linux-kernel - Re: [PATCH v2 3/6] net: phy: DP83640: Add LED handling

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Date: Wed, 28 Feb 2024 16:04:19 +0100
From: Andrew Lunn <andrew@...n.ch>
To: Bastien Curutchet <bastien.curutchet@...tlin.com>
Cc: "David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Rob Herring <robh+dt@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>, Pavel Machek <pavel@....cz>,
	Lee Jones <lee@...nel.org>,
	Richard Cochran <richardcochran@...il.com>,
	Heiner Kallweit <hkallweit1@...il.com>,
	Russell King <linux@...linux.org.uk>, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org, devicetree@...r.kernel.org,
	linux-leds@...r.kernel.org,
	Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
	herve.codina@...tlin.com, maxime.chevallier@...tlin.com,
	christophercordahi@...ometrics.ca
Subject: Re: [PATCH v2 3/6] net: phy: DP83640: Add LED handling

> +static int dp83640_led_brightness_set(struct phy_device *phydev, u8 index,
> +				      enum led_brightness brightness)
> +{
> +	int val;
> +
> +	if (index > DP83640_SPDLED_IDX)
> +		return -EINVAL;
> +
> +	phy_write(phydev, PAGESEL, 0);
> +
> +	val = phy_read(phydev, LEDCR) & ~DP83640_LED_DIS(index);
> +	val |= DP83640_LED_DRV(index);
> +	if (brightness)
> +		val |= DP83640_LED_VAL(index);
> +	else
> +		val &= ~DP83640_LED_VAL(index);
> +	phy_write(phydev, LEDCR, val);

I don't understand this driver too well, but should this be using
ext_read() and ext_write().

I'm also woundering if it would be good to implement the .read_page
and .write_page members in phy_driver and then use phy_write_paged()
and phy_write_paged() and phy_modify_paged(), which should do better
locking.

	Andrew