linux-kernel - Re: [PATCH v9 2/4] phy: qcom-qmp-usb: add support for updated qcm2290 / sm6115 binding

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Message-ID: <1be5930d-a389-7fa0-2886-4e9af09cbf85@linaro.org>
Date:   Tue, 2 May 2023 03:13:30 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Bhupesh Sharma <bhupesh.sharma@...aro.org>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-phy@...ts.infradead.org
Cc:     agross@...nel.org, linux-kernel@...r.kernel.org,
        andersson@...nel.org, bhupesh.linux@...il.com,
        krzysztof.kozlowski@...aro.org, robh+dt@...nel.org,
        konrad.dybcio@...aro.org, kishon@...nel.org, vkoul@...nel.org,
        krzysztof.kozlowski+dt@...aro.org
Subject: Re: [PATCH v9 2/4] phy: qcom-qmp-usb: add support for updated qcm2290
 / sm6115 binding

On 01/05/2023 22:24, Bhupesh Sharma wrote:
> Add support for the new qcm2290 / sm6115 binding.
> 
> The USB QMP phy on these devices supports 2 lanes. Also note that the
> binding now does not describe every register subregion and instead
> the driver holds the corresponding offsets. This also includes
> the PCS_MISC region.
> 
> Signed-off-by: Bhupesh Sharma <bhupesh.sharma@...aro.org>
> ---
>   drivers/phy/qualcomm/phy-qcom-qmp-usb.c | 22 ++++++++++++++++++++++
>   1 file changed, 22 insertions(+)
> 
> diff --git a/drivers/phy/qualcomm/phy-qcom-qmp-usb.c b/drivers/phy/qualcomm/phy-qcom-qmp-usb.c
> index a49711c5a63d..aa143c081805 100644
> --- a/drivers/phy/qualcomm/phy-qcom-qmp-usb.c
> +++ b/drivers/phy/qualcomm/phy-qcom-qmp-usb.c
> @@ -1414,6 +1414,10 @@ struct qmp_usb_offsets {
>   	u16 pcs_usb;
>   	u16 tx;
>   	u16 rx;
> +	/* for PHYs with >= 2 lanes */
> +	u16 tx2;
> +	u16 rx2;
> +	u16 pcs_misc;
>   };
>   
>   /* struct qmp_phy_cfg - per-PHY initialization config */
> @@ -1558,6 +1562,16 @@ static const char * const qmp_phy_vreg_l[] = {
>   	"vdda-phy", "vdda-pll",
>   };
>   
> +static const struct qmp_usb_offsets qmp_usb_offsets_v3 = {
> +	.serdes		= 0,
> +	.pcs		= 0xc00,
> +	.tx		= 0x200,
> +	.rx		= 0x400,
> +	.tx2		= 0x600,
> +	.rx2		= 0x800,
> +	.pcs_misc	= 0xa00,
> +};
> +
>   static const struct qmp_usb_offsets qmp_usb_offsets_v5 = {
>   	.serdes		= 0,
>   	.pcs		= 0x0200,
> @@ -1922,6 +1936,8 @@ static const struct qmp_phy_cfg sm8350_usb3_uniphy_cfg = {
>   static const struct qmp_phy_cfg qcm2290_usb3phy_cfg = {
>   	.lanes			= 2,
>   
> +	.offsets		= &qmp_usb_offsets_v3,
> +
>   	.serdes_tbl		= qcm2290_usb3_serdes_tbl,
>   	.serdes_tbl_num		= ARRAY_SIZE(qcm2290_usb3_serdes_tbl),
>   	.tx_tbl			= qcm2290_usb3_tx_tbl,
> @@ -2497,6 +2513,12 @@ static int qmp_usb_parse_dt(struct qmp_usb *qmp)
>   	qmp->tx = base + offs->tx;
>   	qmp->rx = base + offs->rx;
>   
> +	if (cfg->lanes >= 2) {
> +		qmp->tx2 = base + offs->tx2;
> +		qmp->rx2 = base + offs->rx2;
> +		qmp->pcs_misc = base + offs->pcs_misc;

pcs_misc should also be usable for a single-lane PHYs.

> +	}
> +
>   	qmp->pipe_clk = devm_clk_get(dev, "pipe");
>   	if (IS_ERR(qmp->pipe_clk)) {
>   		return dev_err_probe(dev, PTR_ERR(qmp->pipe_clk),

-- 
With best wishes
Dmitry