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Date: Thu, 25 Jun 2020 07:59:19 +0000
From: Ioana Ciornei <ioana.ciornei@....com>
To: "Calvin Johnson (OSS)" <calvin.johnson@....nxp.com>,
Jeremy Linton <jeremy.linton@....com>,
Russell King - ARM Linux admin <linux@...linux.org.uk>,
Jon <jon@...id-run.com>,
Cristi Sovaiala <cristian.sovaiala@....com>,
Andrew Lunn <andrew@...n.ch>,
Andy Shevchenko <andy.shevchenko@...il.com>,
Florian Fainelli <f.fainelli@...il.com>,
"Madalin Bucur (OSS)" <madalin.bucur@....nxp.com>
CC: "linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
"linux.cj@...il.com" <linux.cj@...il.com>,
"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: RE: [net-next PATCH v1] net: dpaa2-mac: Add ACPI support for DPAA2
MAC driver
> Subject: [net-next PATCH v1] net: dpaa2-mac: Add ACPI support for DPAA2 MAC
> driver
>
> Modify dpaa2_mac_connect() to support ACPI along with DT.
> Modify dpaa2_mac_get_node() to get the dpmac fwnode from either DT or
> ACPI.
> Replace of_get_phy_mode() with fwnode_get_phy_mode() to get phy-mode for
> a dpmac_node.
> Define and use helper function dpaa2_find_phy_device() to find phy_dev that is
> later connected to mac->phylink.
>
> Signed-off-by: Calvin Johnson <calvin.johnson@....nxp.com>
>
> ---
>
> .../net/ethernet/freescale/dpaa2/dpaa2-mac.c | 114 +++++++++++++-----
> 1 file changed, 86 insertions(+), 28 deletions(-)
>
> diff --git a/drivers/net/ethernet/freescale/dpaa2/dpaa2-mac.c
> b/drivers/net/ethernet/freescale/dpaa2/dpaa2-mac.c
> index 3ee236c5fc37..163da735ab29 100644
> --- a/drivers/net/ethernet/freescale/dpaa2/dpaa2-mac.c
> +++ b/drivers/net/ethernet/freescale/dpaa2/dpaa2-mac.c
> @@ -3,6 +3,8 @@
>
> #include "dpaa2-eth.h"
> #include "dpaa2-mac.h"
> +#include <linux/acpi.h>
> +#include <linux/platform_device.h>
>
> #define phylink_to_dpaa2_mac(config) \
> container_of((config), struct dpaa2_mac, phylink_config) @@ -23,38
> +25,54 @@ static int phy_mode(enum dpmac_eth_if eth_if, phy_interface_t
> *if_mode) }
>
> /* Caller must call of_node_put on the returned value */ -static struct
> device_node *dpaa2_mac_get_node(u16 dpmac_id)
> +static struct fwnode_handle *dpaa2_mac_get_node(struct device *dev,
> + u16 dpmac_id)
> {
> - struct device_node *dpmacs, *dpmac = NULL;
> - u32 id;
> + struct fwnode_handle *dpmacs, *dpmac = NULL;
> + unsigned long long adr;
> + acpi_status status;
> int err;
> + u32 id;
>
> - dpmacs = of_find_node_by_name(NULL, "dpmacs");
> - if (!dpmacs)
> - return NULL;
> + if (is_of_node(dev->parent->fwnode)) {
> + dpmacs = device_get_named_child_node(dev->parent,
> "dpmacs");
> + if (!dpmacs)
> + return NULL;
Hi Calvin,
Unfortunately, this is breaking the OF use case.
[ 4.236045] fsl_dpaa2_eth dpni.0 (unnamed net_device) (uninitialized): No dpmac@17 node found.
[ 4.245646] fsl_dpaa2_eth dpni.0 (unnamed net_device) (uninitialized): Error connecting to the MAC endpoint
[ 4.331921] fsl_dpaa2_eth dpni.0: fsl_mc_driver_probe failed: -19
You replaced of_find_node_by_name() which searches the entire DTS
file (hence the NULL first parameter) with device_get_named_child_node(dev->parent, ..)
which only searches starting with the dev->parent device. In this case, the
parent device is dprc.1 (the root container) which is not probing on the
device tree so the associated fwnode_handle is NULL.
Regards,
Ioana
> +
> + while ((dpmac = fwnode_get_next_child_node(dpmacs,
> dpmac))) {
> + err = fwnode_property_read_u32(dpmac, "reg", &id);
> + if (err)
> + continue;
> + if (id == dpmac_id)
> + return dpmac;
> + }
>
> - while ((dpmac = of_get_next_child(dpmacs, dpmac)) != NULL) {
> - err = of_property_read_u32(dpmac, "reg", &id);
> - if (err)
> - continue;
> - if (id == dpmac_id)
> - break;
> + } else if (is_acpi_node(dev->parent->fwnode)) {
> + device_for_each_child_node(dev->parent, dpmac) {
> + status =
> acpi_evaluate_integer(ACPI_HANDLE_FWNODE(dpmac),
> + "_ADR", NULL, &adr);
> + if (ACPI_FAILURE(status)) {
> + dev_info(dev, "_ADR returned status 0x%x\n",
> status);
> + continue;
> + } else {
> + id = (u32)adr;
> + if (id == dpmac_id)
> + return dpmac;
> + }
> + }
> }
> -
> - of_node_put(dpmacs);
> -
> - return dpmac;
> + return NULL;
> }
>
> -static int dpaa2_mac_get_if_mode(struct device_node *node,
> +static int dpaa2_mac_get_if_mode(struct fwnode_handle *dpmac_node,
> struct dpmac_attr attr)
> {
> phy_interface_t if_mode;
> int err;
>
> - err = of_get_phy_mode(node, &if_mode);
> - if (!err)
> - return if_mode;
> + err = fwnode_get_phy_mode(dpmac_node);
> + if (err > 0)
> + return err;
>
> err = phy_mode(attr.eth_if, &if_mode);
> if (!err)
> @@ -227,11 +245,41 @@ bool dpaa2_mac_is_type_fixed(struct fsl_mc_device
> *dpmac_dev,
> return fixed;
> }
>
> +static struct phy_device *dpaa2_find_phy_device(struct fwnode_handle
> +*fwnode) {
> + struct fwnode_reference_args args;
> + struct platform_device *pdev;
> + struct mii_bus *mdio;
> + struct device *dev;
> + acpi_status status;
> + int addr;
> + int err;
> +
> + status = acpi_node_get_property_reference(fwnode, "mdio-handle",
> + 0, &args);
> +
> + if (ACPI_FAILURE(status) || !is_acpi_device_node(args.fwnode))
> + return NULL;
> +
> + dev = bus_find_device_by_fwnode(&platform_bus_type, args.fwnode);
> + if (IS_ERR_OR_NULL(dev))
> + return NULL;
> + pdev = to_platform_device(dev);
> + mdio = platform_get_drvdata(pdev);
> +
> + err = fwnode_property_read_u32(fwnode, "phy-channel", &addr);
> + if (err < 0 || addr < 0 || addr >= PHY_MAX_ADDR)
> + return NULL;
> +
> + return mdiobus_get_phy(mdio, addr);
> +}
> +
> int dpaa2_mac_connect(struct dpaa2_mac *mac) {
> struct fsl_mc_device *dpmac_dev = mac->mc_dev;
> struct net_device *net_dev = mac->net_dev;
> - struct device_node *dpmac_node;
> + struct fwnode_handle *dpmac_node = NULL;
> + struct phy_device *phy_dev;
> struct phylink *phylink;
> struct dpmac_attr attr;
> int err;
> @@ -251,7 +299,7 @@ int dpaa2_mac_connect(struct dpaa2_mac *mac)
>
> mac->if_link_type = attr.link_type;
>
> - dpmac_node = dpaa2_mac_get_node(attr.id);
> + dpmac_node = dpaa2_mac_get_node(&dpmac_dev->dev, attr.id);
> if (!dpmac_node) {
> netdev_err(net_dev, "No dpmac@%d node found.\n", attr.id);
> err = -ENODEV;
> @@ -269,7 +317,7 @@ int dpaa2_mac_connect(struct dpaa2_mac *mac)
> * error out if the interface mode requests them and there is no PHY
> * to act upon them
> */
> - if (of_phy_is_fixed_link(dpmac_node) &&
> + if (of_phy_is_fixed_link(to_of_node(dpmac_node)) &&
> (mac->if_mode == PHY_INTERFACE_MODE_RGMII_ID ||
> mac->if_mode == PHY_INTERFACE_MODE_RGMII_RXID ||
> mac->if_mode == PHY_INTERFACE_MODE_RGMII_TXID)) { @@ -
> 282,7 +330,7 @@ int dpaa2_mac_connect(struct dpaa2_mac *mac)
> mac->phylink_config.type = PHYLINK_NETDEV;
>
> phylink = phylink_create(&mac->phylink_config,
> - of_fwnode_handle(dpmac_node), mac-
> >if_mode,
> + dpmac_node, mac->if_mode,
> &dpaa2_mac_phylink_ops);
> if (IS_ERR(phylink)) {
> err = PTR_ERR(phylink);
> @@ -290,20 +338,30 @@ int dpaa2_mac_connect(struct dpaa2_mac *mac)
> }
> mac->phylink = phylink;
>
> - err = phylink_of_phy_connect(mac->phylink, dpmac_node, 0);
> + if (is_of_node(dpmac_node))
> + err = phylink_of_phy_connect(mac->phylink,
> + to_of_node(dpmac_node), 0);
> + else if (is_acpi_node(dpmac_node)) {
> + phy_dev = dpaa2_find_phy_device(dpmac_node);
> + if (IS_ERR(phy_dev))
> + goto err_phylink_destroy;
> + err = phylink_connect_phy(mac->phylink, phy_dev);
> + }
> if (err) {
> - netdev_err(net_dev, "phylink_of_phy_connect() = %d\n", err);
> + netdev_err(net_dev, "phylink_fwnode_phy_connect() = %d\n",
> err);
> goto err_phylink_destroy;
> }
>
> - of_node_put(dpmac_node);
> + if (is_of_node(dpmac_node))
> + of_node_put(to_of_node(dpmac_node));
>
> return 0;
>
> err_phylink_destroy:
> phylink_destroy(mac->phylink);
> err_put_node:
> - of_node_put(dpmac_node);
> + if (is_of_node(dpmac_node))
> + of_node_put(to_of_node(dpmac_node));
> err_close_dpmac:
> dpmac_close(mac->mc_io, 0, dpmac_dev->mc_handle);
> return err;
> --
> 2.17.1
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