linux-kernel - [PATCH 4.9 221/310] ARM: dts: armadillo800eva: Split LCD mux and gpio

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Message-Id: <20180411183632.047615699@linuxfoundation.org>
Date:   Wed, 11 Apr 2018 20:36:00 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Simon Horman <horms+renesas@...ge.net.au>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.9 221/310] ARM: dts: armadillo800eva: Split LCD mux and gpio

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Geert Uytterhoeven <geert+renesas@...der.be>


[ Upstream commit 13132b3f44d3600983aceb7e9920b8ebb55a7cf8 ]

Configuration of the lcd0 pinmux group and GPIO hog for the external
GPIO mux are done using a single device node, causing the "output-high"
property to be applied to both.  This will fail for the pinmux group,
but doesn't cause any harm, as the failure is ignored silently.

However, after "pinctrl: sh-pfc: propagate errors on group config", the
failure will become fatal, leading to a broken display:

    sh-pfc e6050000.pin-controller: pin_config_group_set op failed for group 102
    sh-pfc e6050000.pin-controller: Error applying setting, reverse things back
    sh-pfc e6050000.pin-controller: failed to select default state

Move the GPIO hog to its own node to fix this.

Fixes: ffd2f9a5afb730b9 ("ARM: shmobile: armadillo800eva dts: Add pinctrl and gpio-hog for lcdc0")
Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
Acked-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
Signed-off-by: Simon Horman <horms+renesas@...ge.net.au>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 arch/arm/boot/dts/r8a7740-armadillo800eva.dts |    2 ++
 1 file changed, 2 insertions(+)

--- a/arch/arm/boot/dts/r8a7740-armadillo800eva.dts
+++ b/arch/arm/boot/dts/r8a7740-armadillo800eva.dts
@@ -266,7 +266,9 @@
 	lcd0_pins: lcd0 {
 		groups = "lcd0_data24_0", "lcd0_lclk_1", "lcd0_sync";
 		function = "lcd0";
+	};
 
+	lcd0_mux {
 		/* DBGMD/LCDC0/FSIA MUX */
 		gpio-hog;
 		gpios = <176 0>;