[Letux-kernel] [PATCH v2 28/32] ARM: dts: omap3-gta04a5: disable IrDA receiver to save power

H. Nikolaus Schaller hns at goldelico.com
Tue Jul 31 09:11:31 CEST 2018


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 at 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



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