| Message ID | 20210409134056.18740-5-a-govindraju@ti.com |
|---|---|
| State | New |
| Headers | show |
| Series | CAN TRANSCEIVER: Add support for CAN transceivers | expand |
On 4/9/21 3:40 PM, Aswath Govindraju wrote: > 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"); I think that's a bit to loud. > + } else { > + ret = phy_power_on(transceiver); Please move the phy power on/off to the ndo_open and ndo_stop callbacks. There's no need to power the transceivers if the CAN interface is down. > + 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"); Please move this check to the generic transcevier code. > + priv->cdev.can.bitrate_max = bitrate_max; > + } > + > priv->base = addr; > priv->mram_base = mram_addr; > > Marc -- Pengutronix e.K. | Marc Kleine-Budde | Embedded Linux | https://www.pengutronix.de | Vertretung West/Dortmund | Phone: +49-231-2826-924 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 |
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;