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

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Date: Thu, 21 Dec 2023 10:06:50 +0100
From: Andrew Lunn <andrew@...n.ch>
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,
	hkallweit1@...il.com, linux@...linux.org.uk, 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

> +static int
> +fwnode_regulator_get_bulk_enabled(struct device *dev,
> +				  struct fwnode_handle *fwnode,
> +				  struct regulator_bulk_data **consumers)
> +{
> +	struct device_node *np;
> +	int ret, reg_cnt;
> +
> +	np = to_of_node(fwnode);
> +	if (!np)
> +		return 0;
> +
> +	reg_cnt = of_regulator_bulk_get_all(dev, np, consumers);
> +	if (reg_cnt < 0) {
> +		ret = reg_cnt;
> +		goto clean_consumers;
> +	}
> +
> +	if (reg_cnt == 0)
> +		return 0;

I've not used regulators much, but i think you can combine these two
into one. Its guaranteed *consumer is NULL if reg_cnt == 0. And
kfree() is happy with a NULL pointer.

> +
> +	ret = regulator_bulk_enable(reg_cnt, *consumers);
> +	if (ret)
> +		goto clean_consumers;

I would expect this to be part of mdio_device_reset(), same as the
GPIO, and reset controller, but first obviously. And parsing DT should
happen in a similar place to parsing the reset GPIO and reset
controller.

	Andrew