linux-kernel - Re: [PATCH v5 1/3] phy: handle optional regulator for PHY

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Date: Tue, 2 Jan 2024 11:30:51 +0000
From: "Russell King (Oracle)" <linux@...linux.org.uk>
To: Jernej Skrabec <jernej.skrabec@...il.com>
Cc: robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
	conor+dt@...nel.org, wens@...e.org, samuel@...lland.org,
	andrew@...n.ch, hkallweit1@...il.com, davem@...emloft.net,
	edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
	devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-sunxi@...ts.linux.dev, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org, Corentin Labbe <clabbe.montjoie@...il.com>
Subject: Re: [PATCH v5 1/3] phy: handle optional regulator for PHY

On Wed, Dec 20, 2023 at 09:35:35PM +0100, Jernej Skrabec wrote:
> From: Corentin Labbe <clabbe.montjoie@...il.com>
> 
> Add handling of optional regulators for PHY.
> 
> Regulators need to be enabled before PHY scanning, so MDIO bus
> initiate this task.
> 
> Signed-off-by: Corentin Labbe <clabbe.montjoie@...il.com>
> Signed-off-by: Jernej Skrabec <jernej.skrabec@...il.com>
> ---
>  drivers/net/mdio/fwnode_mdio.c | 53 ++++++++++++++++++++++++++++++++--
>  drivers/net/phy/phy_device.c   |  6 ++++
>  include/linux/phy.h            |  3 ++
>  3 files changed, 60 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/mdio/fwnode_mdio.c b/drivers/net/mdio/fwnode_mdio.c
> index fd02f5cbc853..bd5a27eaf40c 100644
> --- a/drivers/net/mdio/fwnode_mdio.c
> +++ b/drivers/net/mdio/fwnode_mdio.c
> @@ -11,6 +11,7 @@
>  #include <linux/of.h>
>  #include <linux/phy.h>
>  #include <linux/pse-pd/pse.h>
> +#include <linux/regulator/consumer.h>
>  
>  MODULE_AUTHOR("Calvin Johnson <calvin.johnson@....nxp.com>");
>  MODULE_LICENSE("GPL");
> @@ -58,6 +59,40 @@ fwnode_find_mii_timestamper(struct fwnode_handle *fwnode)
>  	return register_mii_timestamper(arg.np, arg.args[0]);
>  }
>  
> +static int
> +fwnode_regulator_get_bulk_enabled(struct device *dev,
> +				  struct fwnode_handle *fwnode,
> +				  struct regulator_bulk_data **consumers)

This seems to be a bad name for something living in fwnode_mdio.c - it
looks like something the regulator core should be providing.

> +clean_regulators:
> +	if (reg_cnt > 0)
> +		regulator_bulk_disable(reg_cnt, consumers);
> +	kfree(consumers);

and there really should be a function that undoes the effects of
fwnode_regulator_get_bulk_enabled() rather than having it open-coded,
especially as:

> @@ -3400,6 +3401,11 @@ static int phy_remove(struct device *dev)
>  
>  	phydev->drv = NULL;
>  
> +	if (phydev->regulator_cnt > 0)
> +		regulator_bulk_disable(phydev->regulator_cnt, phydev->consumers);
> +
> +	kfree(phydev->consumers);
> +

it also appears here.

-- 
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