From: Peter Rosin <peda@axentia.se>
To: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Cc: Peter Rosin <peda@axentia.se>,
Nicolas Ferre <nicolas.ferre@microchip.com>,
Alexandre Belloni <alexandre.belloni@bootlin.com>,
Rob Herring <robh+dt@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>
Subject: [PATCH] ARM: dts: at91: nattis: initialize the BLON pin as output-low early
Date: Tue, 20 Nov 2018 21:20:43 +0000 [thread overview]
Message-ID: <20181120212036.22497-1-peda@axentia.se> (raw)
The pwm-backlight driver initializes BLON (the enable gpio) to
output-high if the gpio is input on probe. Initializing the gpio
to output-low before the driver probes prevents this action by
the pwm-backlight driver and gets rid of a nasty blink of full
backlight with an uninitialized panel.
Signed-off-by: Peter Rosin <peda@axentia.se>
---
arch/arm/boot/dts/at91-nattis-2-natte-2.dts | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/arch/arm/boot/dts/at91-nattis-2-natte-2.dts b/arch/arm/boot/dts/at91-nattis-2-natte-2.dts
index 911d2c7c1500..0f6d335125e2 100644
--- a/arch/arm/boot/dts/at91-nattis-2-natte-2.dts
+++ b/arch/arm/boot/dts/at91-nattis-2-natte-2.dts
@@ -60,6 +60,8 @@
power-supply = <&bl_reg>;
enable-gpios = <&pioA 20 GPIO_ACTIVE_HIGH>;
+ pinctrl-names = "default";
+ pinctrl-0 = <&pinctrl_blon>;
};
panel: panel {
@@ -164,6 +166,12 @@
(AT91_PINCTRL_OUTPUT |
AT91_PINCTRL_OUTPUT_VAL(0))>;
};
+
+ pinctrl_blon: blon {
+ atmel,pins = <AT91_PIOA 20 AT91_PERIPH_GPIO
+ (AT91_PINCTRL_OUTPUT |
+ AT91_PINCTRL_OUTPUT_VAL(0))>;
+ };
};
};
--
2.11.0
next reply other threads:[~2018-11-20 21:21 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-20 21:20 Peter Rosin [this message]
2018-11-21 11:25 ` [PATCH] ARM: dts: at91: nattis: initialize the BLON pin as output-low early Alexandre Belloni
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