A firmware framebuffer might also be specified via device-tree files. If
no device platform data is given, try the DT device node.
Signed-off-by: Thomas Zimmermann <tzimmerm...@suse.de>
---
drivers/gpu/drm/tiny/simplekms.c | 84 ++++++++++++++++++++++++++++++++
1 file changed, 84 insertions(+)
diff --git a/drivers/gpu/drm/tiny/simplekms.c b/drivers/gpu/drm/tiny/simplekms.c
index ac2ebfcedd22..87636307aa4f 100644
--- a/drivers/gpu/drm/tiny/simplekms.c
+++ b/drivers/gpu/drm/tiny/simplekms.c
@@ -113,6 +113,76 @@ simplefb_get_format_pd(struct drm_device *dev,
return simplefb_get_validated_format(dev, pd->format);
}
+static int
+simplefb_read_u32_of(struct drm_device *dev, struct device_node *of_node,
+ const char* name, u32 *value)
+{
+ int ret = of_property_read_u32(of_node, name, value);
+ if (ret)
+ drm_err(dev, "simplefb: can't parse framebuffer %s: error %d\n",
+ name, ret);
+ return ret;
+}
+
+static int
+simplefb_read_string_of(struct drm_device *dev, struct device_node *of_node,
+ const char* name, const char **value)
+{
+ int ret = of_property_read_string(of_node, name, value);
+ if (ret)
+ drm_err(dev, "simplefb: can't parse framebuffer %s: error %d\n",
+ name, ret);
+ return ret;
+}
+
+static int
+simplefb_get_width_of(struct drm_device *dev, struct device_node *of_node)
+{
+ int ret;
+ u32 width;
+
+ ret = simplefb_read_u32_of(dev, of_node, "width", &width);
+ if (ret)
+ return ret;
+ return simplefb_get_validated_int0(dev, "width", width);
+}
+
+static int
+simplefb_get_height_of(struct drm_device *dev, struct device_node *of_node)
+{
+ int ret;
+ u32 height;
+
+ ret = simplefb_read_u32_of(dev, of_node, "height", &height);
+ if (ret)
+ return ret;
+ return simplefb_get_validated_int0(dev, "height", height);
+}
+
+static int
+simplefb_get_stride_of(struct drm_device *dev, struct device_node *of_node)
+{
+ int ret;
+ u32 stride;
+
+ ret = simplefb_read_u32_of(dev, of_node, "stride", &stride);
+ if (ret)
+ return ret;
+ return simplefb_get_validated_int(dev, "stride", stride);
+}
+
+static const struct drm_format_info *
+simplefb_get_format_of(struct drm_device *dev, struct device_node *of_node)
+{
+ int ret;
+ const char *format;
+
+ ret = simplefb_read_string_of(dev, of_node, "format", &format);
+ if (ret)
+ return ERR_PTR(ret);
+ return simplefb_get_validated_format(dev, format);
+}
+
/*
* Simple Framebuffer device
*/
@@ -163,6 +233,7 @@ static int simplekms_device_init_fb(struct simplekms_device
*sdev)
struct drm_device *dev = &sdev->dev;
struct platform_device *pdev = sdev->pdev;
const struct simplefb_platform_data *pd = dev_get_platdata(&pdev->dev);
+ struct device_node *of_node = pdev->dev.of_node;
if (pd) {
width = simplefb_get_width_pd(dev, pd);
@@ -177,6 +248,19 @@ static int simplekms_device_init_fb(struct
simplekms_device *sdev)
format = simplefb_get_format_pd(dev, pd);
if (IS_ERR(format))
return PTR_ERR(format);
+ } else if (of_node) {
+ width = simplefb_get_width_of(dev, of_node);
+ if (width < 0)
+ return width;
+ height = simplefb_get_height_of(dev, of_node);
+ if (height < 0)
+ return height;
+ stride = simplefb_get_stride_of(dev, of_node);
+ if (stride < 0)
+ return stride;
+ format = simplefb_get_format_of(dev, of_node);
+ if (IS_ERR(format))
+ return PTR_ERR(format);
} else {
drm_err(dev, "no simplefb configuration found\n");
return -ENODEV;
--
2.27.0
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