPL(devm_pwmchip_alloc);
+
 static void of_pwmchip_add(struct pwm_chip *chip)
 {
 	if (!pwmchip_parent(chip) || !pwmchip_parent(chip)->of_node)