diff options
Diffstat (limited to 'drivers/pwm/pwm-stm32.c')
| -rw-r--r-- | drivers/pwm/pwm-stm32.c | 22 |
1 files changed, 18 insertions, 4 deletions
diff --git a/drivers/pwm/pwm-stm32.c b/drivers/pwm/pwm-stm32.c index 6139512aab7b..2708212933f7 100644 --- a/drivers/pwm/pwm-stm32.c +++ b/drivers/pwm/pwm-stm32.c @@ -1,10 +1,9 @@ +// SPDX-License-Identifier: GPL-2.0 /* * Copyright (C) STMicroelectronics 2016 * * Author: Gerald Baeza <gerald.baeza@st.com> * - * License terms: GNU General Public License (GPL), version 2 - * * Inspired by timer-stm32.c from Maxime Coquelin * pwm-atmel.c from Bo Shen */ @@ -21,7 +20,7 @@ struct stm32_pwm { struct pwm_chip chip; - struct device *dev; + struct mutex lock; /* protect pwm config/enable */ struct clk *clk; struct regmap *regmap; u32 max_arr; @@ -214,9 +213,23 @@ static int stm32_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm, return ret; } +static int stm32_pwm_apply_locked(struct pwm_chip *chip, struct pwm_device *pwm, + struct pwm_state *state) +{ + struct stm32_pwm *priv = to_stm32_pwm_dev(chip); + int ret; + + /* protect common prescaler for all active channels */ + mutex_lock(&priv->lock); + ret = stm32_pwm_apply(chip, pwm, state); + mutex_unlock(&priv->lock); + + return ret; +} + static const struct pwm_ops stm32pwm_ops = { .owner = THIS_MODULE, - .apply = stm32_pwm_apply, + .apply = stm32_pwm_apply_locked, }; static int stm32_pwm_set_breakinput(struct stm32_pwm *priv, @@ -336,6 +349,7 @@ static int stm32_pwm_probe(struct platform_device *pdev) if (!priv) return -ENOMEM; + mutex_init(&priv->lock); priv->regmap = ddata->regmap; priv->clk = ddata->clk; priv->max_arr = ddata->max_arr; |