[PATCH 28/32] ARM: dts: omap3-gta04a5: disable IrDA receiver to save power

From: "H. Nikolaus Schaller" <hns@goldelico.com>
To: "Marek Belisko" <marek@goldelico.com>,
	"Benoît Cousson" <bcousson@baylibre.com>,
	"Tony Lindgren" <tony@atomide.com>,
	"Rob Herring" <robh+dt@kernel.org>,
	"Mark Rutland" <mark.rutland@arm.com>
Cc: linux-omap@vger.kernel.org, devicetree@vger.kernel.org,
	linux-kernel@vger.kernel.org, letux-kernel@openphoenux.org,
	"H. Nikolaus Schaller" <hns@goldelico.com>
Subject: [PATCH 28/32] ARM: dts: omap3-gta04a5: disable IrDA receiver to save power
Date: Wed, 25 Jul 2018 08:59:00 +0200	[thread overview]
Message-ID: <5ad0a7b127ad80d145284378323cd5a424059b57.1532501910.git.hns@goldelico.com> (raw)
In-Reply-To: <cover.1532501910.git.hns@goldelico.com>
In-Reply-To: <cover.1532501910.git.hns@goldelico.com>

The GTA04A5 has an improved IrDA circuit that can enable/disable
the receiver individually. We do not have an IrDA driver/subsystem
and hence the receiver should be actively turned off to save power,
especially in suspend.

Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>
---
 arch/arm/boot/dts/omap3-gta04a5.dts | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/arch/arm/boot/dts/omap3-gta04a5.dts b/arch/arm/boot/dts/omap3-gta04a5.dts
index e3f9e0969065..e3352cc97c91 100644
--- a/arch/arm/boot/dts/omap3-gta04a5.dts
+++ b/arch/arm/boot/dts/omap3-gta04a5.dts
@@ -25,7 +25,21 @@
 
 };
 
+&gpio5 {
+	irda_en {
+		gpio-hog;
+		gpios = <(175-160) GPIO_ACTIVE_HIGH>;
+		output-high;	/* activate gpio_175 to disable IrDA receiver */
+	};
+};
+
 &omap3_pmx_core {
+	irda_pins: pinmux_irda {
+		pinctrl-single,pins = <
+			OMAP3_CORE1_IOPAD(0x21d0, PIN_OUTPUT_PULLUP | MUX_MODE4)	/* mcspi1_cs1 = gpio175 */
+		>;
+	};
+
 	pps_pins: pinmux_pps_pins {
 		pinctrl-single,pins = <
 			OMAP3_CORE1_IOPAD(0x2138, PIN_INPUT | MUX_MODE4) /* gpin114 */
-- 
2.12.2

