linux-kernel - Re: [PATCH v3 1/5] phy: qcom-qusb2: Add QUSB2 PHY support for SC7180

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Date:   Fri, 17 Jan 2020 12:30:00 -0800
From:   Matthias Kaehlcke <mka@...omium.org>
To:     Sandeep Maheswaram <sanm@...eaurora.org>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Kishon Vijay Abraham I <kishon@...com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Stephen Boyd <swboyd@...omium.org>,
        Doug Anderson <dianders@...omium.org>,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, Manu Gautam <mgautam@...eaurora.org>
Subject: Re: [PATCH v3 1/5] phy: qcom-qusb2: Add QUSB2 PHY support for SC7180

Hi,

On Fri, Jan 10, 2020 at 05:48:15PM +0530, Sandeep Maheswaram wrote:
> Using generic cfg table for QUSB2 V2 PHY.
> Add QUSB2 PHY config data and compatible for SC7180.
> 
> Signed-off-by: Sandeep Maheswaram <sanm@...eaurora.org>
> ---
>  drivers/phy/qualcomm/phy-qcom-qusb2.c | 22 ++++++++++++++--------
>  1 file changed, 14 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/phy/qualcomm/phy-qcom-qusb2.c b/drivers/phy/qualcomm/phy-qcom-qusb2.c
> index bf94a52..db4ae26 100644
> --- a/drivers/phy/qualcomm/phy-qcom-qusb2.c
> +++ b/drivers/phy/qualcomm/phy-qcom-qusb2.c
> @@ -1,6 +1,6 @@
>  // SPDX-License-Identifier: GPL-2.0
>  /*
> - * Copyright (c) 2017, The Linux Foundation. All rights reserved.
> + * Copyright (c) 2017, 2019, The Linux Foundation. All rights reserved.
>   */
>  
>  #include <linux/clk.h>
> @@ -177,7 +177,7 @@ static const struct qusb2_phy_init_tbl msm8998_init_tbl[] = {
>  	QUSB2_PHY_INIT_CFG(QUSB2PHY_PLL_DIGITAL_TIMERS_TWO, 0x19),
>  };
>  
> -static const unsigned int sdm845_regs_layout[] = {
> +static const unsigned int qusb2_v2_regs_layout[] = {
>  	[QUSB2PHY_PLL_CORE_INPUT_OVERRIDE] = 0xa8,
>  	[QUSB2PHY_PLL_STATUS]		= 0x1a0,
>  	[QUSB2PHY_PORT_TUNE1]		= 0x240,
> @@ -191,7 +191,7 @@ static const unsigned int sdm845_regs_layout[] = {
>  	[QUSB2PHY_INTR_CTRL]		= 0x230,
>  };
>  
> -static const struct qusb2_phy_init_tbl sdm845_init_tbl[] = {
> +static const struct qusb2_phy_init_tbl qusb2_v2_init_tbl[] = {
>  	QUSB2_PHY_INIT_CFG(QUSB2PHY_PLL_ANALOG_CONTROLS_TWO, 0x03),
>  	QUSB2_PHY_INIT_CFG(QUSB2PHY_PLL_CLOCK_INVERTERS, 0x7c),
>  	QUSB2_PHY_INIT_CFG(QUSB2PHY_PLL_CMODE, 0x80),
> @@ -258,10 +258,10 @@ static const struct qusb2_phy_cfg msm8998_phy_cfg = {
>  	.update_tune1_with_efuse = true,
>  };
>  
> -static const struct qusb2_phy_cfg sdm845_phy_cfg = {
> -	.tbl		= sdm845_init_tbl,
> -	.tbl_num	= ARRAY_SIZE(sdm845_init_tbl),
> -	.regs		= sdm845_regs_layout,
> +static const struct qusb2_phy_cfg qusb2_v2_phy_cfg = {
> +	.tbl		= qusb2_v2_init_tbl,
> +	.tbl_num	= ARRAY_SIZE(qusb2_v2_init_tbl),
> +	.regs		= qusb2_v2_regs_layout,
>  
>  	.disable_ctrl	= (PWR_CTRL1_VREF_SUPPLY_TRIM | PWR_CTRL1_CLAMP_N_EN |
>  			   POWER_DOWN),
> @@ -774,8 +774,14 @@ static const struct of_device_id qusb2_phy_of_match_table[] = {
>  		.compatible	= "qcom,msm8998-qusb2-phy",
>  		.data		= &msm8998_phy_cfg,
>  	}, {
> +		.compatible	= "qcom,sc7180-qusb2-phy",
> +		.data		= &qusb2_v2_phy_cfg,
> +	}, {

I don't think you need the new entry as of now, since sc7180 just uses the
standard v2 configuration. DT compatible entries should look like this:

	{
		compatible = "qcom,sc7180-qusb2-phy", "qcom,qusb2-v2-phy";
		...
	}

hence the correct configuration is selected, even without a specific entry
for 'qcom,sc7180-qusb2-phy'.


>  		.compatible	= "qcom,sdm845-qusb2-phy",
> -		.data		= &sdm845_phy_cfg,
> +		.data		= &qusb2_v2_phy_cfg,
> +	}, {

 think this can also be removed if you add 'qcom,qusb2-v2-phy' to the list
of compatible strings of nodes 'usb_1_hsphy' and 'usb_2_hsphy' in
arch/arm64/boot/dts/qcom/sdm845.dtsi.


> +		.compatible	= "qcom,qusb2-v2-phy",
> +		.data		= &qusb2_v2_phy_cfg,
>  	},
>  	{ },
>  };