linux-kernel - Re: [PATCH v2 2/2] can: flexcan: add transceiver capabilities

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Message-ID: <20250220155712.GB43726@debian>
Date: Thu, 20 Feb 2025 16:57:12 +0100
From: Dimitri Fedrau <dima.fedrau@...il.com>
To: Marc Kleine-Budde <mkl@...gutronix.de>
Cc: Dimitri Fedrau via B4 Relay <devnull+dimitri.fedrau.liebherr.com@...nel.org>,
	Vincent Mailhol <mailhol.vincent@...adoo.fr>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, linux-can@...r.kernel.org,
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
	Dimitri Fedrau <dimitri.fedrau@...bherr.com>
Subject: Re: [PATCH v2 2/2] can: flexcan: add transceiver capabilities

Am Thu, Feb 20, 2025 at 09:43:13AM +0100 schrieb Marc Kleine-Budde:
> On 20.02.2025 09:22:11, Dimitri Fedrau via B4 Relay wrote:
> > From: Dimitri Fedrau <dimitri.fedrau@...bherr.com>
> > 
> > Currently the flexcan driver does only support adding PHYs by using the
> > "old" regulator bindings. Add support for CAN transceivers as a PHY. Add
> > the capability to ensure that the PHY is in operational state when the link
> > is set to an "up" state.
> > 
> > Signed-off-by: Dimitri Fedrau <dimitri.fedrau@...bherr.com>
> > ---
> >  drivers/net/can/flexcan/flexcan-core.c | 30 ++++++++++++++++++++++++------
> >  drivers/net/can/flexcan/flexcan.h      |  1 +
> >  2 files changed, 25 insertions(+), 6 deletions(-)
> > 
> > diff --git a/drivers/net/can/flexcan/flexcan-core.c b/drivers/net/can/flexcan/flexcan-core.c
> > index b347a1c93536d54efaa5f7d3347bd47c20860b3e..45d9a6957d9a806ed80d810a6a5f7eb99fcc702c 100644
> > --- a/drivers/net/can/flexcan/flexcan-core.c
> > +++ b/drivers/net/can/flexcan/flexcan-core.c
> > @@ -30,6 +30,7 @@
> >  #include <linux/property.h>
> >  #include <linux/regmap.h>
> >  #include <linux/regulator/consumer.h>
> > +#include <linux/phy/phy.h>
> >  
> >  #include "flexcan.h"
> >  
> > @@ -644,18 +645,22 @@ static void flexcan_clks_disable(const struct flexcan_priv *priv)
> >  
> >  static inline int flexcan_transceiver_enable(const struct flexcan_priv *priv)
> >  {
> > -	if (!priv->reg_xceiver)
> > -		return 0;
> > +	if (priv->reg_xceiver)
> > +		return regulator_enable(priv->reg_xceiver);
> > +	else if (priv->transceiver)
> > +		return phy_power_on(priv->transceiver);
> >  
> > -	return regulator_enable(priv->reg_xceiver);
> > +	return 0;
> >  }
> >  
> >  static inline int flexcan_transceiver_disable(const struct flexcan_priv *priv)
> >  {
> > -	if (!priv->reg_xceiver)
> > -		return 0;
> > +	if (priv->reg_xceiver)
> > +		return regulator_disable(priv->reg_xceiver);
> > +	else if (priv->transceiver)
> > +		return phy_power_off(priv->transceiver);
> >  
> > -	return regulator_disable(priv->reg_xceiver);
> > +	return 0;
> >  }
> >  
> >  static int flexcan_chip_enable(struct flexcan_priv *priv)
> > @@ -2086,6 +2091,7 @@ static int flexcan_probe(struct platform_device *pdev)
> >  	struct net_device *dev;
> >  	struct flexcan_priv *priv;
> >  	struct regulator *reg_xceiver;
> > +	struct phy *transceiver;
> >  	struct clk *clk_ipg = NULL, *clk_per = NULL;
> >  	struct flexcan_regs __iomem *regs;
> >  	struct flexcan_platform_data *pdata;
> > @@ -2101,6 +2107,14 @@ static int flexcan_probe(struct platform_device *pdev)
> >  	else if (IS_ERR(reg_xceiver))
> >  		return PTR_ERR(reg_xceiver);
> >  
> > +	transceiver = devm_phy_optional_get(&pdev->dev, NULL);
> > +	if (PTR_ERR(transceiver) == -EPROBE_DEFER) {
> > +		return -EPROBE_DEFER;
> > +	} else if (IS_ERR(transceiver)) {
> > +		dev_err(&pdev->dev, "failed to get phy\n");
> > +		return PTR_ERR(transceiver);
> > +	}
> 
> Please use dev_err_probe(), it will be silent in case of EPROBE_DEFER.

Will fix it.

Best regards,
Dimitri Fedrau