It's now possible to have the DW XPCS device defined as a standard
platform device for instance in the platform DT-file. Although that
functionality is useless unless there is a way to have the device found by
the client drivers (STMMAC/DW *MAC, NXP SJA1105 Eth Switch, etc). Provide
such ability by means of the xpcs_create_fwnode() method. It needs to be
called with the device DW XPCS fwnode instance passed. That node will be
then used to find the MDIO-device instance in order to create the DW XPCS
descriptor.
Note the method semantics and name is similar to what has been recently
introduced in the Lynx PCS driver.
Signed-off-by: Serge Semin <fancer.lancer@xxxxxxxxx>
---
Changelog v2:
- Use the function name and semantics similar to the Lynx PCS driver.
- Add kdoc describing the DW XPCS create functions.
Changelog v3:
- Add the "@interface" argument kdoc to the xpcs_create_mdiodev()
function. (@Simon)
- Fix the "@fwnode" argument name in the xpcs_create_fwnode() method kdoc.
(@Simon)
- Move the return value descriptions to the "Return:" section of the
xpcs_create_mdiodev() and xpcs_create_fwnode() kdoc. (@Simon)
---
drivers/net/pcs/pcs-xpcs.c | 50 ++++++++++++++++++++++++++++++++++++
include/linux/pcs/pcs-xpcs.h | 3 +++
2 files changed, 53 insertions(+)
diff --git a/drivers/net/pcs/pcs-xpcs.c b/drivers/net/pcs/pcs-xpcs.c
index 8f7e3af64fcc..94f2f95ef425 100644
--- a/drivers/net/pcs/pcs-xpcs.c
+++ b/drivers/net/pcs/pcs-xpcs.c
@@ -10,7 +10,9 @@
#include <linux/delay.h>
#include <linux/pcs/pcs-xpcs.h>
#include <linux/mdio.h>
+#include <linux/phy.h>
#include <linux/phylink.h>
+#include <linux/property.h>
#include "pcs-xpcs.h"
@@ -1505,6 +1507,16 @@ static struct dw_xpcs *xpcs_create(struct mdio_device *mdiodev,
return ERR_PTR(ret);
}
+/**
+ * xpcs_create_mdiodev() - create a DW xPCS instance with the MDIO @addr
+ * @bus: pointer to the MDIO-bus descriptor for the device to be looked at
+ * @addr: device MDIO-bus ID
+ * @interface: requested PHY interface
+ *
+ * Return: a pointer to the DW XPCS handle if successful, otherwise -ENODEV if
+ * the PCS device couldn't be found on the bus and other negative errno related
+ * to the data allocation and MDIO-bus communications.
+ */
struct dw_xpcs *xpcs_create_mdiodev(struct mii_bus *bus, int addr,
phy_interface_t interface)
{
@@ -1529,6 +1541,44 @@ struct dw_xpcs *xpcs_create_mdiodev(struct mii_bus *bus, int addr,
}
EXPORT_SYMBOL_GPL(xpcs_create_mdiodev);
+/**
+ * xpcs_create_fwnode() - Create a DW xPCS instance from @fwnode
+ * @fwnode: fwnode handle poining to the DW XPCS device
+ * @interface: requested PHY interface
+ *
+ * Return: a pointer to the DW XPCS handle if successful, otherwise -ENODEV if
+ * the fwnode device is unavailable or the PCS device couldn't be found on the
+ * bus, -EPROBE_DEFER if the respective MDIO-device instance couldn't be found,
+ * other negative errno related to the data allocations and MDIO-bus
+ * communications.
+ */
+struct dw_xpcs *xpcs_create_fwnode(struct fwnode_handle *fwnode,
+ phy_interface_t interface)
+{
+ struct mdio_device *mdiodev;
+ struct dw_xpcs *xpcs;
+
+ if (!fwnode_device_is_available(fwnode))
+ return ERR_PTR(-ENODEV);
+
+ mdiodev = fwnode_mdio_find_device(fwnode);
+ if (!mdiodev)
+ return ERR_PTR(-EPROBE_DEFER);
+
+ xpcs = xpcs_create(mdiodev, interface);
+
+ /* xpcs_create() has taken a refcount on the mdiodev if it was
+ * successful. If xpcs_create() fails, this will free the mdio
+ * device here. In any case, we don't need to hold our reference
+ * anymore, and putting it here will allow mdio_device_put() in
+ * xpcs_destroy() to automatically free the mdio device.
+ */
+ mdio_device_put(mdiodev);
+
+ return xpcs;
+}
+EXPORT_SYMBOL_GPL(xpcs_create_fwnode);
+
void xpcs_destroy(struct dw_xpcs *xpcs)
{
if (!xpcs)
diff --git a/include/linux/pcs/pcs-xpcs.h b/include/linux/pcs/pcs-xpcs.h
index 813be644647f..b4a4eb6c8866 100644
--- a/include/linux/pcs/pcs-xpcs.h
+++ b/include/linux/pcs/pcs-xpcs.h
@@ -8,6 +8,7 @@
#define __LINUX_PCS_XPCS_H
#include <linux/clk.h>
+#include <linux/fwnode.h>
#include <linux/mdio.h>
#include <linux/phy.h>
#include <linux/phylink.h>
@@ -72,6 +73,8 @@ int xpcs_config_eee(struct dw_xpcs *xpcs, int mult_fact_100ns,
int enable);
struct dw_xpcs *xpcs_create_mdiodev(struct mii_bus *bus, int addr,
phy_interface_t interface);
+struct dw_xpcs *xpcs_create_fwnode(struct fwnode_handle *fwnode,
+ phy_interface_t interface);
void xpcs_destroy(struct dw_xpcs *xpcs);
#endif /* __LINUX_PCS_XPCS_H */
--
2.43.0
