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dm: core: add clocks node scan

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Currently, all fixed-clock declared in "clocks" node in device tree
can be binded by clk_fixed_rate.c driver only if each of them have
the "simple-bus" compatible string.
This constraint has been invoked here [1].

This patch offers a solution to avoid adding "simple-bus" compatible
string to nodes that are not busses.

[1] https://patchwork.ozlabs.org/patch/558837/

Signed-off-by: Patrice Chotard <patrice.chotard@st.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Patrice Chotard 2017-09-04 14:55:56 +02:00 • committed by Simon Glass
parent e11aa602ab
commit e81c98649b
2 changed files with 46 additions and 2 deletions
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34
drivers/core/root.c
View file

@ -312,8 +312,38 @@ int dm_scan_fdt(const void *blob, bool pre_reloc_only)
#endif
return dm_scan_fdt_node(gd->dm_root, blob, 0, pre_reloc_only);
}
#else
static int dm_scan_fdt_node(struct udevice *parent, const void *blob,
int offset, bool pre_reloc_only)
{
return 0;
}
#endif
int dm_extended_scan_fdt(const void *blob, bool pre_reloc_only)
{
int node, ret;
ret = dm_scan_fdt(gd->fdt_blob, pre_reloc_only);
if (ret) {
debug("dm_scan_fdt() failed: %d\n", ret);
return ret;
}
/* bind fixed-clock */
node = ofnode_to_offset(ofnode_path("/clocks"));
/* if no DT "clocks" node, no need to go further */
if (node < 0)
return ret;
ret = dm_scan_fdt_node(gd->dm_root, gd->fdt_blob, node,
pre_reloc_only);
if (ret)
debug("dm_scan_fdt_node() failed: %d\n", ret);
return ret;
}
__weak int dm_scan_other(bool pre_reloc_only)
{
return 0;
@ -335,9 +365,9 @@ int dm_init_and_scan(bool pre_reloc_only)
}
if (CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)) {
ret = dm_scan_fdt(gd->fdt_blob, pre_reloc_only);
ret = dm_extended_scan_fdt(gd->fdt_blob, pre_reloc_only);
if (ret) {
debug("dm_scan_fdt() failed: %d\n", ret);
debug("dm_extended_scan_dt() failed: %d\n", ret);
return ret;
}
}

14
include/dm/root.h
View file

@ -55,6 +55,20 @@ int dm_scan_platdata(bool pre_reloc_only);
*/
int dm_scan_fdt(const void *blob, bool pre_reloc_only);
/**
* dm_extended_scan_fdt() - Scan the device tree and bind drivers
*
* This calls dm_scna_dft() which scans the device tree and creates a driver
* for each node. the top-level subnodes are examined and also all sub-nodes
* of "clocks" node.
*
* @blob: Pointer to device tree blob
* @pre_reloc_only: If true, bind only drivers with the DM_FLAG_PRE_RELOC
* flag. If false bind all drivers.
* @return 0 if OK, -ve on error
*/
int dm_extended_scan_fdt(const void *blob, bool pre_reloc_only);
/**
* dm_scan_other() - Scan for other devices
*