linux-kernel - Re: [PATCH v2 6/8] phy: amlogic: Add Amlogic G12A USB3 + PCIE Combo PHY Driver

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Message-ID: <CAFBinCBnDPcHpOQ1vW1gL6FxgLSxMv-f-qMm_TTCvXfDaFr3zA@mail.gmail.com>
Date:   Wed, 6 Mar 2019 22:04:33 +0100
From:   Martin Blumenstingl <martin.blumenstingl@...glemail.com>
To:     Neil Armstrong <narmstrong@...libre.com>
Cc:     gregkh@...uxfoundation.org, hminas@...opsys.com, balbi@...nel.org,
        kishon@...com, linux-amlogic@...ts.infradead.org,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 6/8] phy: amlogic: Add Amlogic G12A USB3 + PCIE Combo
 PHY Driver

Hi Neil,

On Mon, Mar 4, 2019 at 11:40 AM Neil Armstrong <narmstrong@...libre.com> wrote:
[...]
> +static int phy_g12a_usb3_init(struct phy *phy)
> +{
> +       struct phy_g12a_usb3_pcie_priv *priv = phy_get_drvdata(phy);
> +       int data, ret;
> +
> +       /* Switch PHY to USB3 */
> +       regmap_update_bits(priv->regmap, PHY_R0,
> +                          PHY_R0_PCIE_USB3_SWITCH,
> +                          PHY_R0_PCIE_USB3_SWITCH);
does this automatically clear PHY_R0_PCIE_POWER_STATE (in case the
bootloader incorrectly set that)?

[...]
> +static int phy_g12a_usb3_pcie_init(struct phy *phy)
> +{
> +       struct phy_g12a_usb3_pcie_priv *priv = phy_get_drvdata(phy);
> +       int ret;
> +
> +       ret = reset_control_reset(priv->reset);
> +       if (ret)
> +               return ret;
> +
> +       if (priv->mode == PHY_TYPE_USB3)
> +               return phy_g12a_usb3_init(phy);
> +
> +       /* Power UP PCIE */
> +       regmap_update_bits(priv->regmap, PHY_R0,
> +                          PHY_R0_PCIE_POWER_STATE,
> +                          FIELD_PREP(PHY_R0_PCIE_POWER_STATE, 0x1c));
similar to my question above: does this automatically clear
PHY_R0_PCIE_USB3_SWITCH (in case the bootloader incorrectly set that)?

Apart from these two questions this looks good to me!


Regards
Martin