linux-kernel - Re: [PATCH 3/3] ARM: dts: omap4-sdp: add dynamic pin states for uart3/4

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Message-ID: <20130717153248.GI7656@atomide.com>
Date:	Wed, 17 Jul 2013 08:32:49 -0700
From:	Tony Lindgren <tony@...mide.com>
To:	Grygorii Strashko <grygorii.strashko@...com>
Cc:	Kevin Hilman <khilman@...aro.org>,
	linux-arm-kernel@...ts.infradead.org, linux-omap@...r.kernel.org,
	linux-kernel@...r.kernel.org, devicetree-discuss@...ts.ozlabs.org,
	Benoit Cousson <benoit.cousson@...aro.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Stephen Warren <swarren@...dotorg.org>
Subject: Re: [PATCH 3/3] ARM: dts: omap4-sdp: add dynamic pin states for
 uart3/4

* Grygorii Strashko <grygorii.strashko@...com> [130717 04:49]:
> Add dynamic "active"/"idle" pin states for uart3/4 which will be applied
> when uart3/4 state is switched from active to idle and back by Runtime
> PM or during system suspend.

This is good for testing code, but should not be merged because
omap4 has the iopad wake-ups available for uarts. So those can
be always enabled.
 
> --- a/arch/arm/boot/dts/omap4-sdp.dts
> +++ b/arch/arm/boot/dts/omap4-sdp.dts
> @@ -181,18 +181,40 @@
>  		pinctrl-single,pins = <
>  			0x100 (PIN_INPUT_PULLUP | MUX_MODE0)	/* uart3_cts_rctx.uart3_cts_rctx */
>  			0x102 (PIN_OUTPUT | MUX_MODE0)		/* uart3_rts_sd.uart3_rts_sd */
> -			0x104 (PIN_INPUT | MUX_MODE0)		/* uart3_rx_irrx.uart3_rx_irrx */
>  			0x106 (PIN_OUTPUT | MUX_MODE0)		/* uart3_tx_irtx.uart3_tx_irtx */
>  		>;
>  	};

This just need to become:
		pinctrl-single,pins = <
			...
			0x104 (WAKEUP_EN | PIN_INPUT_MUX_MODE0)	/* uart3_rx_irrx.uart3_rx_irrx */
			...
		>;
		interrupts = <GIC_SPI 74 IRQ_TYPE_LEVEL_HIGH>;
	};

And so on. For am33xx you need to remux things to GPIO for the wake-up
events, so you should maybe test on that instead.

Regards,

Tony
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