[PATCH 4/4] can: m_can_platform: Add support for transceiver as phy
From: Aswath Govindraju <hidden>
Date: 2021-04-09 13:42:03
Also in:
linux-can, linux-devicetree, linux-phy, lkml
Subsystem:
can network drivers, mcan device driver, the rest · Maintainers:
Marc Kleine-Budde, Vincent Mailhol, Markus Schneider-Pargmann, Linus Torvalds
From: Faiz Abbas <redacted> Add support for implementing transceiver node as phy. The max_bitrate is obtained by getting a phy attribute. Signed-off-by: Faiz Abbas <redacted> Signed-off-by: Aswath Govindraju <redacted> --- drivers/net/can/m_can/m_can_platform.c | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+)
diff --git a/drivers/net/can/m_can/m_can_platform.c b/drivers/net/can/m_can/m_can_platform.c
index 599de0e08cd7..4a762b5a21d8 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 <linux/platform_device.h> +#include <linux/phy/phy.h> #include "m_can.h"
@@ -67,7 +68,9 @@ 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; + u32 bitrate_max; mcan_class = m_can_class_allocate_dev(&pdev->dev, sizeof(struct m_can_plat_priv));
@@ -101,6 +104,28 @@ static int m_can_plat_probe(struct platform_device *pdev) goto probe_fail; } + transceiver = devm_phy_optional_get(&pdev->dev, "can_transceiver"); + 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_warn(&pdev->dev, "No transceiver phy found\n"); + } else { + ret = phy_power_on(transceiver); + if (ret) { + dev_err(&pdev->dev, "error powering on phy, err=%d\n", ret); + return ret; + } + /* converting from Mbps to bps */ + bitrate_max = (transceiver->attrs.max_link_rate) * 1000000; + if (!bitrate_max) + dev_warn(&pdev->dev, "Invalid value for transceiver max bitrate. Ignoring bitrate limit\n"); + priv->cdev.can.bitrate_max = bitrate_max; + } + priv->base = addr; priv->mram_base = mram_addr;
--
2.17.1