netdev - Re: [net-next PATCH v3] drivers: net: cpsw: Add support to drive gpios for ethernet to be functional

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Message-Id: <20150915.123815.1848038420469146072.davem@davemloft.net>
Date:	Tue, 15 Sep 2015 12:38:15 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	mugunthanvnm@...com
Cc:	netdev@...r.kernel.org, tony@...mide.com, nsekhar@...com,
	linux-omap@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [net-next PATCH v3] drivers: net: cpsw: Add support to drive
 gpios for ethernet to be functional

From: Mugunthan V N <mugunthanvnm@...com>
Date: Mon, 7 Sep 2015 15:16:44 +0530

> In DRA72x EVM, by default slave 1 is connected to the onboard
> phy, but slave 2 pins are also muxed with video input module
> which is controlled by pcf857x gpio and currently to select slave
> 0 to connect to phy gpio hogging is used, but with
> omap2plus_defconfig the pcf857x gpio is built as module. So when
> using NFS on DRA72x EVM, board doesn't boot as gpio hogging do
> not set proper gpio state to connect slave 0 to phy as it is
> built as module and you do not see any errors for not setting
> gpio and just mentions dhcp reply not got.
> 
> To solve this issue, introducing "mode-gpios" in DT when gpio
> based muxing is required. This will throw a warning when gpio
> get fails and returns probe defer. When gpio-pcf857x module is
> installed, cpsw probes again and ethernet becomes functional.
> Verified this on DRA72x with pcf as module and ramdisk.
> 
> Signed-off-by: Mugunthan V N <mugunthanvnm@...com>

Applied, thanks.
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