linux-kernel - Re: [PATCH V2 1/2] usb: typec: Support sprd_pmic

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Message-ID: <2023121122-jelly-password-6eac@gregkh>
Date:   Mon, 11 Dec 2023 08:53:24 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Xinhu Wu <xinhu.wu@...soc.com>
Cc:     robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        conor+dt@...nel.org, orsonzhai@...il.com,
        baolin.wang@...ux.alibaba.com, zhang.lyra@...il.com,
        heikki.krogerus@...ux.intel.com, linux-usb@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        xinhuwu.unisoc@...il.com, zhiyong.liu@...soc.com,
        peak.yang@...soc.com, teng.zhang1@...soc.com,
        bruce.chen@...soc.com, surong.pang@...soc.com,
        xingxing.luo@...soc.com
Subject: Re: [PATCH V2 1/2] usb: typec: Support sprd_pmic_typec driver

On Mon, Dec 11, 2023 at 03:41:19PM +0800, Xinhu Wu wrote:
> +config TYPEC_SPRD_PMIC
> +	tristate "SPRD Serials PMICs Typec Controller"
> +	help
> +	  Say Y or M here if your system has a SPRD PMIC Type-C port controller.
> +
> +	  If you choose to build this driver as a dynamically linked module, the
> +	  module will be called sprd_pmic_typec.ko.
> +	  SPRD_PMIC_TYPEC notify usb, phy, charger, and analog audio to proceed
> +	  with work

I do not understand these last two lines, are you sure they are correct?

> +
> +

Nit, only one blank line is needed here.


> +static irqreturn_t sprd_pmic_typec_interrupt(int irq, void *data)
> +{
> +	struct sprd_pmic_typec *sc = data;
> +	u32 event;
> +	int ret;
> +
> +	dev_info(sc->dev, "%s enter line %d\n", __func__, __LINE__);

debugging information?  Please remove.

> +	ret = regmap_read(sc->regmap, sc->base + SC27XX_INT_MASK, &event);
> +	if (ret)
> +		return ret;
> +
> +	event &= sc->var_data->event_mask;
> +
> +	ret = regmap_read(sc->regmap, sc->base + SC27XX_STATUS, &sc->state);
> +	if (ret)
> +		goto clear_ints;
> +
> +	sc->state &= sc->var_data->state_mask;
> +
> +	if (event & SC27XX_ATTACH_INT) {
> +		ret = sprd_pmic_typec_connect(sc, sc->state);
> +		if (ret)
> +			dev_warn(sc->dev, "failed to register partner\n");
> +	} else if (event & SC27XX_DETACH_INT) {
> +		sprd_pmic_typec_disconnect(sc, sc->state);
> +	}
> +
> +clear_ints:
> +	regmap_write(sc->regmap, sc->base + sc->var_data->int_clr, event);
> +
> +	dev_info(sc->dev, "now works as DRP and is in %d state, event %d\n",
> +		sc->state, event);

When drivers work properly, they are quiet, please never spam the kernel
log for normal operations.

> +static ssize_t
> +sprd_pmic_typec_cc_polarity_role_show(struct device *dev, struct device_attribute *attr,
> +		char *buf)
> +{
> +	struct sprd_pmic_typec *sc = dev_get_drvdata(dev);
> +
> +	return snprintf(buf, 5, "%s\n", sprd_pmic_typec_cc_polarity_roles[sc->cc_polarity]);

sysfs_emit() please.

> +}
> +static DEVICE_ATTR_RO(sprd_pmic_typec_cc_polarity_role);

Where is this new sysfs file documented?

> +	ret = sysfs_create_groups(&sc->dev->kobj, sprd_pmic_typec_groups);

You just raced with userspace and lost, and better yet:

> +	if (ret < 0)
> +		dev_err(sc->dev, "failed to create cc_polarity %d\n", ret);

You do not even clean up properly here.

Please use the default groups for the driver and it should work just
fine.

> +	ret = sprd_pmic_typec_set_rtrim(sc);
> +	if (ret < 0) {
> +		dev_err(sc->dev, "failed to set typec rtrim %d\n", ret);
> +		goto error;
> +	}
> +
> +	ret = devm_request_threaded_irq(sc->dev, sc->irq, NULL,
> +					sprd_pmic_typec_interrupt,
> +					IRQF_EARLY_RESUME | IRQF_ONESHOT,
> +					dev_name(sc->dev), sc);

Are you sure you can use devm_() here?

> +static int sprd_pmic_typec_remove(struct platform_device *pdev)
> +{
> +	struct sprd_pmic_typec *sc = platform_get_drvdata(pdev);
> +
> +	sysfs_remove_groups(&sc->dev->kobj, sprd_pmic_typec_groups);

Again, should not be needed if you use the default groups of the
platform driver.

thanks,

greg k-h