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