linux-kernel - Re: [PATCH v3] mfd: Add support for Merrifield Basin Cove PMIC

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Date:   Mon, 24 Jun 2019 17:13:48 +0100
From:   Lee Jones <lee.jones@...aro.org>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] mfd: Add support for Merrifield Basin Cove PMIC

On Wed, 12 Jun 2019, Andy Shevchenko wrote:

> Add an MFD driver for Intel Merrifield Basin Cove PMIC.
> 
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> ---
> - updated copyright year to be 2019
> - rebased on top of latest vanilla rc
> 
>  drivers/mfd/Kconfig                      |  11 ++
>  drivers/mfd/Makefile                     |   1 +
>  drivers/mfd/intel_soc_pmic_mrfld.c       | 157 +++++++++++++++++++++++
>  include/linux/mfd/intel_soc_pmic_mrfld.h |  81 ++++++++++++
>  4 files changed, 250 insertions(+)
>  create mode 100644 drivers/mfd/intel_soc_pmic_mrfld.c
>  create mode 100644 include/linux/mfd/intel_soc_pmic_mrfld.h

[...]

> +static int bcove_probe(struct platform_device *pdev)
> +{
> +	struct device *dev = &pdev->dev;
> +	struct intel_soc_pmic *pmic;
> +	unsigned int i;
> +	int ret;
> +
> +	pmic = devm_kzalloc(dev, sizeof(*pmic), GFP_KERNEL);
> +	if (!pmic)
> +		return -ENOMEM;
> +
> +	platform_set_drvdata(pdev, pmic);
> +	pmic->dev = &pdev->dev;
> +
> +	pmic->regmap = devm_regmap_init(dev, NULL, pmic, &bcove_regmap_config);
> +	if (IS_ERR(pmic->regmap))
> +		return PTR_ERR(pmic->regmap);
> +
> +	for (i = 0; i < ARRAY_SIZE(irq_level2_resources); i++) {
> +		ret = platform_get_irq(pdev, i);

If you already know the order, define the children's device IDs in the
parent's shared header ('intel_soc_pmic_mrfld.h'?) and retreive them
like:

  platform_get_irq(pdev->parent, <SUITABLE_DEFINED_ID>);

Then you can skip all of this platform device -> platform device hoop
jumping.

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