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Message-Id: <1363968949-12151-4-git-send-email-g.liakhovetski@gmx.de>
Date: Fri, 22 Mar 2013 17:15:49 +0100
From: Guennadi Liakhovetski <g.liakhovetski@....de>
To: linux-kernel@...r.kernel.org
Cc: Mark Brown <broonie@...nsource.wolfsonmicro.com>,
Magnus Damm <magnus.damm@...il.com>,
Simon Horman <horms@...ge.net.au>,
devicetree-discuss@...ts.ozlabs.org,
Samuel Ortiz <sameo@...ux.intel.com>,
Richard Purdie <rpurdie@...ys.net>,
Andrew Morton <akpm@...ux-foundation.org>,
linux-fbdev@...r.kernel.org,
Guennadi Liakhovetski <g.liakhovetski@....de>,
Guennadi Liakhovetski <g.liakhovetski+renesas@...il.com>
Subject: [PATCH v3 3/3] backlight: as3711: add OF support
Add support for configuring AS3711 backlight driver from DT.
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski+renesas@...il.com>
Reviwed-by: Mark Brown <broonie@...nsource.wolfsonmicro.com>
---
drivers/video/backlight/as3711_bl.c | 118 ++++++++++++++++++++++++++++++++++-
1 files changed, 117 insertions(+), 1 deletions(-)
diff --git a/drivers/video/backlight/as3711_bl.c b/drivers/video/backlight/as3711_bl.c
index 41d52fe..123887c 100644
--- a/drivers/video/backlight/as3711_bl.c
+++ b/drivers/video/backlight/as3711_bl.c
@@ -258,6 +258,109 @@ static int as3711_bl_register(struct platform_device *pdev,
return 0;
}
+static int as3711_backlight_parse_dt(struct device *dev)
+{
+ struct as3711_bl_pdata *pdata = dev_get_platdata(dev);
+ struct device_node *bl =
+ of_find_node_by_name(dev->parent->of_node, "backlight"), *fb;
+ int ret;
+
+ if (!bl) {
+ dev_dbg(dev, "backlight node not found\n");
+ return -ENODEV;
+ }
+
+ fb = of_parse_phandle(bl, "su1-dev", 0);
+ if (fb) {
+ pdata->su1_fb = fb->full_name;
+
+ ret = of_property_read_u32(bl, "su1-max-uA", &pdata->su1_max_uA);
+ if (pdata->su1_max_uA <= 0)
+ ret = -EINVAL;
+ if (ret < 0)
+ return ret;
+ }
+
+ fb = of_parse_phandle(bl, "su2-dev", 0);
+ if (fb) {
+ int count = 0;
+
+ pdata->su2_fb = fb->full_name;
+
+ ret = of_property_read_u32(bl, "su2-max-uA", &pdata->su2_max_uA);
+ if (pdata->su2_max_uA <= 0)
+ ret = -EINVAL;
+ if (ret < 0)
+ return ret;
+
+ if (of_find_property(bl, "su2-feedback-voltage", NULL)) {
+ pdata->su2_feedback = AS3711_SU2_VOLTAGE;
+ count++;
+ }
+ if (of_find_property(bl, "su2-feedback-curr1", NULL)) {
+ pdata->su2_feedback = AS3711_SU2_CURR1;
+ count++;
+ }
+ if (of_find_property(bl, "su2-feedback-curr2", NULL)) {
+ pdata->su2_feedback = AS3711_SU2_CURR2;
+ count++;
+ }
+ if (of_find_property(bl, "su2-feedback-curr3", NULL)) {
+ pdata->su2_feedback = AS3711_SU2_CURR3;
+ count++;
+ }
+ if (of_find_property(bl, "su2-feedback-curr-auto", NULL)) {
+ pdata->su2_feedback = AS3711_SU2_CURR_AUTO;
+ count++;
+ }
+ if (count != 1)
+ return -EINVAL;
+
+ count = 0;
+ if (of_find_property(bl, "su2-fbprot-lx-sd4", NULL)) {
+ pdata->su2_fbprot = AS3711_SU2_LX_SD4;
+ count++;
+ }
+ if (of_find_property(bl, "su2-fbprot-gpio2", NULL)) {
+ pdata->su2_fbprot = AS3711_SU2_GPIO2;
+ count++;
+ }
+ if (of_find_property(bl, "su2-fbprot-gpio3", NULL)) {
+ pdata->su2_fbprot = AS3711_SU2_GPIO3;
+ count++;
+ }
+ if (of_find_property(bl, "su2-fbprot-gpio4", NULL)) {
+ pdata->su2_fbprot = AS3711_SU2_GPIO4;
+ count++;
+ }
+ if (count != 1)
+ return -EINVAL;
+
+ count = 0;
+ if (of_find_property(bl, "su2-auto-curr1", NULL)) {
+ pdata->su2_auto_curr1 = true;
+ count++;
+ }
+ if (of_find_property(bl, "su2-auto-curr2", NULL)) {
+ pdata->su2_auto_curr2 = true;
+ count++;
+ }
+ if (of_find_property(bl, "su2-auto-curr3", NULL)) {
+ pdata->su2_auto_curr3 = true;
+ count++;
+ }
+
+ /*
+ * At least one su2-auto-curr* must be specified iff
+ * AS3711_SU2_CURR_AUTO is used
+ */
+ if (!count ^ (pdata->su2_feedback != AS3711_SU2_CURR_AUTO))
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
static int as3711_backlight_probe(struct platform_device *pdev)
{
struct as3711_bl_pdata *pdata = dev_get_platdata(&pdev->dev);
@@ -267,11 +370,24 @@ static int as3711_backlight_probe(struct platform_device *pdev)
unsigned int max_brightness;
int ret;
- if (!pdata || (!pdata->su1_fb && !pdata->su2_fb)) {
+ if (!pdata) {
dev_err(&pdev->dev, "No platform data, exiting...\n");
return -ENODEV;
}
+ if (pdev->dev.parent->of_node) {
+ ret = as3711_backlight_parse_dt(&pdev->dev);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "DT parsing failed: %d\n", ret);
+ return ret;
+ }
+ }
+
+ if (!pdata->su1_fb && !pdata->su2_fb) {
+ dev_err(&pdev->dev, "No framebuffer specified\n");
+ return -EINVAL;
+ }
+
/*
* Due to possible hardware damage I chose to block all modes,
* unsupported on my hardware. Anyone, wishing to use any of those modes
--
1.7.2.5
--
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