Re: [PATCH 4/4] phy: qcom: qmp-combo: Add USB3+DP PHY support for Nord

[Krishna Kurapati <krishna.kurapati@oss.qualcomm.com>]

On 9/1/2026 3:20 PM, Shawn Guo wrote:
> From: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>
> 
> Nord SoC provides two USB3+DP combo PHYs. Their initialisation sequences
> are identical to sm8550, but the sub-blocks are not laid out the same way:
> Nord adds a dedicated USB3_PCS_AON region at offset 0x1e00 and leaves
> everything else where sm8550 has it. None of the existing offsets tables
> describe that, so add a v6 table which is the v3 layout plus usb3_pcs_aon.
> 
> Populating usb3_pcs_aon changes where the driver drives the I/O clamp when
> entering and leaving autonomous mode: it now uses the real AON region
> rather than falling back to PCS_MISC, which is what platforms with no AON
> region do.
> 
> The offsets were confirmed against the Nord register map for both PHY
> instances, USB3_DP_PHY_0 at 0x088e1000 and USB3_DP_PHY_1 at 0x088e4000.
> USB3_PCS_AON_CLAMP_ENABLE sits at offset 0x00 of the AON region with a
> single CLAMP_EN_B bit, matching QPHY_V6_PCS_AON_CLAMP_ENABLE and CLAMP_EN.
> 
> Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>
> Assisted-by: LLM
> Signed-off-by: Shawn Guo <shengchao.guo@oss.qualcomm.com>
> ---
>   drivers/phy/qualcomm/phy-qcom-qmp-combo.c | 66 +++++++++++++++++++++++
>   1 file changed, 66 insertions(+)
> 
> diff --git a/drivers/phy/qualcomm/phy-qcom-qmp-combo.c b/drivers/phy/qualcomm/phy-qcom-qmp-combo.c
> index c39ced168d03..de82c7107c92 100644
> --- a/drivers/phy/qualcomm/phy-qcom-qmp-combo.c
> +++ b/drivers/phy/qualcomm/phy-qcom-qmp-combo.c
> @@ -2690,6 +2690,23 @@ static const struct qmp_combo_offsets qmp_combo_offsets_v5 = {
>   	.dp_dp_phy	= 0x2200,
>   };
>   
> +static const struct qmp_combo_offsets qmp_combo_offsets_v6 = {
> +	.com		= 0x0000,
> +	.txa		= 0x1200,
> +	.rxa		= 0x1400,
> +	.txb		= 0x1600,
> +	.rxb		= 0x1800,
> +	.usb3_serdes	= 0x1000,
> +	.usb3_pcs_misc	= 0x1a00,
> +	.usb3_pcs	= 0x1c00,
> +	.usb3_pcs_aon	= 0x1e00,
> +	.usb3_pcs_usb	= 0x1f00,
> +	.dp_serdes	= 0x2000,
> +	.dp_txa		= 0x2200,
> +	.dp_txb		= 0x2600,
> +	.dp_dp_phy	= 0x2a00,
> +};
> +
>   static const struct qmp_combo_offsets qmp_combo_offsets_v8 = {
>   	.com		= 0x0000,
>   	.txa		= 0x1400,
> @@ -3394,6 +3411,51 @@ static const struct qmp_phy_cfg glymur_usb3dpphy_cfg = {
>   	.num_vregs		= ARRAY_SIZE(qmp_phy_vreg_refgen),
>   };
>   
> +static const struct qmp_phy_cfg nord_usb3dpphy_cfg = {
> +	.offsets		= &qmp_combo_offsets_v6,
> +
> +	.serdes_tbl		= sm8550_usb3_serdes_tbl,
> +	.serdes_tbl_num		= ARRAY_SIZE(sm8550_usb3_serdes_tbl),
> +	.tx_tbl			= sm8550_usb3_tx_tbl,
> +	.tx_tbl_num		= ARRAY_SIZE(sm8550_usb3_tx_tbl),

The values are different for the following registers:

       USB3_QSERDES_TXA_RCV_DETECT_LVL_2: SM8550=0x12, Nord=0x14
       USB3_QSERDES_TXB_RCV_DETECT_LVL_2: SM8550=0x12, Nord=0x14

We need to add new tx_tbl for Nord.

Regards,
Krishna,

-- 
linux-phy mailing list
linux-phy@lists.infradead.org
https://lists.infradead.org/mailman/listinfo/linux-phy