linux-kernel - [PATCH] video: mxsfb: get supply regulator optionally

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Message-Id: <20160904042627.30182-1-stefan@agner.ch>
Date:   Sat,  3 Sep 2016 21:26:27 -0700
From:   Stefan Agner <stefan@...er.ch>
To:     plagnioj@...osoft.com, tomi.valkeinen@...com
Cc:     robh+dt@...nel.org, mark.rutland@....com,
        devicetree@...r.kernel.org, linux-fbdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, Stefan Agner <stefan@...er.ch>
Subject: [PATCH] video: mxsfb: get supply regulator optionally

The lcd-supply is meant to be optional, there are several device-
trees not specifying it and the code handles error values silently.
Therefor, avoid creating a dummy regulator (and the associated
warning) by using devm_regulator_get_optional.

While at it, document that fact also in the device-tree bindings.

Signed-off-by: Stefan Agner <stefan@...er.ch>
---
 Documentation/devicetree/bindings/display/mxsfb.txt | 3 +++
 drivers/video/fbdev/mxsfb.c                         | 2 +-
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/display/mxsfb.txt b/Documentation/devicetree/bindings/display/mxsfb.txt
index 96ec517..0bc530f 100644
--- a/Documentation/devicetree/bindings/display/mxsfb.txt
+++ b/Documentation/devicetree/bindings/display/mxsfb.txt
@@ -7,6 +7,9 @@ Required properties:
 - interrupts: Should contain lcdif interrupts
 - display : phandle to display node (see below for details)
 
+Optional properties:
+- lcd-supply: Regulator for LCD supply voltage.
+
 * display node
 
 Required properties:
diff --git a/drivers/video/fbdev/mxsfb.c b/drivers/video/fbdev/mxsfb.c
index 4e6608c..4f7570f 100644
--- a/drivers/video/fbdev/mxsfb.c
+++ b/drivers/video/fbdev/mxsfb.c
@@ -920,7 +920,7 @@ static int mxsfb_probe(struct platform_device *pdev)
 	if (IS_ERR(host->clk_disp_axi))
 		host->clk_disp_axi = NULL;
 
-	host->reg_lcd = devm_regulator_get(&pdev->dev, "lcd");
+	host->reg_lcd = devm_regulator_get_optional(&pdev->dev, "lcd");
 	if (IS_ERR(host->reg_lcd))
 		host->reg_lcd = NULL;
 
-- 
2.9.0