netdev - Re: [net-next PATCH v3 3/3] net: phy: Add Airoha AN8855 Internal Switch Gigabit PHY

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Message-ID: <8e5fd144-2325-43ff-b2b8-92d7f5910392@lunn.ch>
Date: Wed, 6 Nov 2024 17:19:03 +0100
From: Andrew Lunn <andrew@...n.ch>
To: Christian Marangi <ansuelsmth@...il.com>
Cc: Florian Fainelli <f.fainelli@...il.com>,
	Vladimir Oltean <olteanv@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Heiner Kallweit <hkallweit1@...il.com>,
	Russell King <linux@...linux.org.uk>,
	Matthias Brugger <matthias.bgg@...il.com>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org, netdev@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	upstream@...oha.com
Subject: Re: [net-next PATCH v3 3/3] net: phy: Add Airoha AN8855 Internal
 Switch Gigabit PHY

> +static const u8 dsa_r50ohm_table[] = {
> +	127, 127, 127, 127, 127, 127, 127, 127, 127, 127,
> +	127, 127, 127, 127, 127, 127, 127, 126, 122, 117,
> +	112, 109, 104, 101,  97,  94,  90,  88,  84,  80,
> +	78,  74,  72,  68,  66,  64,  61,  58,  56,  53,
> +	51,  48,  47,  44,  42,  40,  38,  36,  34,  32,
> +	31,  28,  27,  24,  24,  22,  20,  18,  16,  16,
> +	14,  12,  11,   9
> +};
> +
> +static int en8855_get_r50ohm_val(struct device *dev, const char *calib_name,
> +				 u8 *dest)
> +{
> +	u32 shift_sel, val;
> +	int ret;
> +	int i;
> +
> +	ret = nvmem_cell_read_u32(dev, calib_name, &val);
> +	if (ret)
> +		return ret;
> +
> +	shift_sel = FIELD_GET(AN8855_SWITCH_EFUSE_R50O, val);
> +	for (i = 0; i < ARRAY_SIZE(dsa_r50ohm_table); i++)
> +		if (dsa_r50ohm_table[i] == shift_sel)
> +			break;

Is an exact match expected? Should this be >= so the nearest match is
found?

> +
> +	if (i < 8 || i >= ARRAY_SIZE(dsa_r50ohm_table))
> +		*dest = dsa_r50ohm_table[25];
> +	else
> +		*dest = dsa_r50ohm_table[i - 8];
> +
> +	return 0;
> +}
> +
> +static int an8855_probe(struct phy_device *phydev)
> +{
> +	struct device *dev = &phydev->mdio.dev;
> +	struct device_node *node = dev->of_node;
> +	struct air_an8855_priv *priv;
> +	int ret;
> +
> +	/* If we don't have a node, skip get calib */
> +	if (!node)
> +		return 0;

phydev->priv will be a NULL pointer, causing problems in
an8855_config_init()

	Andrew