linux-kernel - Re: [PATCH v5] lpc32xx: Added ethernet driver

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Message-Id: <201203062134.38077.arnd@arndb.de>
Date:	Tue, 6 Mar 2012 21:34:37 +0000
From:	Arnd Bergmann <arnd@...db.de>
To:	Roland Stigge <stigge@...com.de>
Cc:	davem@...emloft.net, jeffrey.t.kirsher@...el.com,
	alexander.h.duyck@...el.com, eilong@...adcom.com,
	ian.campbell@...rix.com, netdev@...r.kernel.org,
	w.sang@...gutronix.de, linux-kernel@...r.kernel.org,
	kevin.wells@....com, linux-arm-kernel@...ts.infradead.org,
	baruch@...s.co.il, joe@...ches.com
Subject: Re: [PATCH v5] lpc32xx: Added ethernet driver

Hi Roland,

One more thing I noticed this time:

On Tuesday 06 March 2012, Roland Stigge wrote:
> +static inline phy_interface_t lpc_phy_interface_mode(void)
> +{
> +#ifdef CONFIG_ARCH_LPC32XX_MII_SUPPORT
> +       return PHY_INTERFACE_MODE_MII;
> +#else
> +       return PHY_INTERFACE_MODE_RMII;
> +#endif
> +}
> +
> +static inline int use_iram_for_net(void)
> +{
> +#ifdef CONFIG_ARCH_LPC32XX_IRAM_FOR_NET
> +       return 1;
> +#else
> +       return 0;
> +#endif
> +}

This should eventually both become run-time options based on the device tree.
I don't know if you planned to do that anyway, but if you want the same kernel
binary to be used for systems in different configurations, you cannot have
compile-time decisions that are exclusive-or. Since you don't support device
tree yet but plan to do that in the future, you could add a comment here
about it, or you could even prepare it for that case already by passing the
device into the functions that will be required for reading the properties.

	Arnd
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