diff options
Diffstat (limited to 'drivers/pwm')
| -rw-r--r-- | drivers/pwm/pwm-imx.c | 53 |
1 files changed, 48 insertions, 5 deletions
diff --git a/drivers/pwm/pwm-imx.c b/drivers/pwm/pwm-imx.c index 6cd3b72fbbc1..55a3a363d5be 100644 --- a/drivers/pwm/pwm-imx.c +++ b/drivers/pwm/pwm-imx.c @@ -87,6 +87,8 @@ #define MX3_PWMPR_MAX 0xfffe struct imx_chip { + struct clk *clk_ipg; + struct clk *clk_per; void __iomem *mmio_base; @@ -96,6 +98,32 @@ struct imx_chip { #define to_imx_chip(chip) container_of(chip, struct imx_chip, chip) +static int imx_pwm_clk_prepare_enable(struct pwm_chip *chip) +{ + struct imx_chip *imx = to_imx_chip(chip); + int ret; + + ret = clk_prepare_enable(imx->clk_ipg); + if (ret) + return ret; + + ret = clk_prepare_enable(imx->clk_per); + if (ret) { + clk_disable_unprepare(imx->clk_ipg); + return ret; + } + + return 0; +} + +static void imx_pwm_clk_disable_unprepare(struct pwm_chip *chip) +{ + struct imx_chip *imx = to_imx_chip(chip); + + clk_disable_unprepare(imx->clk_per); + clk_disable_unprepare(imx->clk_ipg); +} + static void imx_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm, struct pwm_state *state) { @@ -103,11 +131,15 @@ static void imx_pwm_get_state(struct pwm_chip *chip, u32 period, prescaler, pwm_clk, ret, val; u64 tmp; + ret = imx_pwm_clk_prepare_enable(chip); + if (ret < 0) + return; + val = readl(imx->mmio_base + MX3_PWMCR); if (val & MX3_PWMCR_EN) { state->enabled = true; - ret = clk_prepare_enable(imx->clk_per); + ret = imx_pwm_clk_prepare_enable(chip); if (ret) return; } else { @@ -143,6 +175,8 @@ static void imx_pwm_get_state(struct pwm_chip *chip, } else { state->duty_cycle = 0; } + + imx_pwm_clk_disable_unprepare(chip); } static int imx_pwm_config_v1(struct pwm_chip *chip, @@ -180,7 +214,7 @@ static int imx_pwm_enable_v1(struct pwm_chip *chip, struct pwm_device *pwm) u32 val; int ret; - ret = clk_prepare_enable(imx->clk_per); + ret = imx_pwm_clk_prepare_enable(chip); if (ret < 0) return ret; @@ -200,7 +234,7 @@ static void imx_pwm_disable_v1(struct pwm_chip *chip, struct pwm_device *pwm) val &= ~MX1_PWMC_EN; writel(val, imx->mmio_base + MX1_PWMC); - clk_disable_unprepare(imx->clk_per); + imx_pwm_clk_disable_unprepare(chip); } static void imx_pwm_sw_reset(struct pwm_chip *chip) @@ -286,7 +320,7 @@ static int imx_pwm_apply_v2(struct pwm_chip *chip, struct pwm_device *pwm, if (cstate.enabled) { imx_pwm_wait_fifo_slot(chip, pwm); } else { - ret = clk_prepare_enable(imx->clk_per); + ret = imx_pwm_clk_prepare_enable(chip); if (ret) return ret; @@ -309,7 +343,7 @@ static int imx_pwm_apply_v2(struct pwm_chip *chip, struct pwm_device *pwm, } else if (cstate.enabled) { writel(0, imx->mmio_base + MX3_PWMCR); - clk_disable_unprepare(imx->clk_per); + imx_pwm_clk_disable_unprepare(chip); } return 0; @@ -367,6 +401,13 @@ static int imx_pwm_probe(struct platform_device *pdev) if (imx == NULL) return -ENOMEM; + imx->clk_ipg = devm_clk_get(&pdev->dev, "ipg"); + if (IS_ERR(imx->clk_ipg)) { + dev_err(&pdev->dev, "getting ipg clock failed with %ld\n", + PTR_ERR(imx->clk_ipg)); + return PTR_ERR(imx->clk_ipg); + } + imx->clk_per = devm_clk_get(&pdev->dev, "per"); if (IS_ERR(imx->clk_per)) { dev_err(&pdev->dev, "getting per clock failed with %ld\n", @@ -406,6 +447,8 @@ static int imx_pwm_remove(struct platform_device *pdev) if (imx == NULL) return -ENODEV; + imx_pwm_clk_disable_unprepare(&imx->chip); + return pwmchip_remove(&imx->chip); } |