linux-kernel - Re: replacement for /sys/kernel/debug/omap

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Date:	Wed, 26 Sep 2012 08:56:58 -0400
From:	Matt Porter <mporter@...com>
To:	Koen Kooi <koen@...inion.thruhere.net>
Cc:	List List <linux-omap@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linus.walleij@...aro.org
Subject: Re: replacement for /sys/kernel/debug/omap_mux in DT/pinctrl land ?

Adding Linus W. and lkml.

On Wed, Sep 26, 2012 at 01:46:45PM +0200, Koen Kooi wrote:
> Hi,
> 
> With a patched 3.6rc7 on my beaglebone I can set the pinmux for pins using pinctrl and that seems to work. On the 3.2 vendor tree there was the omap_mux driver with an awesome debugfs interface:
> 
> # cat /sys/kernel/debug/omap_mux/lcd_data0 
> name: lcd_data0.ehrpwm2A (0x44e108a0/0x8a0 = 0x0003), b NA, t NA
> mode: OMAP_PIN_OUTPUT | OMAP_MUX_MODE3
> signals: lcd_data0 | gpmc_a0 | pr1_mii_mt0_clk | ehrpwm2A | NA | pr1_pru1_pru_r30_0 | pr1_pru1_pru_r31_0 | gpio2_6
> 
> Notice how it tells me that it's muxed the PWM in 2 ways: signal name (ehrpwm2A) and register content (0x0003). Compare to pinctrl:
> 
> root@...e-mainline:/sys/kernel/debug/pinctrl/44e10800.pinmux# grep 8a0 *
> pinconf-pins:pin 40 (44e108a0):
> pingroups:pin 40 (44e108a0)
> pinmux-pins:pin 40 (44e108a0): 4a300000.pruss (GPIO UNCLAIMED) function pinmux_pruss_led_pins group pinmux_pruss_led_pins
> pins:pin 40 (44e108a0)  pinctrl-single
> 
> What is that pin muxed to? It is part of the 'pinmux_pruss_led_pins' in the DT, but debugfs remains mute on how pin 40 is muxed.

It does seem like a pretty big gap in the pinctrl/pinmux debugfs
interface when viewed from an OMAP perspective. Ideally there would
be a pinctrl/pinmux hook to the pinmux driver to provide the detailed
h/w specific pin state info.

-Matt
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