linux-kernel - Re: [PATCH v3 1/6] usb: host: usb-st-common: Add common code required by ohci-st and ehci-st

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Date:	Wed, 6 Aug 2014 22:59:10 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Peter Griffin <peter.griffin@...aro.org>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	gregkh@...uxfoundation.org, stern@...land.harvard.edu,
	srinivas.kandagatla@...il.com, maxime.coquelin@...com,
	patrice.chotard@...com, lee.jones@...aro.org,
	devicetree@...r.kernel.org, linux-usb@...r.kernel.org
Subject: Re: [PATCH v3 1/6] usb: host: usb-st-common: Add common code required by ohci-st and ehci-st

On Wednesday 06 August 2014, Peter Griffin wrote:
> +int st_usb_platform_power_on(struct st_platform_priv *priv)
> +{
> +	int clk, ret;
> +
> +	if (priv->pwr) {
> +		ret = reset_control_deassert(priv->pwr);
> +		if (ret)
> +			return ret;
> +	}
> +
> +	if (priv->rst) {
> +		ret = 
> (priv->rst);
> +		if (ret)
> +			goto err_assert_power;
> +	}

I wouldn't make these optional, just call the functions
unconditionally and fail the probe function if they are
not available.

I'm not sure if it's worth keeping these functions in a
common file. You are adding complexity this way and I don't
think you are even saving a significant number of code lines
compared to just having two copies of them.

> +EXPORT_SYMBOL(st_usb_platform_power_on);

If you want to keep them, it would be best to make

	Arnd
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