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SubjectRe: [net-next PATCH v1 6/7] net: dpaa2-mac: Add ACPI support for DPAA2 MAC driver
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On 30/09/2020 17:04, Calvin Johnson wrote:
> 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.
>
> Use helper function phylink_fwnode_phy_connect() to find phy_dev and
> connect to mac->phylink.
>
> Signed-off-by: Calvin Johnson <calvin.johnson@oss.nxp.com>
> ---
>
> .../net/ethernet/freescale/dpaa2/dpaa2-mac.c | 79 ++++++++++++-------
> 1 file changed, 50 insertions(+), 29 deletions(-)
>
> diff --git a/drivers/net/ethernet/freescale/dpaa2/dpaa2-mac.c b/drivers/net/ethernet/freescale/dpaa2/dpaa2-mac.c
> index 90cd243070d7..18502ee83e46 100644
> --- a/drivers/net/ethernet/freescale/dpaa2/dpaa2-mac.c
> +++ b/drivers/net/ethernet/freescale/dpaa2/dpaa2-mac.c
> @@ -3,6 +3,7 @@
>
> #include "dpaa2-eth.h"
> #include "dpaa2-mac.h"
> +#include <linux/acpi.h>
>
> #define phylink_to_dpaa2_mac(config) \
> container_of((config), struct dpaa2_mac, phylink_config)
> @@ -35,38 +36,56 @@ 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 acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
> + 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;
> +
> + 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;
> + }
There is a change of behaviour here that isn't described in the patch
description, so I'm having trouble following the intent. The original
code searches the tree for a node named "dpmacs", but the new code
constrains the search to just the parent device.

Also, because the new code path is only used in the DT case, I don't see
why the behaviour change is required. If it is a bug fix, it should be
broken out into a separate patch. If it is something else, can you
describe what the reasoning is?

I also see that the change to the code has dropped the of_node_put() on
the exit path.

>
> - 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)) {
> + pr_debug("_ADR returned %d on %s\n",
> + status, (char *)buffer.pointer);
> + 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;

Is this correct? The function prototype from patch 2 is:

struct fwnode_handle *fwnode_get_phy_node(struct fwnode_handle *fwnode)

It returns struct fwnode_handle *. Does this compile?

>
> err = phy_mode(attr.eth_if, &if_mode);
> if (!err)
> @@ -303,7 +322,7 @@ 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 phylink *phylink;
> struct dpmac_attr attr;
> int err;
> @@ -323,7 +342,7 @@ 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(&mac->mc_dev->dev, attr.id);
> if (!dpmac_node) {
> netdev_err(net_dev, "No dpmac@%d node found.\n", attr.id);
> err = -ENODEV;
> @@ -341,7 +360,7 @@ 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)) {
> @@ -352,7 +371,7 @@ int dpaa2_mac_connect(struct dpaa2_mac *mac)
>
> if (attr.link_type == DPMAC_LINK_TYPE_PHY &&
> attr.eth_if != DPMAC_ETH_IF_RGMII) {
> - err = dpaa2_pcs_create(mac, dpmac_node, attr.id);
> + err = dpaa2_pcs_create(mac, to_of_node(dpmac_node), attr.id);
> if (err)
> goto err_put_node;
> }
> @@ -361,7 +380,7 @@ 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);
> @@ -372,13 +391,14 @@ int dpaa2_mac_connect(struct dpaa2_mac *mac)
> if (mac->pcs)
> phylink_set_pcs(mac->phylink, &mac->pcs->pcs);
>
> - err = phylink_of_phy_connect(mac->phylink, dpmac_node, 0);
> + err = phylink_fwnode_phy_connect(mac->phylink, dpmac_node, 0);
> 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;
>
> @@ -387,7 +407,8 @@ int dpaa2_mac_connect(struct dpaa2_mac *mac)
> err_pcs_destroy:
> dpaa2_pcs_destroy(mac);
> 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;
>

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