linux-kernel - Re: [PATCH net-next v4 2/2] net: dsa: microchip: Add drive strength configuration

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Message-ID: <20230912064711.GE780075@pengutronix.de>
Date:   Tue, 12 Sep 2023 08:47:11 +0200
From:   Oleksij Rempel <o.rempel@...gutronix.de>
To:     Christophe JAILLET <christophe.jaillet@...adoo.fr>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Andrew Lunn <andrew@...n.ch>,
        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>, devicetree@...r.kernel.org,
        netdev@...r.kernel.org,
        "Russell King (Oracle)" <linux@...linux.org.uk>,
        linux-kernel@...r.kernel.org, kernel@...gutronix.de,
        UNGLinuxDriver@...rochip.com
Subject: Re: [PATCH net-next v4 2/2] net: dsa: microchip: Add drive strength
 configuration

On Tue, Sep 12, 2023 at 07:22:21AM +0200, Christophe JAILLET wrote:
...
> > +static void ksz_drive_strength_error(struct ksz_device *dev,
> > +				     const struct ksz_drive_strength *array,
> > +				     size_t array_size, int milliamp)
> > +{
> > +	char supported_values[100];
> > +	size_t remaining_size;
> > +	int added_len;
> > +	char *ptr;
> > +	int i;
> > +
> > +	remaining_size = sizeof(supported_values);
> > +	ptr = supported_values;
> > +
> > +	for (i = 0; i < array_size; i++) {
> > +		added_len = snprintf(ptr, remaining_size,
> > +				     i == 0 ? "%d" : ", %d", array[i].milliamp);
> > +
> > +		if (added_len < 0 || added_len >= remaining_size)
> 
> Nit: snprintf() does not return negatives value.

thx! will fix it

...
> > +static int ksz_parse_drive_strength(struct ksz_device *dev)
> > +{
> > +	struct ksz_driver_strength_prop of_props[] = {
> > +		[KSZ_DRIVER_STRENGTH_HI] = {
> > +			.name = "microchip,hi-drive-strength-microamp",
> > +			.offset = SW_HI_SPEED_DRIVE_STRENGTH_S,
> > +			.value = -1
> > +		},
> > +		[KSZ_DRIVER_STRENGTH_LO] = {
> > +			.name = "microchip,lo-drive-strength-microamp",
> > +			.offset = SW_LO_SPEED_DRIVE_STRENGTH_S,
> > +			.value = -1
> > +		},
> > +		[KSZ_DRIVER_STRENGTH_IO] = {
> > +			.name = "microchip,io-drive-strength-microamp",
> > +			.offset = 0, /* don't care */
> > +			.value = -1
> > +		},
> > +	};
> > +	struct device_node *np = dev->dev->of_node;
> > +	bool found = false;
> > +	int i, ret;
> > +
> > +	for (i = 0; i < ARRAY_SIZE(of_props); i++) {
> > +		ret = of_property_read_u32(np, of_props[i].name,
> > +					   &of_props[i].value);
> > +		if (ret && ret != -EINVAL)
> > +			dev_warn(dev->dev, "Failed to read %s\n",
> > +				 of_props[i].name);
> > +		if (ret)
> > +			continue;
> > +
> > +		found = true;
> 
> Nit: break?

No, we may have more then one property.

Regards,
Oleksij
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