On Tue, 04 Apr 2023, Krzysztof Kozlowski wrote:
> 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.
Agree, the above is suitable for MFD, since it does all the things I
said your last one did not. You *can* also use of_platform_populate()
here, since you are *also* requesting and initialising shared resources.
You cannot do *both* however.
--
Lee Jones [李琼斯]
