Re: [PATCH v2 net-next 3/4] net: phy: Add Qualcomm QCA807x driver

Andrew Lunn
2021-02-11T00:21:32Z

> +static int qca807x_psgmii_config(struct phy_device *phydev)
> +{
> + struct device_node *node = phydev->mdio.dev.of_node;
> + int psgmii_az, tx_amp, ret = 0;
> + u32 tx_driver_strength_dt;
> +
> + /* Workaround to enable AZ transmitting ability */
> + if (of_property_read_bool(node, "qcom,psgmii-az")) {
> + psgmii_az = phy_read_mmd(phydev, MDIO_MMD_PMAPMD, PSGMII_MODE_CTRL);
> + psgmii_az &= ~PSGMII_MODE_CTRL_AZ_WORKAROUND_MASK;
> + psgmii_az |= FIELD_PREP(PSGMII_MODE_CTRL_AZ_WORKAROUND_MASK, 0xc);
> + ret = phy_write_mmd(phydev, MDIO_MMD_PMAPMD, PSGMII_MODE_CTRL, psgmii_az);
> + psgmii_az = phy_read_mmd(phydev, MDIO_MMD_PMAPMD, PSGMII_MODE_CTRL);
> + }
> +
> + /* PSGMII/QSGMII TX amp set to DT defined value instead of default 600mV */
> + if (!of_property_read_u32(node, "qcom,tx-driver-strength", &tx_driver_strength_dt)) {
> + int tx_driver_strength;
> +
> + switch (tx_driver_strength_dt) {
> + case 140:
> + tx_driver_strength = 0;
> + break;
> + case 160:
> + tx_driver_strength = 1;
> + break;
> + case 180:
> + tx_driver_strength = 2;
> + break;
> + case 200:
> + tx_driver_strength = 3;
> + break;
> + case 220:
> + tx_driver_strength = 4;
> + break;
> + case 240:
> + tx_driver_strength = 5;
> + break;
> + case 260:
> + tx_driver_strength = 6;
> + break;
> + case 280:
> + tx_driver_strength = 7;
> + break;
> + case 300:
> + tx_driver_strength = 8;
> + break;
> + case 320:
> + tx_driver_strength = 9;
> + break;
> + case 400:
> + tx_driver_strength = 10;
> + break;
> + case 500:
> + tx_driver_strength = 11;
> + break;
> + case 600:
> + tx_driver_strength = 12;
> + break;
> + default:
> + tx_driver_strength = 12;
> + break;

Please return -EINVAL here. The value in DT is not valid, so you
should error out. If there is no value at all, then it is O.K. to
default to 12.

Andrew