linux-kernel - RE: [PATCH] mfd: add Intel Broxton Whiskey Cove PMIC driver

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Date:	Wed, 29 Apr 2015 16:55:31 +0000
From:	"Yang, Fei" <fei.yang@...el.com>
To:	"Zha, Qipeng" <qipeng.zha@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:	"lee.jones@...aro.org" <lee.jones@...aro.org>,
	"sameo@...ux.intel.com" <sameo@...ux.intel.com>,
	"Zhong, Huiquan" <huiquan.zhong@...el.com>,
	"Chen, Jason CJ" <jason.cj.chen@...el.com>,
	"Zheng, Qi" <qi.zheng@...el.com>
Subject: RE: [PATCH] mfd: add Intel Broxton Whiskey Cove PMIC driver

> +/* Whiskey Cove PMIC share same ACPI ID between different platforms */
> +#define BROXTON_PMIC_WC_HRV		4
> +static int bxtwc_probe(struct platform_device *pdev) {
> +	int ret;
> +	struct resource *res;
> +	struct intel_soc_pmic *pmic;
> +	acpi_status status;
> +	unsigned long long hrv;
> +	acpi_handle handle = ACPI_HANDLE(&pdev->dev);
> +
> +	status = acpi_evaluate_integer(handle, "_HRV", NULL, &hrv);
> +	if (ACPI_FAILURE(status)) {
> +		dev_err(&pdev->dev, "ACPI error when get _HRV\n");
> +		return -ENODEV;
> +	}
> +	if (hrv != BROXTON_PMIC_WC_HRV) {
> +		dev_err(&pdev->dev, "Wrong _HRV %llu\n", hrv);
> +		return -ENODEV;
> +	}
> +
> +	res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
> +	if (!res) {
> +		dev_err(&pdev->dev, "No irq resource?\n");
> +		return -ENOENT;
> +	}
> +
> +	pmic = devm_kzalloc(&pdev->dev, sizeof(*pmic), GFP_KERNEL);
> +	if (!pmic)
> +		return -ENOMEM;
> +
> +	dev_set_drvdata(&pdev->dev, pmic);
> +	pmic->irq = res->start;
> +	pmic->dev = &pdev->dev;
> +	pmic->default_i2c_addr = BXTWC_DEVICE1_ADDR;
> +
> +	pmic->regmap = devm_regmap_init_pmic_ipc(pmic, &bxtwc_regmap_config);
> +	if (IS_ERR(pmic->regmap)) {
> +		ret = PTR_ERR(pmic->regmap);
> +		dev_err(&pdev->dev, "Fail to init pmic ipc regmap: %d\n", ret);
> +		return ret;
> +	}
> +
> +	ret = regmap_add_irq_chip(pmic->regmap, pmic->irq,
> +				  IRQF_ONESHOT | IRQF_SHARED,
> +				  0, &bxtwc_regmap_irq_chip,
> +				  &pmic->irq_chip_data);
> +	if (ret) {
> +		dev_err(&pdev->dev, "Fail to add irq chip\n");
> +		goto err_irq_chip;
> +	}

I ran into a kernel panic in regmap_exit in case the above regmap_add_irq_chip call failed.
I don't see other PMIC drivers is calling regmap_exit, can you investigate if that is necessary?

> +err_irq_chip:
> +	regmap_exit(pmic->regmap);
> +
> +	return ret;
> +}
> +
> +static int bxtwc_remove(struct platform_device *pdev) {
> +	struct intel_soc_pmic *pmic = dev_get_drvdata(&pdev->dev);
> +
> +	sysfs_remove_group(&pdev->dev.kobj, &bxtwc_group);
> +	mfd_remove_devices(&pdev->dev);
> +	regmap_del_irq_chip(pmic->irq, pmic->irq_chip_data);
> +	regmap_del_irq_chip(pmic->irq, pmic->irq_chip_data_level2);
> +	regmap_exit(pmic->regmap);

Please investigate if regmap_exit call is necessary.

> +	return 0;
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