If we set the uart compatible in the dts file like this:
------------------------------------------------------
compatible = "fsl,imx6q-uart", "fsl,imx21-uart";
------------------------------------------------------
and we set the uart compatible in the uart driver like this:
------------------------------------------------------
{ .compatible = "fsl,imx1-uart", ... },
{ .compatible = "fsl,imx21-uart", ... },
{ .compatible = "fsl,imx6q-uart", ... },
{ /* sentinel */ }
------------------------------------------------------
the current code will match the "fsl,imx21-uart" in the end.
Of course, this is not what we want. We want it to match the "fsl,imx6q-uart".
This patch rewrites the match code, and make it to check the compatible
in the order set by the DTS file.
Signed-off-by: Huang Shijie <b32...@freescale.com>
---
drivers/of/base.c | 29 +++++++++++++++++++++++++----
1 files changed, 25 insertions(+), 4 deletions(-)
diff --git a/drivers/of/base.c b/drivers/of/base.c
index 0d61fc5..b13846b 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -622,10 +622,14 @@ static
const struct of_device_id *__of_match_node(const struct of_device_id *matches,
const struct device_node *node)
{
+ struct of_device_id *old = (struct of_device_id *)matches;
+ const char *cp;
+ int cplen, l;
+
if (!matches)
return NULL;
- while (matches->name[0] || matches->type[0] || matches->compatible[0]) {
+ while (matches->name[0] || matches->type[0]) {
int match = 1;
if (matches->name[0])
match &= node->name
@@ -633,13 +637,30 @@ const struct of_device_id *__of_match_node(const struct
of_device_id *matches,
if (matches->type[0])
match &= node->type
&& !strcmp(matches->type, node->type);
- if (matches->compatible[0])
- match &= __of_device_is_compatible(node,
- matches->compatible);
if (match)
return matches;
matches++;
}
+
+ /* Check the compatible in the order set by the DTS file. */
+ cp = __of_get_property(node, "compatible", &cplen);
+ if (!cp)
+ return NULL;
+
+ while (cplen > 0) {
+ matches = old;
+
+ while (matches->compatible[0]) {
+ if (!of_compat_cmp(cp, matches->compatible,
+ strlen(matches->compatible)))
+ return matches;
+ matches++;
+ }
+
+ l = strlen(cp) + 1;
+ cp += l;
+ cplen -= l;
+ }
return NULL;
}
--
1.7.1
--
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