Le 01/11/2022 à 10:51, Billy Tsai a écrit :
This patch add the support of PWM controller which can be found at aspeed ast2600 soc. The pwm supoorts up to 16 channels and it's part function of multi-function device "pwm-tach controller". Signed-off-by: Billy Tsai <billy_tsai@xxxxxxxxxxxxxx>
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+static int aspeed_pwm_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + int ret; + struct aspeed_pwm_data *priv; + struct device_node *np; + struct platform_device *parent_dev; + + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + np = pdev->dev.parent->of_node; + if (!of_device_is_compatible(np, "aspeed,ast2600-pwm-tach")) + return dev_err_probe(dev, -ENODEV, + "Unsupported pwm device binding\n"); + + priv->regmap = syscon_node_to_regmap(np); + if (IS_ERR(priv->regmap)) + return dev_err_probe(dev, PTR_ERR(priv->regmap), + "Couldn't get regmap\n"); + + parent_dev = of_find_device_by_node(np); + priv->clk = devm_clk_get(&parent_dev->dev, 0);
Hi, if this helps, using devm_clk_get_enabled() would save a few lines of code. CJ
+ if (IS_ERR(priv->clk)) + return dev_err_probe(dev, PTR_ERR(priv->clk), + "Couldn't get clock\n"); +
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