lkml.org 
[lkml]   [2021]   [Apr]   [9]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 4/4] can: m_can_platform: Add support for transceiver as phy
Date
From: Faiz Abbas <faiz_abbas@ti.com>

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@ti.com>
Signed-off-by: Aswath Govindraju <a-govindraju@ti.com>
---
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
\
 
 \ /
  Last update: 2021-04-09 15:43    [W:0.082 / U:22.492 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site