Commit 173c66bf authored by Bin Meng's avatar Bin Meng Committed by Priyanka Jain
Browse files

of: extra: Introduce ofnode_phy_is_fixed_link() API



Introduce a helper API ofnode_phy_is_fixed_link() to detect whether
the ethernet controller connects to a fixed-link pseudo-PHY device.

Note there are two ways to describe a fixed PHY attached to an
Ethernet device:

- the new DT binding, where 'fixed-link' is a sub-node of the
  Ethernet device
- the old DT binding, where 'fixed-link' is a property with 5
  cells encoding various information about the fixed PHY
Signed-off-by: Bin Meng's avatarBin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass's avatarSimon Glass <sjg@chromium.org>
Reviewed-by: default avatarVladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Priyanka Jain's avatarPriyanka Jain <priyanka.jain@nxp.com>
parent 1c196b30
......@@ -130,3 +130,26 @@ int ofnode_decode_memory_region(ofnode config_node, const char *mem_type,
return 0;
}
bool ofnode_phy_is_fixed_link(ofnode eth_node, ofnode *phy_node)
{
ofnode node, subnode;
int len;
subnode = ofnode_find_subnode(eth_node, "fixed-link");
if (ofnode_valid(subnode)) {
/* new binding */
node = subnode;
} else if (ofnode_get_property(eth_node, "fixed-link", &len) &&
len == (5 * sizeof(__be32))) {
/* old binding */
node = eth_node;
} else {
return false;
}
if (phy_node)
*phy_node = node;
return true;
}
......@@ -94,4 +94,24 @@ int ofnode_decode_memory_region(ofnode config_node, const char *mem_type,
const char *suffix, fdt_addr_t *basep,
fdt_size_t *sizep);
/**
* ofnode_phy_is_fixed_link() - Detect fixed-link pseudo-PHY device
*
* This function detects whether the ethernet controller connects to a
* fixed-link pseudo-PHY device.
*
* This function supports the following two DT bindings:
* - the new DT binding, where 'fixed-link' is a sub-node of the
* Ethernet device
* - the old DT binding, where 'fixed-link' is a property with 5
* cells encoding various information about the fixed PHY
*
* If both new and old bindings exist, the new one is preferred.
*
* @param eth_node ofnode containing the fixed-link subnode/property
* @param phy_node if fixed-link PHY detected, containing the PHY ofnode
* @return true if a fixed-link pseudo-PHY device exists, false otherwise
*/
bool ofnode_phy_is_fixed_link(ofnode eth_node, ofnode *phy_node);
#endif
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