linux-kernel - Re: [PATCH 2/2] ARM: dts: omap3: keep ssi ports by default

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Message-ID: <20151014111702.GA14340@earth>
Date:	Wed, 14 Oct 2015 13:17:02 +0200
From:	Sebastian Reichel <sre@...nel.org>
To:	Pali Rohár <pali.rohar@...il.com>
Cc:	tony@...mide.com, wsa@...-dreams.de, pavel@....cz,
	linux-omap@...r.kernel.org, linux-kernel@...r.kernel.org,
	Roger Quadros <rogerq@...com>
Subject: Re: [PATCH 2/2] ARM: dts: omap3: keep ssi ports by default

Hi Pali,

On Wed, Oct 14, 2015 at 12:53:04PM +0200, Pali Rohár wrote:
> On Wednesday 14 October 2015 13:44:16 Roger Quadros wrote:
> > Let's keep the SSI ports disabled in the omap3.dtsi to avoid
> > getting the following noise on the console for boards that don't
> > use the SSI ports.
> > 
> > "omap_ssi_port 4805a000.ssi-port: DT data is missing cawake gpio (err=-2)"
> > 
> > As omap3-n900 uses one SSI port, mark it enabled there.
> > 
> 
> Sebastian, why is second SSI port disabled on N900? It is not used or
> in DTS file are missing some definitions?

Since the second SSI port is not used on the Nokia N900. It's pins
are used for other things, e.g. as GPIO. It's easily verifiable
by checking the mux data:

$ grep -C1 "ssi2_" arch/arm/mach-omap2/mux34xx.c
	_OMAP3_MUXENTRY(CAM_D10, 109,
		"cam_d10", "ssi2_wake", NULL, NULL,
		"gpio_109", "hw_dbg8", NULL, "safe_mode"),
	_OMAP3_MUXENTRY(CAM_D2, 101,
		"cam_d2", "ssi2_rdy_tx", NULL, NULL,
		"gpio_101", "hw_dbg4", NULL, "safe_mode"),
	_OMAP3_MUXENTRY(CAM_D3, 102,
		"cam_d3", "ssi2_dat_rx", NULL, NULL,
		"gpio_102", "hw_dbg5", NULL, "safe_mode"),
	_OMAP3_MUXENTRY(CAM_D4, 103,
		"cam_d4", "ssi2_flag_rx", NULL, NULL,
		"gpio_103", "hw_dbg6", NULL, "safe_mode"),
	_OMAP3_MUXENTRY(CAM_D5, 104,
		"cam_d5", "ssi2_rdy_rx", NULL, NULL,
		"gpio_104", "hw_dbg7", NULL, "safe_mode"),
	_OMAP3_MUXENTRY(CAM_HS, 94,
		"cam_hs", "ssi2_dat_tx", NULL, NULL,
		"gpio_94", "hw_dbg0", NULL, "safe_mode"),
	_OMAP3_MUXENTRY(CAM_VS, 95,
		"cam_vs", "ssi2_flag_tx", NULL, NULL,
		"gpio_95", "hw_dbg1", NULL, "safe_mode"),

At least gpio 104 is already used for resetting the tsc2005.

-- Sebastian

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