linux-kernel - Re: [RFC net-next v1 2/2] net: dsa: microchip: ksz9477: Add drive strength configuration

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Message-ID: <0db96467-958e-4e5a-bd66-fc469316cfbb@lunn.ch>
Date:   Tue, 5 Sep 2023 14:54:05 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Oleksij Rempel <o.rempel@...gutronix.de>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Vladimir Oltean <olteanv@...il.com>,
        Woojung Huh <woojung.huh@...rochip.com>,
        Arun Ramadoss <arun.ramadoss@...rochip.com>,
        Conor Dooley <conor+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Rob Herring <robh+dt@...nel.org>, kernel@...gutronix.de,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        UNGLinuxDriver@...rochip.com,
        "Russell King (Oracle)" <linux@...linux.org.uk>,
        devicetree@...r.kernel.org
Subject: Re: [RFC net-next v1 2/2] net: dsa: microchip: ksz9477: Add drive
 strength configuration

> +static const struct ksz9477_drive_strength ksz9477_drive_strengths[] = {
> +	{ SW_DRIVE_STRENGTH_2MA,  2000 },
> +	{ SW_DRIVE_STRENGTH_4MA,  4000 },
> +	{ SW_DRIVE_STRENGTH_8MA,  8000 },
> +	{ SW_DRIVE_STRENGTH_12MA, 12000 },
> +	{ SW_DRIVE_STRENGTH_16MA, 16000 },
> +	{ SW_DRIVE_STRENGTH_20MA, 20000 },
> +	{ SW_DRIVE_STRENGTH_24MA, 24000 },
> +	{ SW_DRIVE_STRENGTH_28MA, 28000 },

These SW_DRIVE_STRENGTH_ values appear in both ksz8795_reg.h and
ksz9477_reg.h. Can the code be made common?

> +static u32 ksz9477_drive_strength_to_reg(u32 milliamp)
> +{
> +	size_t array_size = ARRAY_SIZE(ksz9477_drive_strengths);
> +	int i;
> +
> +	for (i = 0; i < array_size; i++) {
> +		if (ksz9477_drive_strengths[i].milliamp >= milliamp)
> +			return ksz9477_drive_strengths[i].reg_val;

Normally an exact match is used, not the nearest value.


    Andrew

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