video: amba-clcd: use devm_of_find_backlight
Look up backlight device using devm_of_find_backlight(). This simplifies the code and prevents us from hardcoding the node name in the driver. v2: - Added Cc: Peter Ujfalusi Signed-off-by: Sam Ravnborg <sam@ravnborg.org> Acked-by: Linus Walleij <linus.walleij@linaro.org> Cc: Russell King <linux@armlinux.org.uk> Cc: Sam Ravnborg <sam@ravnborg.org> Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com> Cc: Peter Ujfalusi <peter.ujfalusi@ti.com> Cc: Daniel Vetter <daniel.vetter@ffwll.ch> Cc: Linus Walleij <linus.walleij@linaro.org> Cc: Jani Nikula <jani.nikula@intel.com> Cc: Douglas Anderson <dianders@chromium.org> Link: https://patchwork.freedesktop.org/patch/msgid/20200517190139.740249-2-sam@ravnborg.org
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@ -602,20 +602,17 @@ static int clcdfb_snprintf_mode(char *buf, int size, struct fb_videomode *mode)
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mode->refresh);
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}
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static int clcdfb_of_get_backlight(struct device_node *panel,
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static int clcdfb_of_get_backlight(struct device *dev,
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struct clcd_panel *clcd_panel)
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{
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struct device_node *backlight;
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struct backlight_device *backlight;
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/* Look up the optional backlight phandle */
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backlight = of_parse_phandle(panel, "backlight", 0);
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if (backlight) {
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clcd_panel->backlight = of_find_backlight_by_node(backlight);
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of_node_put(backlight);
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/* Look up the optional backlight device */
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backlight = devm_of_find_backlight(dev);
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if (IS_ERR(backlight))
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return PTR_ERR(backlight);
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if (!clcd_panel->backlight)
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return -EPROBE_DEFER;
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}
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clcd_panel->backlight = backlight;
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return 0;
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}
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@ -717,7 +714,7 @@ static int clcdfb_of_init_display(struct clcd_fb *fb)
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if (!panel)
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return -ENODEV;
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err = clcdfb_of_get_backlight(panel, fb->panel);
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err = clcdfb_of_get_backlight(&fb->dev->dev, fb->panel);
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if (err)
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return err;
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