netdev - Re: [PATCH v2 4/7] can: m_can: Support pinctrl wakeup state

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Message-ID: <8dc30044f36a451766d2332f2869dce9d5e6f333.camel@geanix.com>
Date: Mon, 29 Jul 2024 10:51:23 +0200
From: Martin Hundebøll <martin@...nix.com>
To: Markus Schneider-Pargmann <msp@...libre.com>, Chandrasekar Ramakrishnan
 <rcsekar@...sung.com>, Marc Kleine-Budde <mkl@...gutronix.de>, Vincent
 Mailhol <mailhol.vincent@...adoo.fr>, "David S . Miller"
 <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski
 <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,  Rob Herring
 <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>,  Nishanth Menon <nm@...com>, Vignesh Raghavendra
 <vigneshr@...com>, Tero Kristo <kristo@...nel.org>, Christophe JAILLET
 <christophe.jaillet@...adoo.fr>,  Michal Kubiak <michal.kubiak@...el.com>
Cc: Vibhore Vardhan <vibhore@...com>, Kevin Hilman <khilman@...libre.com>, 
 Dhruva Gole <d-gole@...com>, Conor Dooley <conor@...nel.org>,
 linux-can@...r.kernel.org,  netdev@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 4/7] can: m_can: Support pinctrl wakeup state

Hi Markus,

On Mon, 2024-07-29 at 09:41 +0200, Markus Schneider-Pargmann wrote:
> am62 requires a wakeup flag being set in pinctrl when mcan pins acts
> as
> a wakeup source. Add support to select the wakeup state if WOL is
> enabled.
> 
> Signed-off-by: Markus Schneider-Pargmann <msp@...libre.com>
> ---
>  drivers/net/can/m_can/m_can.c | 57
> +++++++++++++++++++++++++++++++++++
>  drivers/net/can/m_can/m_can.h |  4 +++
>  2 files changed, 61 insertions(+)
> 
> diff --git a/drivers/net/can/m_can/m_can.c
> b/drivers/net/can/m_can/m_can.c
> index 5b80a7d1f9a1..b71e7f8e9727 100644
> --- a/drivers/net/can/m_can/m_can.c
> +++ b/drivers/net/can/m_can/m_can.c
> @@ -2193,6 +2193,7 @@ static void m_can_get_wol(struct net_device
> *dev, struct ethtool_wolinfo *wol)
>  static int m_can_set_wol(struct net_device *dev, struct
> ethtool_wolinfo *wol)
>  {
>  	struct m_can_classdev *cdev = netdev_priv(dev);
> +	struct pinctrl_state *new_pinctrl_state = NULL;
>  	bool wol_enable = !!wol->wolopts & WAKE_PHY;
>  	int ret;
>  
> @@ -2209,7 +2210,27 @@ static int m_can_set_wol(struct net_device
> *dev, struct ethtool_wolinfo *wol)
>  		return ret;
>  	}
>  
> +	if (wol_enable)
> +		new_pinctrl_state = cdev->pinctrl_state_wakeup;
> +	else
> +		new_pinctrl_state = cdev->pinctrl_state_default;
> +
> +	if (!IS_ERR_OR_NULL(new_pinctrl_state)) {

Why not do

	if (IS_ERR_OR_NULL(new_pinctrl_state))
		return 0;

?

// Martin

> +		ret = pinctrl_select_state(cdev->pinctrl,
> new_pinctrl_state);
> +		if (ret) {
> +			netdev_err(cdev->net, "Failed to select
> pinctrl state %pE\n",
> +				   ERR_PTR(ret));
> +			goto err_wakeup_enable;
> +		}
> +	}
> +
>  	return 0;
> +
> +err_wakeup_enable:
> +	/* Revert wakeup enable */
> +	device_set_wakeup_enable(cdev->dev, !wol_enable);
> +
> +	return ret;
>  }
>  
>  static const struct ethtool_ops m_can_ethtool_ops_coalescing = {
> @@ -2377,7 +2398,43 @@ struct m_can_classdev
> *m_can_class_allocate_dev(struct device *dev,
>  
>  	m_can_of_parse_mram(class_dev, mram_config_vals);
>  
> +	class_dev->pinctrl = devm_pinctrl_get(dev);
> +	if (IS_ERR(class_dev->pinctrl)) {
> +		ret = PTR_ERR(class_dev->pinctrl);
> +
> +		if (ret != -ENODEV) {
> +			dev_err_probe(dev, ret, "Failed to get
> pinctrl\n");
> +			goto err_free_candev;
> +		}
> +
> +		class_dev->pinctrl = NULL;
> +	} else {
> +		class_dev->pinctrl_state_wakeup =
> pinctrl_lookup_state(class_dev->pinctrl, "wakeup");
> +		if (IS_ERR(class_dev->pinctrl_state_wakeup)) {
> +			ret = PTR_ERR(class_dev-
> >pinctrl_state_wakeup);
> +			ret = -EIO;
> +
> +			if (ret != -ENODEV) {
> +				dev_err_probe(dev, ret, "Failed to
> lookup pinctrl wakeup state\n");
> +				goto err_free_candev;
> +			}
> +
> +			class_dev->pinctrl_state_wakeup = NULL;
> +		} else {
> +			class_dev->pinctrl_state_default =
> pinctrl_lookup_state(class_dev->pinctrl, "default");
> +			if (IS_ERR(class_dev-
> >pinctrl_state_default)) {
> +				ret = PTR_ERR(class_dev-
> >pinctrl_state_default);
> +				dev_err_probe(dev, ret, "Failed to
> lookup pinctrl default state\n");
> +				goto err_free_candev;
> +			}
> +		}
> +	}
> +
>  	return class_dev;
> +
> +err_free_candev:
> +	free_candev(net_dev);
> +	return ERR_PTR(ret);
>  }
>  EXPORT_SYMBOL_GPL(m_can_class_allocate_dev);
>  
> diff --git a/drivers/net/can/m_can/m_can.h
> b/drivers/net/can/m_can/m_can.h
> index 92b2bd8628e6..b75b0dd6ccc9 100644
> --- a/drivers/net/can/m_can/m_can.h
> +++ b/drivers/net/can/m_can/m_can.h
> @@ -126,6 +126,10 @@ struct m_can_classdev {
>  	struct mram_cfg mcfg[MRAM_CFG_NUM];
>  
>  	struct hrtimer hrtimer;
> +
> +	struct pinctrl *pinctrl;
> +	struct pinctrl_state *pinctrl_state_default;
> +	struct pinctrl_state *pinctrl_state_wakeup;
>  };
>  
>  struct m_can_classdev *m_can_class_allocate_dev(struct device *dev,
> int sizeof_priv);