Re: [PATCH v1 6/7] mfd: lpc_ich: Add support for pinctrl in non-ACPI system

[Henning Schild]

Tan or Andy,

maybe you can point me to a user of that patch. I guess there might be
an out-of-tree driver or userland code on how to use the GPIOs from
there.

Feel free to send directly to me in case it is not published anywhere
and should not yet be on the list, i could just use it for inspiration.
A driver will likely be GPL anyways.

regards,
Henning

Am Mon, 12 Apr 2021 18:01:06 +0200
schrieb Henning Schild <henning.schild@xxxxxxxxxxx>:

> Am Mon, 8 Mar 2021 14:20:19 +0200
> schrieb Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>:
> 
> > From: Tan Jui Nee <jui.nee.tan@xxxxxxxxx>
> > 
> > Add support for non-ACPI systems, such as system that uses
> > Advanced Boot Loader (ABL) whereby a platform device has to be
> > created in order to bind with pin control and GPIO.
> > 
> > At the moment, Intel Apollo Lake In-Vehicle Infotainment (IVI)
> > system requires a driver to hide and unhide P2SB to lookup P2SB BAR
> > and pass the PCI BAR address to GPIO.
> > 
> > Signed-off-by: Tan Jui Nee <jui.nee.tan@xxxxxxxxx>
> > Signed-off-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
> > ---
> >  drivers/mfd/lpc_ich.c | 100
> > +++++++++++++++++++++++++++++++++++++++++- 1 file changed, 99
> > insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/mfd/lpc_ich.c b/drivers/mfd/lpc_ich.c
> > index 8e9bd6813287..959247b6987a 100644
> > --- a/drivers/mfd/lpc_ich.c
> > +++ b/drivers/mfd/lpc_ich.c
> > @@ -8,7 +8,8 @@
> >   *  Configuration Registers.
> >   *
> >   *  This driver is derived from lpc_sch.
> > -
> > + *
> > + *  Copyright (C) 2017, 2021 Intel Corporation
> >   *  Copyright (c) 2011 Extreme Engineering Solution, Inc.
> >   *  Author: Aaron Sierra <asierra@xxxxxxxxxxx>
> >   *
> > @@ -43,6 +44,7 @@
> >  #include <linux/acpi.h>
> >  #include <linux/pci.h>
> >  #include <linux/pci-p2sb.h>
> > +#include <linux/pinctrl/pinctrl.h>
> >  #include <linux/mfd/core.h>
> >  #include <linux/mfd/lpc_ich.h>
> >  #include <linux/platform_data/itco_wdt.h>
> > @@ -140,6 +142,73 @@ static struct mfd_cell lpc_ich_gpio_cell = {
> >  	.ignore_resource_conflicts = true,
> >  };
> >  
> > +/* Offset data for Apollo Lake GPIO controllers */
> > +#define APL_GPIO_SOUTHWEST_OFFSET	0xc00000
> > +#define APL_GPIO_SOUTHWEST_SIZE		0x654
> > +#define APL_GPIO_NORTHWEST_OFFSET	0xc40000
> > +#define APL_GPIO_NORTHWEST_SIZE		0x764
> > +#define APL_GPIO_NORTH_OFFSET		0xc50000
> > +#define APL_GPIO_NORTH_SIZE		0x76c  
> 
> drivers/pinctrl/intel/pinctrl-broxton.c:653
> BXT_COMMUNITY(0, 77),
> 
> > +#define APL_GPIO_WEST_OFFSET		0xc70000
> > +#define APL_GPIO_WEST_SIZE		0x674  
> 
> All these sizes correlate with 4 magic numbers from pinctrl-broxton.
> 
> SIZE - 0x500 (pad_base?) - 4 (no clue) / 8
> 
> It might be worth basing both numbers on a define and giving the magic
> numbers some names.
> 
> But all this seems like duplication of pinctrl-broxton, maybe the
> pinctrl driver should unhide the p2sb ...
> 
> regards,
> Henning
> 
> > +
> > +#define APL_GPIO_NR_DEVICES		4
> > +#define APL_GPIO_IRQ			14
> > +
> > +static struct resource apl_gpio_resources[APL_GPIO_NR_DEVICES][2]
> > = {
> > +	{
> > +		DEFINE_RES_MEM(APL_GPIO_NORTH_OFFSET,
> > APL_GPIO_NORTH_SIZE),
> > +		DEFINE_RES_IRQ(APL_GPIO_IRQ),
> > +	},
> > +	{
> > +		DEFINE_RES_MEM(APL_GPIO_NORTHWEST_OFFSET,
> > APL_GPIO_NORTHWEST_SIZE),
> > +		DEFINE_RES_IRQ(APL_GPIO_IRQ),
> > +	},
> > +	{
> > +		DEFINE_RES_MEM(APL_GPIO_WEST_OFFSET,
> > APL_GPIO_WEST_SIZE),
> > +		DEFINE_RES_IRQ(APL_GPIO_IRQ),
> > +	},
> > +	{
> > +		DEFINE_RES_MEM(APL_GPIO_SOUTHWEST_OFFSET,
> > APL_GPIO_SOUTHWEST_SIZE),
> > +		DEFINE_RES_IRQ(APL_GPIO_IRQ),
> > +	},
> > +};
> > +
> > +/* The order must be in sync with apl_pinctrl_soc_data */
> > +static const struct mfd_cell apl_gpio_devices[APL_GPIO_NR_DEVICES]
> > = {
> > +	{
> > +		/* North */
> > +		.name = "apollolake-pinctrl",
> > +		.id = 0,
> > +		.num_resources = ARRAY_SIZE(apl_gpio_resources[0]),
> > +		.resources = apl_gpio_resources[0],
> > +		.ignore_resource_conflicts = true,
> > +	},
> > +	{
> > +		/* NorthWest */
> > +		.name = "apollolake-pinctrl",
> > +		.id = 1,
> > +		.num_resources = ARRAY_SIZE(apl_gpio_resources[1]),
> > +		.resources = apl_gpio_resources[1],
> > +		.ignore_resource_conflicts = true,
> > +	},
> > +	{
> > +		/* West */
> > +		.name = "apollolake-pinctrl",
> > +		.id = 2,
> > +		.num_resources = ARRAY_SIZE(apl_gpio_resources[2]),
> > +		.resources = apl_gpio_resources[2],
> > +		.ignore_resource_conflicts = true,
> > +	},
> > +	{
> > +		/* SouthWest */
> > +		.name = "apollolake-pinctrl",
> > +		.id = 3,
> > +		.num_resources = ARRAY_SIZE(apl_gpio_resources[3]),
> > +		.resources = apl_gpio_resources[3],
> > +		.ignore_resource_conflicts = true,
> > +	},
> > +};
> >  
> >  static struct mfd_cell lpc_ich_spi_cell = {
> >  	.name = "intel-spi",
> > @@ -1082,6 +1151,29 @@ static int lpc_ich_init_wdt(struct pci_dev
> > *dev) return ret;
> >  }
> >  
> > +static int lpc_ich_init_pinctrl(struct pci_dev *dev)
> > +{
> > +	struct resource base;
> > +	unsigned int i;
> > +	int ret;
> > +
> > +	ret = pci_p2sb_bar(dev, PCI_DEVFN(13, 0), &base);
> > +	if (ret)
> > +		return ret;
> > +
> > +	for (i = 0; i < ARRAY_SIZE(apl_gpio_devices); i++) {
> > +		struct resource *mem = &apl_gpio_resources[i][0];
> > +
> > +		/* Fill MEM resource */
> > +		mem->start += base.start;
> > +		mem->end += base.start;
> > +		mem->flags = base.flags;
> > +	}
> > +
> > +	return mfd_add_devices(&dev->dev, 0, apl_gpio_devices,
> > +			       ARRAY_SIZE(apl_gpio_devices), NULL,
> > 0, NULL); +}
> > +
> >  static void lpc_ich_test_spi_write(struct pci_dev *dev, unsigned
> > int devfn, struct intel_spi_boardinfo *info)
> >  {
> > @@ -1198,6 +1290,12 @@ static int lpc_ich_probe(struct pci_dev *dev,
> >  			cell_added = true;
> >  	}
> >  
> > +	if (priv->chipset == LPC_APL) {
> > +		ret = lpc_ich_init_pinctrl(dev);
> > +		if (!ret)
> > +			cell_added = true;
> > +	}
> > +
> >  	if (lpc_chipset_info[priv->chipset].spi_type) {
> >  		ret = lpc_ich_init_spi(dev);
> >  		if (!ret)  
>