Re: [PATCH v8 6/6] mfd: lpc_ich: Add support for Intel Apollo Lake GPIO pinctrl in non-ACPI system

From: Andy Shevchenko
Date: Wed Oct 12 2016 - 06:25:55 EST


On Wed, 2016-10-12 at 14:51 +0800, Tan Jui Nee wrote:
> This driver uses the P2SB hide/unhide mechanism cooperatively
> to pass the PCI BAR address to the gpio platform driver.
>

Almost minor issues below.

> --- a/drivers/mfd/Makefile
> +++ b/drivers/mfd/Makefile
> @@ -161,6 +161,10 @@ obj-$(CONFIG_MFD_INTEL_QUARK_I2C_GPIO) +=
> intel_quark_i2c_gpio.o
> Âobj-$(CONFIG_LPC_SCH) += lpc_sch.o
> Âlpc_ich-objs := lpc_ich_core.o

^^^

> Âobj-$(CONFIG_LPC_ICH) += lpc_ich.o
> +lpc_ich-objs := lpc_ich_core.o

^^^ duplication.

> +ifeq ($(CONFIG_X86_INTEL_IVI),y)
> +lpc_ich-objs += lpc_ich_apl.o
> +endif

> +++ b/drivers/mfd/lpc_ich_apl.c
> @@ -0,0 +1,120 @@
> +/*
> + * Intel Apollo Lake In-Vehicle Infotainment (IVI) systems used in
> cars support

> + *
> + * Copyright (C) 2016 Intel Corporation
> + *
> + * Author: Tan, Jui Nee <jui.nee.tan@xxxxxxxxx>
> + *
> + * This program is free software; you can redistribute it and/or
> modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + */
> +
> +#include <asm/p2sb.h>

Hmm... asm stuff is platform specific, better to put it in separate
section like:

#include <linux/a.h>
#include <linux/d.h>

#include <asm/b.h>

#include "c.h"

> +#include <linux/pci.h>
> +#include <linux/mfd/core.h>
> +#include <linux/mfd/lpc_ich.h>
> +#include <linux/pinctrl/pinctrl.h>
> +
> +#include "lpc_ich_apl.h"
> +
>

> +int lpc_ich_add_gpio(struct pci_dev *dev, enum lpc_chipsets chipset)
> +{
> + unsigned int i;
> + int ret;
> + struct resource base;
> +
>

> + if (chipset != LPC_APL)
> + return -ENODEV;

Replace this by positive check (see below). Moreover -ENODEV will be
returned if no cells were added.

> + /*
> + Â* Apollo lake, has not 1, but 4 gpio controllers,

Perhaps "Apollo lake has 4 gpio controllers,"

> + Â* handle it a bit differently.
> + Â*/
> +
> + ret = p2sb_bar(dev, PCI_DEVFN(PCI_IDSEL_P2SB, 0), &base);
> + if (ret)
> + goto warn_continue;
> +
> + for (i = 0; i < APL_GPIO_COMMUNITY_MAX; i++) {
> + struct resource *res = &apl_gpio_io_res[i];
> +
> + /* Fill MEM resource */
> + res->start += base.start;
> + res->end += base.start;
> + res->flags = base.flags;
> +
> + res++;
> + }
> +
> + ret = mfd_add_devices(&dev->dev, 0,
> + apl_gpio_devices, ARRAY_SIZE(apl_gpio_devices),
> + NULL, 0, NULL);
> +

> + if (ret)
> +warn_continue:

Swap them.

> + dev_warn(&dev->dev,
> + "Failed to add Apollo Lake GPIO: %d\n",
> + ret);
> +
> + return ret;
> +}


> +++ b/drivers/mfd/lpc_ich_apl.h
> @@ -0,0 +1,29 @@
> +/*
> + * lpc_ich_apl.h - Intel In-Vehicle Infotainment (IVI) systems used
> in cars
> + *ÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂsupport

> + *
> + * Copyright (C) 2016, Intel Corporation
> + *
> + * Author: Tan, Jui Nee <jui.nee.tan@xxxxxxxxx>
> + *
> + * This program is free software; you can redistribute it and/or
> modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + */
> +
> +#ifndef __LPC_ICH_APL_H__
> +#define __LPC_ICH_APL_H__
> +
> +#include <linux/pci.h>
> +
> +#if IS_ENABLED(CONFIG_X86_INTEL_IVI)
> +int lpc_ich_add_gpio(struct pci_dev *dev, enum lpc_chipsets chipset);
> +#else /* CONFIG_X86_INTEL_IVI is not set */
> +static inline int lpc_ich_add_gpio(struct pci_dev *dev,
> + enum lpc_chipsets chipset)
> +{
> + return -ENODEV;
> +}
> +#endif

Add comment here if you want to be looking like in p2sb.h.

> +
> +#endif
>

> --- a/drivers/mfd/lpc_ich_core.c
> +++ b/drivers/mfd/lpc_ich_core.c
> @@ -70,6 +70,8 @@
> Â#include <linux/mfd/lpc_ich.h>
> Â#include <linux/platform_data/itco_wdt.h>
> Â
> +#include "lpc_ich_apl.h"
> +
> Â#define ACPIBASE 0x40
> Â#define ACPIBASE_GPE_OFF 0x28
> Â#define ACPIBASE_GPE_END 0x2f
> @@ -1032,6 +1034,9 @@ static int lpc_ich_probe(struct pci_dev *dev,
> Â cell_added = true;
> Â }
> Â
> + if (!lpc_ich_add_gpio(dev, priv->chipset))
> + cell_added = true;
> +

Like it's already used:

if (priv->chipset == XXX) {
Âdo_yyy(dev);
Âcell_added = true;
}


--
Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Intel Finland Oy