linux-kernel - Re: [PATCH 2/3] regulator: qcom_usb_vbus: Add support for PMI8998 VBUS

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Message-ID: <kvdtyzkhnc7uzjzfdlngj3bko3cuuvmf6d7zbr7r27rlpkz7zk@247hx2uqhnvn>
Date: Wed, 12 Feb 2025 05:48:50 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: "James A. MacInnes" <james.a.macinnes@...il.com>
Cc: linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org, 
	devicetree@...r.kernel.org, andersson@...nel.org, konradybcio@...nel.org, 
	quic_wcheng@...cinc.com, robh@...nel.org, krzk+dt@...nel.org, conor+dt@...nel.org, 
	lgirdwood@...il.com, broonie@...nel.org
Subject: Re: [PATCH 2/3] regulator: qcom_usb_vbus: Add support for PMI8998
 VBUS

On Tue, Feb 11, 2025 at 05:07:43PM -0800, James A. MacInnes wrote:
> This patch extends the Qualcomm USB VBUS regulator driver to support
> PMI8998 PMIC alongside the existing support for PM8150B.

Please modify this commit message according to follow the example I
provided for the patch 3. If you are unsure `git log drivers/regulator`
will provide you with good enough examples.

> 
> Key changes:
> - Added current limit tables specific to PMI8998.
> - Dynamically configure the VBUS regulator based on the PMIC type.
> - Updated debug messages to reflect successful initialization for
>   supported PMICs.
> - Changed registration log message
> 
> These changes ensure proper VBUS current limit configuration and
> compatibility across multiple Qualcomm PMICs.
> 
> Signed-off-by: James A. MacInnes <james.a.macinnes@...il.com>
> ---
>  drivers/regulator/qcom_usb_vbus-regulator.c | 38 ++++++++++++++++++---
>  1 file changed, 33 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/regulator/qcom_usb_vbus-regulator.c b/drivers/regulator/qcom_usb_vbus-regulator.c
> index cd94ed67621f..804dd1a9e057 100644
> --- a/drivers/regulator/qcom_usb_vbus-regulator.c
> +++ b/drivers/regulator/qcom_usb_vbus-regulator.c
> @@ -20,10 +20,30 @@
>  #define OTG_CFG				0x53
>  #define OTG_EN_SRC_CFG			BIT(1)
>  
> -static const unsigned int curr_table[] = {
> +struct msm_vbus_desc {
> +	const unsigned int *curr_table;
> +	unsigned int n_current_limits;
> +};
> +
> +static const unsigned int curr_table_pm8150b[] = {
>  	500000, 1000000, 1500000, 2000000, 2500000, 3000000,
>  };
>  
> +static const unsigned int curr_table_pmi8998[] = {
> +	250000, 500000, 750000, 1000000,
> +	1250000, 1500000, 1750000, 2000000,
> +};
> +
> +static const struct msm_vbus_desc msm_vbus_desc_pm8150b = {
> +	.curr_table = curr_table_pm8150b,
> +	.n_current_limits = ARRAY_SIZE(curr_table_pm8150b),
> +};
> +
> +static const struct msm_vbus_desc msm_vbus_desc_pmi8998 = {
> +	.curr_table = curr_table_pmi8998,
> +	.n_current_limits = ARRAY_SIZE(curr_table_pmi8998),
> +};
> +
>  static const struct regulator_ops qcom_usb_vbus_reg_ops = {
>  	.enable = regulator_enable_regmap,
>  	.disable = regulator_disable_regmap,
> @@ -37,8 +57,6 @@ static struct regulator_desc qcom_usb_vbus_rdesc = {
>  	.ops = &qcom_usb_vbus_reg_ops,
>  	.owner = THIS_MODULE,
>  	.type = REGULATOR_VOLTAGE,
> -	.curr_table = curr_table,
> -	.n_current_limits = ARRAY_SIZE(curr_table),
>  };
>  
>  static int qcom_usb_vbus_regulator_probe(struct platform_device *pdev)
> @@ -48,6 +66,7 @@ static int qcom_usb_vbus_regulator_probe(struct platform_device *pdev)
>  	struct regmap *regmap;
>  	struct regulator_config config = { };
>  	struct regulator_init_data *init_data;
> +	const struct msm_vbus_desc *quirks;
>  	int ret;
>  	u32 base;
>  
> @@ -68,6 +87,12 @@ static int qcom_usb_vbus_regulator_probe(struct platform_device *pdev)
>  	if (!init_data)
>  		return -ENOMEM;
>  
> +	quirks = of_device_get_match_data(dev);
> +	if (!quirks)
> +		return -ENODEV;
> +
> +	qcom_usb_vbus_rdesc.curr_table = quirks->curr_table;
> +	qcom_usb_vbus_rdesc.n_current_limits = quirks->n_current_limits;
>  	qcom_usb_vbus_rdesc.enable_reg = base + CMD_OTG;
>  	qcom_usb_vbus_rdesc.enable_mask = OTG_EN;
>  	qcom_usb_vbus_rdesc.csel_reg = base + OTG_CURRENT_LIMIT_CFG;
> @@ -80,18 +105,21 @@ static int qcom_usb_vbus_regulator_probe(struct platform_device *pdev)
>  	rdev = devm_regulator_register(dev, &qcom_usb_vbus_rdesc, &config);
>  	if (IS_ERR(rdev)) {
>  		ret = PTR_ERR(rdev);
> -		dev_err(dev, "not able to register vbus reg %d\n", ret);
> +		dev_err(dev, "Failed to register vbus reg %d\n", ret);
>  		return ret;
>  	}
>  
>  	/* Disable HW logic for VBUS enable */
>  	regmap_update_bits(regmap, base + OTG_CFG, OTG_EN_SRC_CFG, 0);
>  
> +	dev_dbg(dev, "Registered QCOM VBUS regulator\n");
> +
>  	return 0;
>  }
>  
>  static const struct of_device_id qcom_usb_vbus_regulator_match[] = {
> -	{ .compatible = "qcom,pm8150b-vbus-reg" },
> +	{ .compatible = "qcom,pm8150b-vbus-reg", .data = &msm_vbus_desc_pm8150b },
> +	{ .compatible = "qcom,pmi8998-vbus-reg", .data = &msm_vbus_desc_pmi8998 },
>  	{ }
>  };
>  MODULE_DEVICE_TABLE(of, qcom_usb_vbus_regulator_match);
> -- 
> 2.43.0
> 

-- 
With best wishes
Dmitry