| Message ID | 20240602143636.5839-9-fancer.lancer@gmail.com |
|---|---|
| State | New |
| Headers | show |
| Series | net: pcs: xpcs: Add memory-mapped device support | expand |
On Sun, Jun 02, 2024 at 05:36:22PM +0300, Serge Semin wrote: > 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@gmail.com> Hi Serge, Some minor nits from my side flagged by kernel-doc -none -Wall ... > diff --git a/drivers/net/pcs/pcs-xpcs.c b/drivers/net/pcs/pcs-xpcs.c ... > @@ -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 > + * @requested PHY interface An entry for @interface should go here. > + * > + * If successful, returns a pointer to the DW XPCS handle. Otherwise returns > + * -ENODEV if device couldn't be found on the bus, other negative errno related > + * to the data allocation and MDIO-bus communications. Please consider including this information as a Return: section of the Kernel doc. Likewise for xpcs_create_fwnode(). > + */ > 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 > + * @node: fwnode handle poining to the DW XPCS device s/@node/@fwnode/ > + * @interface: requested PHY interface > + * > + * If successful, returns a pointer to the DW XPCS handle. Otherwise returns > + * -ENODEV if the fwnode is marked unavailable or 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) ...
Hi Simon On Wed, Jun 05, 2024 at 06:49:20PM +0100, Simon Horman wrote: > On Sun, Jun 02, 2024 at 05:36:22PM +0300, Serge Semin wrote: > > 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@gmail.com> > > Hi Serge, > > Some minor nits from my side flagged by kernel-doc -none -Wall > > ... > > > diff --git a/drivers/net/pcs/pcs-xpcs.c b/drivers/net/pcs/pcs-xpcs.c > > ... > > > @@ -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 > > + * @requested PHY interface > > An entry for @interface should go here. Right. > > > + * > > + * If successful, returns a pointer to the DW XPCS handle. Otherwise returns > > + * -ENODEV if device couldn't be found on the bus, other negative errno related > > + * to the data allocation and MDIO-bus communications. > > Please consider including this information as a Return: section of the > Kernel doc. Likewise for xpcs_create_fwnode(). Sure. > > > + */ > > 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 > > + * @node: fwnode handle poining to the DW XPCS device > > s/@node/@fwnode/ Holy mother, so many typos in the kdoc part. I should have been more attentive. I'll fix all of them in v2. Thanks. * Special thanks for mentioning the scripts/kernel-doc I'll be using it from now on. -Serge(y) > > > + * @interface: requested PHY interface > > + * > > + * If successful, returns a pointer to the DW XPCS handle. Otherwise returns > > + * -ENODEV if the fwnode is marked unavailable or 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) > > ...
diff --git a/drivers/net/pcs/pcs-xpcs.c b/drivers/net/pcs/pcs-xpcs.c index 8f7e3af64fcc..d45fa6514884 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 + * @requested PHY interface + * + * If successful, returns a pointer to the DW XPCS handle. Otherwise returns + * -ENODEV if device couldn't be found on the bus, 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 + * @node: fwnode handle poining to the DW XPCS device + * @interface: requested PHY interface + * + * If successful, returns a pointer to the DW XPCS handle. Otherwise returns + * -ENODEV if the fwnode is marked unavailable or 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 */
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@gmail.com> --- Changelog v2: - Use the function name and semantics similar to the Lynx PCS driver. - Add kdoc describing the DW XPCS create functions. --- drivers/net/pcs/pcs-xpcs.c | 50 ++++++++++++++++++++++++++++++++++++ include/linux/pcs/pcs-xpcs.h | 3 +++ 2 files changed, 53 insertions(+)