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Miller" , Jakub Kicinski , linux-kernel@vger.kernel.org Cc: Andrew Lunn , Heiner Kallweit , Russell King , Sean Anderson Subject: [RFC net-next PATCH 06/16] net: phylink: Add function for optionally adding a PCS Date: Mon, 4 Oct 2021 15:15:17 -0400 Message-Id: <20211004191527.1610759-7-sean.anderson@seco.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20211004191527.1610759-1-sean.anderson@seco.com> References: <20211004191527.1610759-1-sean.anderson@seco.com> X-ClientProxiedBy: MN2PR08CA0023.namprd08.prod.outlook.com (2603:10b6:208:239::28) To DB7PR03MB4523.eurprd03.prod.outlook.com (2603:10a6:10:19::27) MIME-Version: 1.0 Received: from plantagenet.inhand.com (50.195.82.171) by MN2PR08CA0023.namprd08.prod.outlook.com (2603:10b6:208:239::28) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4566.17 via Frontend Transport; Mon, 4 Oct 2021 19:15:55 +0000 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 8605d6c2-d4bc-42d7-fe2c-08d9876b6424 X-MS-TrafficTypeDiagnostic: DB9PR03MB7434: X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:8882; X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: ajGPar/7hmVms+Qk6ZlCa4BKsbQjF+7wwsoTo7O2Nw6MvIyq+j68DvU8udMJXafgs1dC+IOiEg9GnD9LrV4gqouWae+d1Hg/X6cRuF4UYp49W1ukgE8yBQoqDLqVJT3ecN1Ki+APymebhHbFP1MWJYtUWhVJVKw85Xiz9iHKUBc0KjSOh4NaZibdJsCY5As6IlZ6y899Bx7UcFVYKOYwhFcvbzJSVe/ZM7Uom6gEGkLaLVaA2tAHUX1HggZZ/OrBawtjMW1Dae4YmBm3Qhr2PXuvBbvWRA12PwYPnn0TxSXqZ/iFUuCke2G1H2ss07Rz9YIekv9z9xNFA0FmzhBT5nSvBj1MiPXQD0agVoUlGMtPcM+MX4Qay+4U57xsLL2LaySIG59ive+9IcJtjJ7QAbH4OOFiECUGQJWp5H0Fd+SD4YY8zD7mzk+6QMzSQVDeUXkke0pik0PrC1GWJ/Iqdk2XQwxCAHhMvRwIORPNYt8r3NYhHOC6wlDrczNTzPqGnn1TwZ/IAOcnaTHIEOS/ul1vCyd8L9kLwhFhBoX4VXn0lB4kF2lt2/Y7RiycKN9Izg+n2bCXIgfqWPS+rqrDY1DJFg5uvapP95PMpvYKGMVxaDhjUOwv4WyOoGO3HWgArn+oC8T101YGgLUL8GFmXG9vAG0QVOzreO3yo/TxhJcQVdMtWuzeE4Yu+jOpgwFvWGbDPtyUiJK2p8Udz9R6Og== X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:DB7PR03MB4523.eurprd03.prod.outlook.com;PTR:;CAT:NONE;SFS:(366004)(1076003)(86362001)(4326008)(44832011)(6486002)(5660300002)(66946007)(508600001)(38350700002)(83380400001)(52116002)(956004)(66556008)(66476007)(38100700002)(110136005)(6506007)(2906002)(186003)(8936002)(316002)(8676002)(2616005)(54906003)(26005)(6666004)(107886003)(36756003)(6512007);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: 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 X-OriginatorOrg: seco.com X-MS-Exchange-CrossTenant-Network-Message-Id: 8605d6c2-d4bc-42d7-fe2c-08d9876b6424 X-MS-Exchange-CrossTenant-AuthSource: DB7PR03MB4523.eurprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 04 Oct 2021 19:15:56.2833 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: bebe97c3-6438-442e-ade3-ff17aa50e733 X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: XrOZ1w1wCz7LRfyzlBeggUJwWTnk0i92v1OdpylDF/5G10fz1UWaU9Ojmw67GH54co7PEZnd/H2QS57AP8wugA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: DB9PR03MB7434 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org X-Patchwork-State: RFC This adds a function to set the PCS only if there is not one currently set. The intention here is to allow MAC drivers to have a "default" PCS (such as an internal one) which may be used when one has not been set via the device tree. This allows for backwards compatibility for cases where a PCS was automatically attached if necessary. Signed-off-by: Sean Anderson --- drivers/net/phy/phylink.c | 26 ++++++++++++++++++++++++++ include/linux/phylink.h | 1 + 2 files changed, 27 insertions(+) diff --git a/drivers/net/phy/phylink.c b/drivers/net/phy/phylink.c index 046fdac3597d..f82dc0f87f40 100644 --- a/drivers/net/phy/phylink.c +++ b/drivers/net/phy/phylink.c @@ -871,6 +871,32 @@ int phylink_set_pcs(struct phylink *pl, struct phylink_pcs *pcs) } EXPORT_SYMBOL_GPL(phylink_set_pcs); +/** + * phylink_set_pcs_weak() - optionally set the current PCS for phylink to use + * @pl: a pointer to a &struct phylink returned from phylink_create() + * @pcs: a pointer to the &struct phylink_pcs + * + * Bind the MAC PCS to phylink only if there is no currently-bound PCS. This + * may be called to set a "default" PCS, such as an internal PCS which was + * previously handled by the MAC driver directly. Otherwise, this function + * behaves like phylink_set_pcs(); + * + * Context: may sleep. + * Return: 1 if the PCS was set, 0 if it was not, or -errno on failure. + */ +int phylink_set_pcs_weak(struct phylink *pl, struct phylink_pcs *pcs) +{ + int ret; + + if (!pl->pcs) { + ret = phylink_set_pcs(pl, pcs); + return ret ? ret : 1; + } + + return 0; +} +EXPORT_SYMBOL_GPL(phylink_set_pcs_weak); + static struct phylink_pcs *phylink_find_pcs(struct fwnode_handle *fwnode) { struct phylink_pcs *pcs; diff --git a/include/linux/phylink.h b/include/linux/phylink.h index d60756b36ad3..bd0ce707d098 100644 --- a/include/linux/phylink.h +++ b/include/linux/phylink.h @@ -442,6 +442,7 @@ void pcs_link_up(struct phylink_pcs *pcs, unsigned int mode, int phylink_register_pcs(struct phylink_pcs *pcs); void phylink_unregister_pcs(struct phylink_pcs *pcs); int phylink_set_pcs(struct phylink *pl, struct phylink_pcs *pcs); +int phylink_set_pcs_weak(struct phylink *pl, struct phylink_pcs *pcs); struct phylink *phylink_create(struct phylink_config *, struct fwnode_handle *, phy_interface_t iface,