On 02/06/2013 09:56 AM, Sean Paul wrote:
On Tue, Feb 5, 2013 at 4:42 PM, Stephen Warren <swarren@xxxxxxxxxxxxx> wrote:
On 02/05/2013 05:37 PM, Sean Paul wrote:
On Tue, Feb 5, 2013 at 4:22 PM, Stephen Warren <swarren@xxxxxxxxxxxxx> wrote:
n 02/05/2013 04:42 PM, Sean Paul wrote:
Use the compatible string in the device tree to determine which
registers/functions to use in the HDMI driver. Also changes the
references from v13 to 4210 and v14 to 4212 to reflect the IP
block version instead of the HDMI version.
diff --git a/Documentation/devicetree/bindings/drm/exynos/hdmi.txt b/Documentation/devicetree/bindings/drm/exynos/hdmi.txt
Binding looks sane to me.
diff --git a/drivers/gpu/drm/exynos/exynos_hdmi.c b/drivers/gpu/drm/exynos/exynos_hdmi.c
#ifdef CONFIG_OF
static struct of_device_id hdmi_match_types[] = {
{
- .compatible = "samsung,exynos5-hdmi",
- .data = (void *)HDMI_TYPE14,
+ .compatible = "samsung,exynos4-hdmi",
}, {
/* end node */
}
Why not fill in all the "base" compatible values there (I think you need
this anyway so that DTs don't all have to be compatible with
samsung,exynos4-hdmi), with .data containing the HDMI_VER_EXYNOS*
values, then ...
At the moment, all DTs have to be compatible with exynos4-hdmi since
it provides the base for the current driver. The driver uses 4210 and
4212 to differentiate between different register addresses and
features, but most things are just exynos4-hdmi compatible.
The DT nodes should include only the compatible values that the HW is
actually compatible with. If the HW isn't compatible with exynos4-hdmi,
that value shouldn't be in the compatible property, but instead whatever
the "base" value that the HW really is compatible with. The driver can
support multiple "base" compatible values from this table.
All devices that use this driver are compatible, at some level, with
exynos4-hdmi, so I think its usage is correct here.
@@ -2218,17 +2217,18 @@ static int hdmi_probe(struct platform_device *pdev)
+
+ if (of_device_is_compatible(dev->of_node, "samsung,exynos4210-hdmi"))
+ hdata->version |= HDMI_VER_EXYNOS4210;
+ if (of_device_is_compatible(dev->of_node, "samsung,exynos4212-hdmi"))
+ hdata->version |= HDMI_VER_EXYNOS4212;
+ if (of_device_is_compatible(dev->of_node, "samsung,exynos5250-hdmi"))
+ hdata->version |= HDMI_VER_EXYNOS5250;
But this way can make unnecessary combinations, e.g. exynos4210-hdmi +
exynos5250-hdmi.
Instead of that, do roughly:
match = of_match_device(hdmi_match_types, &pdev->dev);
if (match)
hdata->version |= (int)match->data;
That way, it's all table-based. Any future additions to
hdmi_match_types[] won't require another if statement to be added to
probe().
I don't think it's that easy. of_match_device returns the first match
from the device table, so I'd still need to iterate through the
matches. I could still break this out into a table, but I don't think
of_match_device is the right way to probe it.
You shouldn't have to iterate over multiple matches. of_match_device()
is supposed to return the match for the first entry in the compatible
property, then if there was no match, move on to looking at the next
entry in the compatible property, etc. In practice, I think it's still
not implemented quite correctly for this, but you can make it work by
putting the newest compatible value first in the match table.
I think the only way that works is if you hardcode the compatible
versions in the driver, like this:
static struct of_device_id hdmi_match_types[] = {
{
.compatible = "samsung,exynos5250-hdmi",
.data = (void *)(HDMI_VER_EXYNOS5250 | HDMI_VER_EXYNOS4212);
}, {
.compatible = "samsung,exynos4212-hdmi",
.data = (void *)HDMI_VER_EXYNOS4212;
}, {
.compatible = "samsung,exynos4210-hdmi",
.data = (void *)HDMI_VER_EXYNOS4210;
}, {
/* end node */
}
};
I think this makes driver more clearly. We just see device tables and we
can know device uses which version.
In that case, it eliminates the benefit of using device tree to
determine the compatible bits. I hope I'm just being thick and missing
something.
Sean
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