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Date: Wed, 10 Mar 2021 10:27:16 +0000
From: Lee Jones <lee.jones@...aro.org>
To: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
gregkh@...uxfoundation.org
Cc: Wolfram Sang <wsa+renesas@...g-engineering.com>,
Jean Delvare <jdelvare@...e.de>,
Tan Jui Nee <jui.nee.tan@...el.com>,
Jim Quinlan <james.quinlan@...adcom.com>,
Jonathan Yong <jonathan.yong@...el.com>,
Bjorn Helgaas <bhelgaas@...gle.com>,
linux-kernel@...r.kernel.org, linux-i2c@...r.kernel.org,
linux-pci@...r.kernel.org, Jean Delvare <jdelvare@...e.com>,
Peter Tyser <ptyser@...-inc.com>, hdegoede@...hat.com,
henning.schild@...mens.com
Subject: Re: [PATCH v1 6/7] mfd: lpc_ich: Add support for pinctrl in non-ACPI
system
On Mon, 08 Mar 2021, Andy Shevchenko wrote:
> From: Tan Jui Nee <jui.nee.tan@...el.com>
>
> 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@...el.com>
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> ---
> 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
Big C or little c? Please be consistent.
> * Copyright (c) 2011 Extreme Engineering Solution, Inc.
> * Author: Aaron Sierra <asierra@...-inc.com>
> *
> @@ -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
> +#define APL_GPIO_WEST_OFFSET 0xc70000
> +#define APL_GPIO_WEST_SIZE 0x674
> +
> +#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,
Do these have to be hard-coded?
> + .num_resources = ARRAY_SIZE(apl_gpio_resources[0]),
> + .resources = apl_gpio_resources[0],
You can make this less fragile by defining the index and using:
[DEFINE_X_Y_Z] = { /* resource */ }, /* etc */
... above.
> + .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);
What is 13 and 0? Should these be defined?
> + 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;
> + }
So you're converting PCI devices to platform devices.
I'm not sure how 'okay' that is.
Adding Greg to see if he has an opinion.
> + return mfd_add_devices(&dev->dev, 0, apl_gpio_devices,
Please use the defines, rather than 0.
> + 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)
--
Lee Jones [李琼斯]
Senior Technical Lead - Developer Services
Linaro.org │ Open source software for Arm SoCs
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