[PATCH v3 2/2] can: m_can: Add support for transceiver as phy

From: Aswath Govindraju
Date: Fri Apr 16 2021 - 07:43:19 EST


From: Faiz Abbas <faiz_abbas@xxxxxx>

Add support for implementing transceiver node as phy. The max_bitrate is
obtained by getting a phy attribute.

Signed-off-by: Faiz Abbas <faiz_abbas@xxxxxx>
Signed-off-by: Aswath Govindraju <a-govindraju@xxxxxx>
---
drivers/net/can/m_can/m_can.c | 10 ++++++++++
drivers/net/can/m_can/m_can.h | 2 ++
drivers/net/can/m_can/m_can_platform.c | 13 +++++++++++++
3 files changed, 25 insertions(+)

diff --git a/drivers/net/can/m_can/m_can.c b/drivers/net/can/m_can/m_can.c
index 34073cd077e4..7d31250446c2 100644
--- a/drivers/net/can/m_can/m_can.c
+++ b/drivers/net/can/m_can/m_can.c
@@ -21,6 +21,7 @@
#include <linux/iopoll.h>
#include <linux/can/dev.h>
#include <linux/pinctrl/consumer.h>
+#include <linux/phy/phy.h>

#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 +1538,10 @@ static int m_can_close(struct net_device *dev)
close_candev(dev);
can_led_event(dev, CAN_LED_EVENT_STOP);

+ err = phy_power_off(cdev->transceiver);
+ if (err)
+ return err;
+
return 0;
}

@@ -1720,6 +1726,10 @@ static int m_can_open(struct net_device *dev)
struct m_can_classdev *cdev = netdev_priv(dev);
int err;

+ err = phy_power_on(cdev->transceiver);
+ if (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 <linux/iopoll.h>
#include <linux/can/dev.h>
#include <linux/pinctrl/consumer.h>
+#include <linux/phy/phy.h>

/* 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..f102d532b7f0 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"

@@ -67,6 +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 +103,16 @@ static int m_can_plat_probe(struct platform_device *pdev)
goto probe_fail;
}

+ transceiver = devm_phy_optional_get(&pdev->dev, NULL);
+ if (IS_ERR(transceiver)) {
+ ret = PTR_ERR(transceiver);
+ dev_err_probe(&pdev->dev, ret, "failed to get phy\n");
+ return ret;
+ }
+
+ if (transceiver)
+ mcan_class->can.bitrate_max = transceiver->attrs.max_link_rate;
+
priv->base = addr;
priv->mram_base = mram_addr;

@@ -108,6 +120,7 @@ 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