{"id":2231134,"url":"http://patchwork.ozlabs.org/api/patches/2231134/?format=json","web_url":"http://patchwork.ozlabs.org/project/linux-tegra/patch/20260430110652.558622-18-vladimir.oltean@nxp.com/","project":{"id":21,"url":"http://patchwork.ozlabs.org/api/projects/21/?format=json","name":"Linux Tegra Development","link_name":"linux-tegra","list_id":"linux-tegra.vger.kernel.org","list_email":"linux-tegra@vger.kernel.org","web_url":null,"scm_url":null,"webscm_url":null,"list_archive_url":"","list_archive_url_format":"","commit_url_format":""},"msgid":"<20260430110652.558622-18-vladimir.oltean@nxp.com>","list_archive_url":null,"date":"2026-04-30T11:06:42","name":"[v7,phy-next,17/27] phy: introduce phy_get_max_link_rate() helper for consumers","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"82d32fb70cd6ffbcdbcca5b8f9d783b2c9292ed9","submitter":{"id":75582,"url":"http://patchwork.ozlabs.org/api/people/75582/?format=json","name":"Vladimir Oltean","email":"vladimir.oltean@nxp.com"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/linux-tegra/patch/20260430110652.558622-18-vladimir.oltean@nxp.com/mbox/","series":[{"id":502276,"url":"http://patchwork.ozlabs.org/api/series/502276/?format=json","web_url":"http://patchwork.ozlabs.org/project/linux-tegra/list/?series=502276","date":"2026-04-30T11:06:26","name":"Split Generic PHY consumer and provider","version":7,"mbox":"http://patchwork.ozlabs.org/series/502276/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/2231134/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2231134/checks/","tags":{},"related":[],"headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linux-tegra@vger.kernel.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=nxp.com header.i=@nxp.com header.a=rsa-sha256\n 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,\n\tdri-devel@lists.freedesktop.org,\n\tfreedreno@lists.freedesktop.org,\n\tlinux-arm-kernel@lists.infradead.org,\n\tlinux-arm-msm@vger.kernel.org,\n\tlinux-can@vger.kernel.org,\n\tlinux-gpio@vger.kernel.org,\n\tlinux-ide@vger.kernel.org,\n\tlinux-kernel@vger.kernel.org,\n\tlinux-media@vger.kernel.org,\n\tlinux-pci@vger.kernel.org,\n\tlinux-renesas-soc@vger.kernel.org,\n\tlinux-riscv@lists.infradead.org,\n\tlinux-rockchip@lists.infradead.org,\n\tlinux-samsung-soc@vger.kernel.org,\n\tlinux-scsi@vger.kernel.org,\n\tlinux-sunxi@lists.linux.dev,\n\tlinux-tegra@vger.kernel.org,\n\tlinux-usb@vger.kernel.org,\n\tnetdev@vger.kernel.org,\n\tspacemit@lists.linux.dev,\n\tUNGLinuxDriver@microchip.com,\n\tMarkus Schneider-Pargmann ,\n\tAndrzej Hajda ,\n\tRobert Foss ,\n\tLaurent Pinchart ,\n\tJonas Karlman ,\n\tJernej Skrabec ,\n\tMaarten Lankhorst ,\n\tMaxime Ripard ,\n\tThomas Zimmermann ,\n\tDavid Airlie ,\n\tSimona Vetter ,\n\tAndy Yan ,\n\tMarc Kleine-Budde ,\n\tVincent Mailhol ,\n\tNicolas Ferre ,\n\tAlexandre Belloni ,\n\tClaudiu Beznea ,\n\tGeert Uytterhoeven ,\n\tMagnus Damm ","Subject":"[PATCH v7 phy-next 17/27] phy: introduce phy_get_max_link_rate()\n helper for consumers","Date":"Thu, 30 Apr 2026 14:06:42 +0300","Message-Id":"<20260430110652.558622-18-vladimir.oltean@nxp.com>","X-Mailer":"git-send-email 2.34.1","In-Reply-To":"<20260430110652.558622-1-vladimir.oltean@nxp.com>","References":"<20260430110652.558622-1-vladimir.oltean@nxp.com>","Content-Transfer-Encoding":"8bit","Content-Type":"text/plain","X-ClientProxiedBy":"AM8P251CA0007.EURP251.PROD.OUTLOOK.COM\n (2603:10a6:20b:21b::12) To AM9PR04MB8585.eurprd04.prod.outlook.com\n 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c1c45e7a-d7da-4eb9-c8f9-08dea6a8a9ce","X-MS-Exchange-CrossTenant-AuthSource":"AM9PR04MB8585.eurprd04.prod.outlook.com","X-MS-Exchange-CrossTenant-AuthAs":"Internal","X-MS-Exchange-CrossTenant-OriginalArrivalTime":"30 Apr 2026 11:07:26.8222\n (UTC)","X-MS-Exchange-CrossTenant-FromEntityHeader":"Hosted","X-MS-Exchange-CrossTenant-Id":"686ea1d3-bc2b-4c6f-a92c-d99c5c301635","X-MS-Exchange-CrossTenant-MailboxType":"HOSTED","X-MS-Exchange-CrossTenant-UserPrincipalName":"\n uPbOMt4E9IwHQG4aBk9IcSFvHcpJaw3BuzcEwHQC2DmGEeVpOkPFeT5YH1kD/3dyGuUroXwsf11tNTdaJldjhA==","X-MS-Exchange-Transport-CrossTenantHeadersStamped":"VI1PR04MB7182"},"content":"Consumer drivers shouldn't dereference struct phy, not even to get to\nits attributes.\n\nWe have phy_get_bus_width() as a precedent for getting the bus_width\nattribute, so let's add phy_get_max_link_rate() and use it in DRM and\nCAN drivers.\n\nIn CAN drivers, the transceiver is acquired through devm_phy_optional_get()\nand NULL is given by the API as a non-error case, so the PHY API should\nalso tolerate NULL coming back to it. This means we can further simplify\nthe call sites that test for the NULL quality of the transceiver.\n\nSigned-off-by: Vladimir Oltean \nAcked-by: Markus Schneider-Pargmann # m_can\n---\nCc: Andrzej Hajda \nCc: Neil Armstrong \nCc: Robert Foss \nCc: Laurent Pinchart \nCc: Jonas Karlman \nCc: Jernej Skrabec \nCc: Maarten Lankhorst \nCc: Maxime Ripard \nCc: Thomas Zimmermann \nCc: David Airlie \nCc: Simona Vetter \nCc: Andy Yan \nCc: Marc Kleine-Budde \nCc: Vincent Mailhol \nCc: Nicolas Ferre \nCc: Alexandre Belloni \nCc: Claudiu Beznea \nCc: Markus Schneider-Pargmann \nCc: Geert Uytterhoeven \nCc: Magnus Damm \n\nv3->v7: none\nv2->v3: collect tag\nv1->v2: make phy_get_bus_width() NULL-tolerant to simplify CAN callers\n---\n drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c | 4 ++--\n drivers/gpu/drm/bridge/synopsys/dw-dp.c | 2 +-\n drivers/net/can/at91_can.c | 3 +--\n drivers/net/can/flexcan/flexcan-core.c | 3 +--\n drivers/net/can/m_can/m_can_platform.c | 3 +--\n drivers/net/can/rcar/rcar_canfd.c | 3 +--\n drivers/phy/phy-core.c | 9 +++++++++\n include/linux/phy/phy.h | 6 ++++++\n 8 files changed, 22 insertions(+), 11 deletions(-)","diff":"diff --git a/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c\nindex d20c0f8ad04c..87847978c1fb 100644\n--- a/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c\n+++ b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c\n@@ -1296,7 +1296,7 @@ static u32 cdns_mhdp_get_training_interval_us(struct cdns_mhdp_device *mhdp,\n \n static void cdns_mhdp_fill_host_caps(struct cdns_mhdp_device *mhdp)\n {\n-\tunsigned int link_rate;\n+\tu32 link_rate;\n \n \t/* Get source capabilities based on PHY attributes */\n \n@@ -1304,7 +1304,7 @@ static void cdns_mhdp_fill_host_caps(struct cdns_mhdp_device *mhdp)\n \tif (!mhdp->host.lanes_cnt)\n \t\tmhdp->host.lanes_cnt = 4;\n \n-\tlink_rate = mhdp->phy->attrs.max_link_rate;\n+\tlink_rate = phy_get_max_link_rate(mhdp->phy);\n \tif (!link_rate)\n \t\tlink_rate = drm_dp_bw_code_to_link_rate(DP_LINK_BW_8_1);\n \telse\ndiff --git a/drivers/gpu/drm/bridge/synopsys/dw-dp.c b/drivers/gpu/drm/bridge/synopsys/dw-dp.c\nindex 45b37885d719..137ea6679732 100644\n--- a/drivers/gpu/drm/bridge/synopsys/dw-dp.c\n+++ b/drivers/gpu/drm/bridge/synopsys/dw-dp.c\n@@ -530,7 +530,7 @@ static int dw_dp_link_parse(struct dw_dp *dp, struct drm_connector *connector)\n \n \tlink->revision = link->dpcd[DP_DPCD_REV];\n \tlink->rate = min_t(u32, min(dp->plat_data.max_link_rate,\n-\t\t\t\t dp->phy->attrs.max_link_rate * 100),\n+\t\t\t\t phy_get_max_link_rate(dp->phy) * 100),\n \t\t\t drm_dp_max_link_rate(link->dpcd));\n \tlink->lanes = min_t(u8, phy_get_bus_width(dp->phy),\n \t\t\t drm_dp_max_lane_count(link->dpcd));\ndiff --git a/drivers/net/can/at91_can.c b/drivers/net/can/at91_can.c\nindex 58da323f14d7..7749da0a58f6 100644\n--- a/drivers/net/can/at91_can.c\n+++ b/drivers/net/can/at91_can.c\n@@ -1125,8 +1125,7 @@ static int at91_can_probe(struct platform_device *pdev)\n \n \tcan_rx_offload_add_timestamp(dev, &priv->offload);\n \n-\tif (transceiver)\n-\t\tpriv->can.bitrate_max = transceiver->attrs.max_link_rate;\n+\tpriv->can.bitrate_max = phy_get_max_link_rate(transceiver);\n \n \tif (at91_is_sam9263(priv))\n \t\tdev->sysfs_groups[0] = &at91_sysfs_attr_group;\ndiff --git a/drivers/net/can/flexcan/flexcan-core.c b/drivers/net/can/flexcan/flexcan-core.c\nindex f5d22c61503f..093e48b8da58 100644\n--- a/drivers/net/can/flexcan/flexcan-core.c\n+++ b/drivers/net/can/flexcan/flexcan-core.c\n@@ -2210,8 +2210,7 @@ static int flexcan_probe(struct platform_device *pdev)\n \tpriv->reg_xceiver = reg_xceiver;\n \tpriv->transceiver = transceiver;\n \n-\tif (transceiver)\n-\t\tpriv->can.bitrate_max = transceiver->attrs.max_link_rate;\n+\tpriv->can.bitrate_max = phy_get_max_link_rate(transceiver);\n \n \tif (priv->devtype_data.quirks & FLEXCAN_QUIRK_NR_IRQ_3) {\n \t\tpriv->irq_boff = platform_get_irq(pdev, 1);\ndiff --git a/drivers/net/can/m_can/m_can_platform.c b/drivers/net/can/m_can/m_can_platform.c\nindex 56da411878af..2a0f163a683a 100644\n--- a/drivers/net/can/m_can/m_can_platform.c\n+++ b/drivers/net/can/m_can/m_can_platform.c\n@@ -131,8 +131,7 @@ static int m_can_plat_probe(struct platform_device *pdev)\n \t\tgoto probe_fail;\n \t}\n \n-\tif (transceiver)\n-\t\tmcan_class->can.bitrate_max = transceiver->attrs.max_link_rate;\n+\tmcan_class->can.bitrate_max = phy_get_max_link_rate(transceiver);\n \n \tpriv->base = addr;\n \tpriv->mram_base = mram_addr;\ndiff --git a/drivers/net/can/rcar/rcar_canfd.c b/drivers/net/can/rcar/rcar_canfd.c\nindex eaf8cac78038..9062db48d477 100644\n--- a/drivers/net/can/rcar/rcar_canfd.c\n+++ b/drivers/net/can/rcar/rcar_canfd.c\n@@ -1884,8 +1884,7 @@ static int rcar_canfd_channel_probe(struct rcar_canfd_global *gpriv, u32 ch,\n \tpriv->transceiver = transceiver;\n \tpriv->channel = ch;\n \tpriv->gpriv = gpriv;\n-\tif (transceiver)\n-\t\tpriv->can.bitrate_max = transceiver->attrs.max_link_rate;\n+\tpriv->can.bitrate_max = phy_get_max_link_rate(transceiver);\n \tpriv->can.clock.freq = fcan_freq;\n \tdev_info(dev, \"can_clk rate is %u\\n\", priv->can.clock.freq);\n \ndiff --git a/drivers/phy/phy-core.c b/drivers/phy/phy-core.c\nindex 0d0be494cfd7..737a760d97d1 100644\n--- a/drivers/phy/phy-core.c\n+++ b/drivers/phy/phy-core.c\n@@ -647,6 +647,15 @@ void phy_set_bus_width(struct phy *phy, int bus_width)\n }\n EXPORT_SYMBOL_GPL(phy_set_bus_width);\n \n+u32 phy_get_max_link_rate(struct phy *phy)\n+{\n+\tif (!phy)\n+\t\treturn 0;\n+\n+\treturn phy->attrs.max_link_rate;\n+}\n+EXPORT_SYMBOL_GPL(phy_get_max_link_rate);\n+\n /**\n * _of_phy_get() - lookup and obtain a reference to a phy by phandle\n * @np: device_node for which to get the phy\ndiff --git a/include/linux/phy/phy.h b/include/linux/phy/phy.h\nindex a7e2432ca1ae..34b656084caf 100644\n--- a/include/linux/phy/phy.h\n+++ b/include/linux/phy/phy.h\n@@ -57,6 +57,7 @@ int phy_notify_disconnect(struct phy *phy, int port);\n int phy_notify_state(struct phy *phy, union phy_notify state);\n int phy_get_bus_width(struct phy *phy);\n void phy_set_bus_width(struct phy *phy, int bus_width);\n+u32 phy_get_max_link_rate(struct phy *phy);\n #else\n static inline struct phy *phy_get(struct device *dev, const char *string)\n {\n@@ -256,6 +257,11 @@ static inline int phy_get_bus_width(struct phy *phy)\n static inline void phy_set_bus_width(struct phy *phy, int bus_width)\n {\n }\n+\n+static inline u32 phy_get_max_link_rate(struct phy *phy)\n+{\n+\treturn 0;\n+}\n #endif /* IS_ENABLED(CONFIG_GENERIC_PHY) */\n \n #endif /* __PHY_CONSUMER_H */\n","prefixes":["v7","phy-next","17/27"]}