linux-kernel - Re: [RESEND PATCH] mfd: sc27xx: Add USB charger type detection support

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Message-ID: <20200224113926.GU3494@dell>
Date:   Mon, 24 Feb 2020 11:39:26 +0000
From:   Lee Jones <lee.jones@...aro.org>
To:     Baolin Wang <baolin.wang7@...il.com>
Cc:     arnd@...db.de, zhang.lyra@...il.com, orsonzhai@...il.com,
        linux-kernel@...r.kernel.org
Subject: Re: [RESEND PATCH] mfd: sc27xx: Add USB charger type detection
 support

On Mon, 17 Feb 2020, Baolin Wang wrote:

> The Spreadtrum SC27XX series PMICs supply the USB charger type detection
> function, and related registers are located on the PMIC global registers
> region, thus we implement and export this function in the MFD driver for
> users to get the USB charger type.
> 
> Signed-off-by: Baolin Wang <baolin.wang7@...il.com>
> ---
>  drivers/mfd/sprd-sc27xx-spi.c   |   52 +++++++++++++++++++++++++++++++++++++++
>  include/linux/mfd/sc27xx-pmic.h |    7 ++++++
>  2 files changed, 59 insertions(+)
>  create mode 100644 include/linux/mfd/sc27xx-pmic.h

[...]

> +enum usb_charger_type sprd_pmic_detect_charger_type(struct device *dev)
> +{
> +	struct spi_device *spi = to_spi_device(dev);
> +	struct sprd_pmic *ddata = spi_get_drvdata(spi);
> +	const struct sprd_pmic_data *pdata = ddata->pdata;
> +	enum usb_charger_type type;
> +	u32 val;
> +	int ret;
> +
> +	ret = regmap_read_poll_timeout(ddata->regmap, pdata->charger_det, val,
> +				       (val & SPRD_PMIC_CHG_DET_DONE),
> +				       SPRD_PMIC_CHG_DET_DELAY_US,
> +				       SPRD_PMIC_CHG_DET_TIMEOUT);
> +	if (ret) {
> +		dev_err(&spi->dev, "failed to detect charger type\n");
> +		return UNKNOWN_TYPE;
> +	}
> +
> +	switch (val & SPRD_PMIC_CHG_TYPE_MASK) {
> +	case SPRD_PMIC_CDP_TYPE:
> +		type = CDP_TYPE;
> +		break;
> +	case SPRD_PMIC_DCP_TYPE:
> +		type = DCP_TYPE;
> +		break;
> +	case SPRD_PMIC_SDP_TYPE:
> +		type = SDP_TYPE;
> +		break;
> +	default:
> +		type = UNKNOWN_TYPE;
> +		break;
> +	}
> +
> +	return type;
> +}
> +EXPORT_SYMBOL_GPL(sprd_pmic_detect_charger_type);

Where is this called from?

Why isn't the charger type detected in the charger driver?

-- 
Lee Jones [李琼斯]
Linaro Services Technical Lead
Linaro.org │ Open source software for ARM SoCs
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