Linux-i2c Archive on lore.kernel.org
 help / color / Atom feed
From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
To: Henning Schild <henning.schild@siemens.com>
Cc: Wolfram Sang <wsa+renesas@sang-engineering.com>,
	Jean Delvare <jdelvare@suse.de>, Lee Jones <lee.jones@linaro.org>,
	Tan Jui Nee <jui.nee.tan@intel.com>,
	Jim Quinlan <james.quinlan@broadcom.com>,
	Jonathan Yong <jonathan.yong@intel.com>,
	Bjorn Helgaas <bhelgaas@google.com>,
	linux-kernel@vger.kernel.org, linux-i2c@vger.kernel.org,
	linux-pci@vger.kernel.org, Jean Delvare <jdelvare@suse.com>,
	Peter Tyser <ptyser@xes-inc.com>,
	hdegoede@redhat.com
Subject: Re: [PATCH v1 6/7] mfd: lpc_ich: Add support for pinctrl in non-ACPI system
Date: Mon, 12 Apr 2021 19:51:42 +0300
Message-ID: <YHR6njWCHn77v7lQ@smile.fi.intel.com> (raw)
In-Reply-To: <20210412180106.7dc524e8@md1za8fc.ad001.siemens.net>

On Mon, Apr 12, 2021 at 06:01:06PM +0200, Henning Schild wrote:
> Am Mon, 8 Mar 2021 14:20:19 +0200
> schrieb Andy Shevchenko <andriy.shevchenko@linux.intel.com>:
> 
> > From: Tan Jui Nee <jui.nee.tan@intel.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.

...

> > +/* 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.

I didn't get this, sorry. The numbers above just precise sizes of the
resources. Actually they all one page anyway, so, I can drop magic of SIZEs and
leave only offsets.

> But all this seems like duplication of pinctrl-broxton, maybe the
> pinctrl driver should unhide the p2sb ...

Definitely should not. It's not a business of the pin control driver to know
how it has to be instantiated (or from what data). These offsets belong to the
platform description and since firmware hides the device without given an
appropriate ACPI device node, we have only one choice (assuming firmware is
carved in stone) -- board files.

P2SB on the other hand is a slice of many (independent) devices. There is no
"proper" place to unhide it except some core part of x86 / PCI.


-- 
With Best Regards,
Andy Shevchenko



  parent reply index

Thread overview: 44+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-08 12:20 [rfc, PATCH v1 0/7] PCI: introduce p2sb helper Andy Shevchenko
2021-03-08 12:20 ` [PATCH v1 1/7] PCI: Introduce pci_bus_*() printing macros when device is not available Andy Shevchenko
2021-03-10 14:57   ` Jean Delvare
2021-03-08 12:20 ` [PATCH v1 2/7] PCI: Convert __pci_read_base() to __pci_bus_read_base() Andy Shevchenko
2021-03-10 17:14   ` Christoph Hellwig
2021-03-08 12:20 ` [PATCH v1 3/7] PCI: New Primary to Sideband (P2SB) bridge support library Andy Shevchenko
2021-03-08 18:52   ` Bjorn Helgaas
2021-03-08 19:16     ` Andy Shevchenko
2021-03-09  1:42       ` Bjorn Helgaas
2021-03-09  8:42         ` Henning Schild
2021-04-02 13:09           ` Enrico Weigelt, metux IT consult
2021-04-06 13:40             ` Henning Schild
2021-03-13  9:45   ` Henning Schild
2021-04-01 15:43     ` Andy Shevchenko
2021-04-01 18:06       ` Mika Westerberg
2021-04-01 18:22         ` Andy Shevchenko
2021-04-01 18:32           ` Mika Westerberg
2021-03-08 12:20 ` [PATCH v1 4/7] mfd: lpc_ich: Factor out lpc_ich_enable_spi_write() Andy Shevchenko
2021-03-10 10:29   ` Lee Jones
2021-03-08 12:20 ` [PATCH v1 5/7] mfd: lpc_ich: Switch to generic pci_p2sb_bar() Andy Shevchenko
2021-03-10 10:35   ` Lee Jones
2021-03-10 12:05     ` Andy Shevchenko
2021-03-10 12:57       ` Lee Jones
2021-03-08 12:20 ` [PATCH v1 6/7] mfd: lpc_ich: Add support for pinctrl in non-ACPI system Andy Shevchenko
2021-03-10 10:27   ` Lee Jones
2021-04-12 16:01   ` Henning Schild
2021-04-12 16:40     ` Henning Schild
2021-04-12 16:59       ` Andy Shevchenko
2021-04-12 17:16         ` Henning Schild
2021-04-12 17:34           ` Andy Shevchenko
2021-04-13  6:47             ` Henning Schild
2021-04-12 16:51     ` Andy Shevchenko [this message]
2021-04-12 17:27       ` Henning Schild
2021-04-12 17:41         ` Andy Shevchenko
2021-03-08 12:20 ` [PATCH v1 7/7] i2c: i801: convert to use common P2SB accessor Andy Shevchenko
2021-03-10 14:51   ` Jean Delvare
2021-03-13  9:25 ` [rfc, PATCH v1 0/7] PCI: introduce p2sb helper Henning Schild
2021-06-10  9:02 ` Henning Schild
2021-06-10 10:14   ` Andy Shevchenko
2021-06-10 13:48     ` Henning Schild
2021-06-10 14:04       ` Andy Shevchenko
2021-04-01 15:45 [PATCH v1 3/7] PCI: New Primary to Sideband (P2SB) bridge support library Andy Shevchenko
2021-04-01 16:42 ` Bjorn Helgaas
2021-04-01 18:23   ` Andy Shevchenko
2021-04-01 18:44     ` Bjorn Helgaas

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=YHR6njWCHn77v7lQ@smile.fi.intel.com \
    --to=andriy.shevchenko@linux.intel.com \
    --cc=bhelgaas@google.com \
    --cc=hdegoede@redhat.com \
    --cc=henning.schild@siemens.com \
    --cc=james.quinlan@broadcom.com \
    --cc=jdelvare@suse.com \
    --cc=jdelvare@suse.de \
    --cc=jonathan.yong@intel.com \
    --cc=jui.nee.tan@intel.com \
    --cc=lee.jones@linaro.org \
    --cc=linux-i2c@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-pci@vger.kernel.org \
    --cc=ptyser@xes-inc.com \
    --cc=wsa+renesas@sang-engineering.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

Linux-i2c Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/linux-i2c/0 linux-i2c/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 linux-i2c linux-i2c/ https://lore.kernel.org/linux-i2c \
		linux-i2c@vger.kernel.org
	public-inbox-index linux-i2c

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.linux-i2c


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git