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,
Mika Westerberg <mika.westerberg@linux.intel.com>
Subject: Re: [PATCH v1 3/7] PCI: New Primary to Sideband (P2SB) bridge support library
Date: Thu, 1 Apr 2021 18:43:11 +0300 [thread overview]
Message-ID: <YGXqDxSJhCO9bD1X@smile.fi.intel.com> (raw)
In-Reply-To: <20210313104557.321de08e@md1za8fc.ad001.siemens.net>
On Sat, Mar 13, 2021 at 10:45:57AM +0100, Henning Schild wrote:
> Am Mon, 8 Mar 2021 14:20:16 +0200
> schrieb Andy Shevchenko <andriy.shevchenko@linux.intel.com>:
...
> > + * pci_p2sb_bar - Get Primary to Sideband bridge (P2SB) device BAR
> > + * @pdev: PCI device to get a PCI bus to communicate with
> > + * @devfn: PCI slot and function to communicate with
> > + * @mem: memory resource to be filled in
>
> Do we really need that many arguments to it?
>
> Before i had, in a platform driver that never had its own pci_dev or bus
>
> res->start = simatic_ipc_get_membase0(PCI_DEVFN(13, 0));
> if (res-start == 0)
> return -ENODEV;
>
> So helper only asked for the devfn, returned base and no dedicated
> error code.
>
> With this i need
>
> struct pci_bus *bus = pci_find_bus(0, 0);
> struct pci_dev *pci_dev = bus->self;
> unsigned int magic_i_do_not_want = PCI_DEVFN(13, 0);
What confuses me is the use for SPI NOR controller on Broxton. And I think
we actually can indeed hide all this under the hood by exposing P2SB to the OS.
Mika, what do you think?
> I guess that second devfn is for devices behind that bridge. So
> unhiding it might reveal several devices?
Good question. I need a device where actually this happens (hidden P2SB stuff
with let's say SPI NOR there) to see how it looks like in such case. I only
understood the GPIO part. But I'm not so sure anymore.
> But when caring about that
> p2sb do i really need to know its devfn. If so i would like to get
--
With Best Regards,
Andy Shevchenko
next prev parent reply other threads:[~2021-04-01 18:45 UTC|newest]
Thread overview: 54+ 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
2021-04-01 15:45 ` Andy Shevchenko
2021-04-01 16:42 ` Bjorn Helgaas
2021-04-01 18:23 ` Andy Shevchenko
2021-04-01 18:44 ` Bjorn Helgaas
2021-07-12 12:15 ` Andy Shevchenko
2021-11-26 15:10 ` Andy Shevchenko
2021-04-02 13:09 ` Enrico Weigelt, metux IT consult
2021-04-06 13:40 ` Henning Schild
2021-07-12 12:11 ` Andy Shevchenko
2021-11-26 15:38 ` Andy Shevchenko
2021-11-29 21:07 ` Bjorn Helgaas
2021-12-08 17:51 ` Andy Shevchenko
2021-03-13 9:45 ` Henning Schild
2021-04-01 15:43 ` Andy Shevchenko [this message]
2021-04-01 18:06 ` Mika Westerberg
2021-04-01 18:22 ` Andy Shevchenko
2021-04-01 18:32 ` Mika Westerberg
2021-07-12 12:13 ` Andy Shevchenko
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
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
2021-12-21 15:08 ` Andy Shevchenko
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
2021-11-26 15:43 ` Andy Shevchenko
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