On 04/04/2023 10:07, Herve Codina wrote:
>>> So, the structure I have in mind:
>>> - pef2256.c (MFD)
>>> implement and do the setup at probe()
>>> Add the children at probe():
>>> - pef2256-pinctrl (pinctrl) added using mfd_add_devices()
>>> - pef2256-codec (ASoC codec) added using devm_of_platform_populate()
>>>
>>> Lee, with this in mind, can the core pef2256.c be a MFD driver ?
>>
>> You do not use MFD here, so why do you want to keep it in MFD? If you
>> disagree, please tell me where is the MFD code in your patch?
>
> I don't want to absolutely use MFD.
> I just want to put my driver somewhere and I don't know the right location
> between MFD and Misc.
>
> Basically, the driver needs to do (little simplified and error path removed):
>
> static const struct mfd_cell pef2256_devs[] = {
> { .name = "lantiq-pef2256-pinctrl", },
> };
>
> static int pef2256_probe(struct platform_device *pdev)
> {
> struct pef2256 *pef2256;
> void __iomem *iomem;
> int ret;
> int irq;
>
> pef2256 = devm_kzalloc(&pdev->dev, sizeof(*pef2256), GFP_KERNEL);
> if (!pef2256)
> return -ENOMEM;
>
> pef2256->dev = &pdev->dev;
>
> iomem = devm_platform_ioremap_resource(pdev, 0);
>
> pef2256->regmap = devm_regmap_init_mmio(&pdev->dev, iomem,
> &pef2256_regmap_config);
>
> pef2256->mclk = devm_clk_get_enabled(&pdev->dev, "mclk");
> pef2256->sclkr = devm_clk_get_enabled(&pdev->dev, "sclkr");
> pef2256->sclkx = devm_clk_get_enabled(&pdev->dev, "sclkx");
>
> pef2256->reset_gpio = devm_gpiod_get_optional(&pdev->dev, "reset", GPIOD_OUT_LOW);
> if (pef2256->reset_gpio) {
> gpiod_set_value_cansleep(pef2256->reset_gpio, 1);
> udelay(10);
> gpiod_set_value_cansleep(pef2256->reset_gpio, 0);
> udelay(10);
> }
>
> pef2556_of_parse(pef2256, np);
>
> irq = platform_get_irq(pdev, 0);
> ret = devm_request_irq(pef2256->dev, irq, pef2256_irq_handler, 0, "pef2256", pef2256);
>
> platform_set_drvdata(pdev, pef2256);
>
> mfd_add_devices(pef2256->dev, PLATFORM_DEVID_NONE, pef2256_devs,
> ARRAY_SIZE(pef2256_devs), NULL, 0, NULL);
Wait, now you use MFD framework, so the driver is suitable for MFD.
Before there was nothing like that in your code.
Best regards,
Krzysztof
