On 4/15/21 5:46 PM, Aswath Govindraju wrote:
> 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..82d4f1a15dd7 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(&pdev->dev, "error while getting phy, err=%d\n", ret);
please use dev_err_probe(), as the probing might be deferred and this is not an
error.
> + return ret;
> + }
> +
> + if (transceiver)
> + priv->cdev.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;
>
>
Marc
--
Pengutronix e.K. | Marc Kleine-Budde |
Embedded Linux | https://www.pengutronix.de |
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