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Miller" , Jakub Kicinski , Rob Herring , Kishon Vijay Abraham I , Vinod Koul , , , Vignesh Raghavendra , Lokesh Vutla , Grygorii Strashko , Aswath Govindraju Subject: [PATCH v2 6/6] can: m_can: Add support for transceiver as phy Date: Wed, 14 Apr 2021 19:35:21 +0530 Message-ID: <20210414140521.11463-7-a-govindraju@ti.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20210414140521.11463-1-a-govindraju@ti.com> References: <20210414140521.11463-1-a-govindraju@ti.com> MIME-Version: 1.0 Content-Type: text/plain X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 To: unlisted-recipients:; (no To-header on input) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Faiz Abbas Add support for implementing transceiver node as phy. The max_bitrate is obtained by getting a phy attribute. Signed-off-by: Faiz Abbas Signed-off-by: Aswath Govindraju --- drivers/net/can/m_can/m_can.c | 18 ++++++++++++++++++ drivers/net/can/m_can/m_can.h | 2 ++ drivers/net/can/m_can/m_can_platform.c | 15 +++++++++++++++ 3 files changed, 35 insertions(+) diff --git a/drivers/net/can/m_can/m_can.c b/drivers/net/can/m_can/m_can.c index 34073cd077e4..4807a1f69cc7 100644 --- a/drivers/net/can/m_can/m_can.c +++ b/drivers/net/can/m_can/m_can.c @@ -21,6 +21,7 @@ #include #include #include +#include #include "m_can.h" @@ -1514,6 +1515,7 @@ static void m_can_stop(struct net_device *dev) static int m_can_close(struct net_device *dev) { struct m_can_classdev *cdev = netdev_priv(dev); + int err; netif_stop_queue(dev); @@ -1536,6 +1538,14 @@ static int m_can_close(struct net_device *dev) close_candev(dev); can_led_event(dev, CAN_LED_EVENT_STOP); + if (cdev->transceiver) { + err = phy_power_off(cdev->transceiver); + if (err) { + netdev_err(dev, "error powering off phy, err=%d\n", err); + return err; + } + } + return 0; } @@ -1720,6 +1730,14 @@ static int m_can_open(struct net_device *dev) struct m_can_classdev *cdev = netdev_priv(dev); int err; + if (cdev->transceiver) { + err = phy_power_on(cdev->transceiver); + if (err) { + netdev_err(dev, "error powering on phy, err=%d\n", err); + return err; + } + } + err = m_can_clk_start(cdev); if (err) return err; diff --git a/drivers/net/can/m_can/m_can.h b/drivers/net/can/m_can/m_can.h index ace071c3e58c..38cad068abad 100644 --- a/drivers/net/can/m_can/m_can.h +++ b/drivers/net/can/m_can/m_can.h @@ -28,6 +28,7 @@ #include #include #include +#include /* m_can lec values */ enum m_can_lec_type { @@ -82,6 +83,7 @@ struct m_can_classdev { struct workqueue_struct *tx_wq; struct work_struct tx_work; struct sk_buff *tx_skb; + struct phy *transceiver; struct can_bittiming_const *bit_timing; struct can_bittiming_const *data_timing; diff --git a/drivers/net/can/m_can/m_can_platform.c b/drivers/net/can/m_can/m_can_platform.c index 599de0e08cd7..566ba25fb186 100644 --- a/drivers/net/can/m_can/m_can_platform.c +++ b/drivers/net/can/m_can/m_can_platform.c @@ -6,6 +6,7 @@ // Copyright (C) 2018-19 Texas Instruments Incorporated - http://www.ti.com/ #include +#include #include "m_can.h" @@ -67,6 +68,7 @@ static int m_can_plat_probe(struct platform_device *pdev) struct resource *res; void __iomem *addr; void __iomem *mram_addr; + struct phy *transceiver; int irq, ret = 0; mcan_class = m_can_class_allocate_dev(&pdev->dev, @@ -101,6 +103,18 @@ static int m_can_plat_probe(struct platform_device *pdev) goto probe_fail; } + transceiver = devm_of_phy_optional_get_by_index(&pdev->dev, pdev->dev.of_node, 0); + if (IS_ERR(transceiver)) { + ret = PTR_ERR(transceiver); + dev_err(&pdev->dev, "error while getting phy, err=%d\n", ret); + return ret; + } + + if (!transceiver) + dev_info(&pdev->dev, "No transceiver phy found\n"); + else + priv->cdev.can.bitrate_max = transceiver->attrs.max_link_rate; + priv->base = addr; priv->mram_base = mram_addr; @@ -108,6 +122,7 @@ static int m_can_plat_probe(struct platform_device *pdev) mcan_class->pm_clock_support = 1; mcan_class->can.clock.freq = clk_get_rate(mcan_class->cclk); mcan_class->dev = &pdev->dev; + mcan_class->transceiver = transceiver; mcan_class->ops = &m_can_plat_ops; -- 2.17.1