linux-kernel - Re: [PATCHv3 1/4] pwm: Add Freescale FTM PWM driver support

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Message-ID: <20130910065146.GA30088@pengutronix.de>
Date:	Tue, 10 Sep 2013 08:51:46 +0200
From:	Sascha Hauer <s.hauer@...gutronix.de>
To:	Xiubo Li <Li.Xiubo@...escale.com>
Cc:	r65073@...escale.com, thierry.reding@...il.com,
	grant.likely@...aro.org, linux@....linux.org.uk, rob@...dley.net,
	ian.campbell@...rix.com, swarren@...dotorg.org,
	mark.rutland@....com, pawel.moll@....com, rob.herring@...xeda.com,
	linux-arm-kernel@...ts.infradead.org, linux-pwm@...r.kernel.org,
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
	linux-doc@...r.kernel.org, Jingchang Lu <b35083@...escale.com>
Subject: Re: [PATCHv3 1/4] pwm: Add Freescale FTM PWM driver support

On Fri, Sep 06, 2013 at 04:08:24PM +0800, Xiubo Li wrote:
> The FTM PWM device can be found on Vybrid VF610 Tower and Layerscape LS-1 SoCs.
> 
> +
> +static int fsl_pwm_probe(struct platform_device *pdev)
> +{
> +	int ret = 0;
> +	struct fsl_pwm_chip *fpc;
> +	struct resource *res;
> +
> +	fpc = devm_kzalloc(&pdev->dev, sizeof(*fpc), GFP_KERNEL);

You don't have to output a message when kzalloc fails, but still you
should check for the result and return an error if necessary.

With this fixed:

Reviewed-by: Sascha Hauer <s.hauer@...gutronix.de>

Sascha

> +
> +	ret = fsl_pwm_parse_clk_ps(fpc);
> +	if (ret < 0)
> +		return ret;
> +
> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +	fpc->base = devm_ioremap_resource(&pdev->dev, res);
> +	if (IS_ERR(fpc->base)) {
> +		ret = PTR_ERR(fpc->base);
> +		return ret;
> +	}
> +
> +	fpc->pinctrl = devm_pinctrl_get(&pdev->dev);
> +	if (IS_ERR(fpc->pinctrl)) {
> +		ret = PTR_ERR(fpc->pinctrl);
> +		return ret;
> +	}
> +
> +	fpc->chip.ops = &fsl_pwm_ops;
> +	fpc->chip.of_xlate = of_pwm_xlate_with_flags;
> +	fpc->chip.of_pwm_n_cells = 3;
> +	fpc->chip.base = -1;
> +	fpc->chip.npwm = FTM_MAX_CHANNEL;
> +	ret = pwmchip_add(&fpc->chip);
> +	if (ret < 0) {
> +		dev_err(&pdev->dev, "failed to add PWM chip %d\n", ret);
> +		return ret;
> +	}
> +
> +	platform_set_drvdata(pdev, fpc);
> +
> +	return 0;
> +}
> +
> +static int fsl_pwm_remove(struct platform_device *pdev)
> +{
> +	struct fsl_pwm_chip *fpc;
> +
> +	fpc = platform_get_drvdata(pdev);
> +
> +	return pwmchip_remove(&fpc->chip);
> +}
> +
> +static const struct of_device_id fsl_pwm_dt_ids[] = {
> +	{ .compatible = "fsl,vf610-ftm-pwm", },
> +	{ /* sentinel */ }
> +};
> +MODULE_DEVICE_TABLE(of, fsl_pwm_dt_ids);
> +
> +static struct platform_driver fsl_pwm_driver = {
> +	.driver = {
> +		.name = "fsl-ftm-pwm",
> +		.owner = THIS_MODULE,
> +		.of_match_table = of_match_ptr(fsl_pwm_dt_ids),
> +	},
> +	.probe = fsl_pwm_probe,
> +	.remove = fsl_pwm_remove,
> +};
> +module_platform_driver(fsl_pwm_driver);
> +
> +MODULE_DESCRIPTION("Freescale FTM PWM Driver");
> +MODULE_AUTHOR("Xiubo Li <Li.Xiubo@...escale.com>");
> +MODULE_LICENSE("GPL");
> -- 
> 1.8.0
> 
> 
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