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pwm: imx27: Use 32k clock if it is supplied 

The PWM in i.MX8qxp MIPI subsystem needs to use the
'32k' clock to work properly.  This patch gets this
clock in the PWM driver and uses it if it is supplied.

Signed-off-by: Liu Ying <victor.liu@nxp.com>
5.4-rM2-2.2.x-imx-squashed
Liu Ying 2019-11-06 15:27:29 +08:00 committed by Dong Aisheng
parent 219d54332a
commit 055889789c
1 changed files with 29 additions and 8 deletions
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37
drivers/pwm/pwm-imx27.c
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@ -83,6 +83,7 @@
struct pwm_imx27_chip {
struct clk *clk_ipg;
struct clk *clk_per;
struct clk *clk_32k;
void __iomem *mmio_base;
struct pwm_chip chip;
};
@ -94,17 +95,28 @@ static int pwm_imx27_clk_prepare_enable(struct pwm_chip *chip)
struct pwm_imx27_chip *imx = to_pwm_imx27_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;
if (imx->clk_32k) {
ret = clk_prepare_enable(imx->clk_32k);
if (ret)
goto err1;
}
ret = clk_prepare_enable(imx->clk_ipg);
if (ret)
goto err2;
ret = clk_prepare_enable(imx->clk_per);
if (ret)
goto err3;
return 0;
err3:
clk_disable_unprepare(imx->clk_ipg);
err2:
if (imx->clk_32k)
clk_disable_unprepare(imx->clk_32k);
err1:
return ret;
}
static void pwm_imx27_clk_disable_unprepare(struct pwm_chip *chip)
@ -113,6 +125,8 @@ static void pwm_imx27_clk_disable_unprepare(struct pwm_chip *chip)
clk_disable_unprepare(imx->clk_per);
clk_disable_unprepare(imx->clk_ipg);
if (imx->clk_32k)
clk_disable_unprepare(imx->clk_32k);
}
static void pwm_imx27_get_state(struct pwm_chip *chip,
@ -321,6 +335,13 @@ static int pwm_imx27_probe(struct platform_device *pdev)
return ret;
}
imx->clk_32k = devm_clk_get_optional(&pdev->dev, "32k");
if (IS_ERR(imx->clk_32k)) {
dev_err(&pdev->dev, "getting 32k clock failed with %ld\n",
PTR_ERR(imx->clk_32k));
return PTR_ERR(imx->clk_32k);
}
imx->chip.ops = &pwm_imx27_ops;
imx->chip.dev = &pdev->dev;
imx->chip.base = -1;