linux-kernel - Re: [Patch v7 1/3] usb: dwc3: Add Qualcomm DWC3 glue layer driver

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Date:	Mon, 30 Jun 2014 11:52:52 -0500
From:	Felipe Balbi <balbi@...com>
To:	Andy Gross <agross@...eaurora.org>
CC:	Felipe Balbi <balbi@...com>, <linux-usb@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>,
	"Ivan T. Ivanov" <iivanov@...sol.com>,
	<linux-arm-kernel@...ts.infradead.org>,
	Kumar Gala <galak@...eaurora.org>, <jackp@...eaurora.org>,
	<linux-arm-msm@...r.kernel.org>
Subject: Re: [Patch v7 1/3] usb: dwc3: Add Qualcomm DWC3 glue layer driver

Hi,

On Mon, Jun 30, 2014 at 11:03:51AM -0500, Andy Gross wrote:
> +static int dwc3_qcom_probe(struct platform_device *pdev)
> +{
> +	struct device_node *node = pdev->dev.of_node;
> +	struct dwc3_qcom *qdwc;
> +	int ret = 0;
> +
> +	qdwc = devm_kzalloc(&pdev->dev, sizeof(*qdwc), GFP_KERNEL);
> +	if (!qdwc)
> +		return -ENOMEM;
> +
> +	platform_set_drvdata(pdev, qdwc);
> +
> +	qdwc->dev = &pdev->dev;
> +
> +	qdwc->gdsc = devm_regulator_get(qdwc->dev, "gdsc");
> +
> +	qdwc->core_clk = devm_clk_get(qdwc->dev, "core");
> +	if (IS_ERR(qdwc->core_clk)) {
> +		dev_dbg(qdwc->dev, "failed to get core clock\n");
> +		return PTR_ERR(qdwc->core_clk);
> +	}
> +
> +	qdwc->iface_clk = devm_clk_get(qdwc->dev, "iface");
> +	if (IS_ERR(qdwc->iface_clk)) {
> +		dev_dbg(qdwc->dev, "failed to get iface clock, skipping\n");
> +		qdwc->iface_clk = NULL;

so this clock and sleep_clk are optional, that's fine...

> +	}
> +
> +	qdwc->sleep_clk = devm_clk_get(qdwc->dev, "sleep");
> +	if (IS_ERR(qdwc->sleep_clk)) {
> +		dev_dbg(qdwc->dev, "failed to get sleep clock, skipping\n");
> +		qdwc->sleep_clk = NULL;
> +	}
> +
> +	if (!IS_ERR(qdwc->gdsc)) {
> +		ret = regulator_enable(qdwc->gdsc);
> +		if (ret)
> +			dev_err(qdwc->dev, "cannot enable gdsc\n");
> +	}
> +
> +	clk_prepare_enable(qdwc->core_clk);
> +
> +	if (qdwc->iface_clk)
> +		clk_prepare_enable(qdwc->iface_clk);

... right here you can drop the NULL check because clk_prepare_enable()
is safe against NULL pointers.

-- 
balbi

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