From: Grant Likely <grant.likely@arm.com>
To: Andrew Lunn <andrew@lunn.ch>,
Calvin Johnson <calvin.johnson@oss.nxp.com>
Cc: "Rafael J . Wysocki" <rafael@kernel.org>,
Jeremy Linton <jeremy.linton@arm.com>,
Russell King - ARM Linux admin <linux@armlinux.org.uk>,
Jon <jon@solid-run.com>,
Cristi Sovaiala <cristian.sovaiala@nxp.com>,
Ioana Ciornei <ioana.ciornei@nxp.com>,
Andy Shevchenko <andy.shevchenko@gmail.com>,
Florian Fainelli <f.fainelli@gmail.com>,
Madalin Bucur <madalin.bucur@oss.nxp.com>,
netdev@vger.kernel.org, linux.cj@gmail.com,
linux-acpi@vger.kernel.org, nd <nd@arm.com>
Subject: Re: [net-next PATCH v7 1/6] Documentation: ACPI: DSD: Document MDIO PHY
Date: Tue, 29 Sep 2020 16:53:47 +0100 [thread overview]
Message-ID: <8dff0439-100c-cdee-915f-e793b55f9007@arm.com> (raw)
In-Reply-To: <20200929134302.GF3950513@lunn.ch>
On 29/09/2020 14:43, Andrew Lunn wrote:
> On Tue, Sep 29, 2020 at 10:47:03AM +0530, Calvin Johnson wrote:
>> Hi Grant,
>>
>> On Fri, Sep 25, 2020 at 02:34:21PM +0100, Grant Likely wrote:
>>>> +DSDT entry for MDIO node
>>>> +------------------------
>>>> +a) Silicon Component
>>>> +--------------------
>>>> + Scope(_SB)
>>>> + {
>>>> + Device(MDI0) {
>>>> + Name(_HID, "NXP0006")
>>>> + Name(_CCA, 1)
>>>> + Name(_UID, 0)
>>>> + Name(_CRS, ResourceTemplate() {
>>>> + Memory32Fixed(ReadWrite, MDI0_BASE, MDI_LEN)
>>>> + Interrupt(ResourceConsumer, Level, ActiveHigh, Shared)
>>>> + {
>>>> + MDI0_IT
>>>> + }
>>>> + }) // end of _CRS for MDI0
>>>> + Name (_DSD, Package () {
>>>> + ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"),
>>>> + Package () {
>>>> + Package () {"little-endian", 1},
>>>> + }
>>>
>>> Adopting the 'little-endian' property here makes little sense. This looks
>>> like legacy from old PowerPC DT platforms that doesn't belong here. I would
>>> drop this bit.
>>
>> I'm unable to drop this as the xgmac_mdio driver relies on this variable to
>> change the io access to little-endian. Default is big-endian.
>> Please see:
>> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/net/ethernet/freescale/xgmac_mdio.c?h=v5.9-rc7#n55
>
> Hi Calvin
>
> Are we talking about the bus controller endiannes, or the CPU
> endianness?
This is orthogonal to the MDIO bus issue. This is a legacy of the xgmac
IP block originating in PowerPC platforms with a big-endian bus wiring.
The flag here tells the driver to use little endian when accessing MMIO
registers.
> If we are talking about the CPU endiannes, are you plan on supporting
> any big endian platforms using ACPI? If not, just hard code it.
> Newbie ACPI question: Does ACPI even support big endian CPUs, given
> its x86 origins? >
> If this is the bus controller endianness, are all the SoCs you plan to
> support via ACPI the same endianness? If they are all the same, you
> can hard code it.
I would agree. The ACPI and DT probe paths are different. It would be
easy to automatically set the little-endian flag by default when xgmac
is described via ACPI.
g.
next prev parent reply other threads:[~2020-09-29 15:54 UTC|newest]
Thread overview: 61+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-15 9:03 [net-next PATCH v7 0/6] ACPI support for dpaa2 MAC driver Calvin Johnson
2020-07-15 9:03 ` [net-next PATCH v7 1/6] Documentation: ACPI: DSD: Document MDIO PHY Calvin Johnson
2020-07-16 3:04 ` Florian Fainelli
2020-07-16 3:11 ` Andrew Lunn
2020-07-23 23:26 ` Jeremy Linton
2020-07-24 13:39 ` Andrew Lunn
2020-07-24 17:26 ` Jeremy Linton
2020-07-24 17:39 ` Florian Fainelli
2020-07-24 19:20 ` Andrew Lunn
2020-07-24 20:12 ` Andy Shevchenko
2020-07-24 20:13 ` Florian Fainelli
2020-07-24 20:20 ` Andy Shevchenko
2020-07-25 7:36 ` Calvin Johnson
2020-07-25 10:48 ` Andy Shevchenko
2020-07-24 21:06 ` Russell King - ARM Linux admin
2020-07-27 17:03 ` Sudeep Holla
2020-07-24 19:14 ` Andrew Lunn
2020-07-27 17:21 ` Sudeep Holla
2020-07-28 20:34 ` Andrew Lunn
2020-07-28 20:59 ` Russell King - ARM Linux admin
2020-07-28 21:26 ` Andy Shevchenko
2020-07-29 16:00 ` Rafael J. Wysocki
2020-07-31 15:08 ` Andrew Lunn
2020-07-27 17:32 ` Jon Nettleton
[not found] ` <1595922651-sup-5323@galangal.danc.bne.opengear.com>
2020-07-28 20:45 ` Andrew Lunn
2020-07-28 20:56 ` Florian Fainelli
2020-07-28 21:28 ` Andy Shevchenko
2020-07-28 21:40 ` Florian Fainelli
2020-07-31 15:14 ` Andrew Lunn
2020-09-25 13:22 ` Grant Likely
2020-07-28 22:30 ` Jeremy Linton
2020-07-29 0:39 ` Florian Fainelli
2020-07-29 2:53 ` Jeremy Linton
2020-07-29 3:16 ` Florian Fainelli
2020-07-29 8:43 ` Jon Nettleton
2020-07-29 9:39 ` Calvin Johnson
2020-09-25 13:34 ` Grant Likely
2020-09-26 4:30 ` Calvin Johnson
2020-09-29 5:17 ` Calvin Johnson
2020-09-29 13:43 ` Andrew Lunn
2020-09-29 13:55 ` Andy Shevchenko
2020-09-29 14:32 ` Andrew Lunn
2020-09-29 14:46 ` Andy Shevchenko
2020-09-29 15:06 ` Andrew Lunn
2020-09-29 15:29 ` Arnd Bergmann
2020-09-29 14:44 ` Arnd Bergmann
2020-09-29 14:59 ` Andrew Lunn
2020-09-29 15:59 ` Grant Likely
2020-09-29 15:53 ` Grant Likely [this message]
2020-09-29 16:04 ` Calvin Johnson
2020-07-15 9:03 ` [net-next PATCH v7 2/6] net: phy: introduce device_mdiobus_register() Calvin Johnson
2020-07-16 3:05 ` Florian Fainelli
2020-07-15 9:03 ` [net-next PATCH v7 3/6] net/fsl: use device_mdiobus_register() Calvin Johnson
2020-07-16 3:05 ` Florian Fainelli
2020-07-15 9:03 ` [net-next PATCH v7 4/6] net: phy: introduce phy_find_by_mdio_handle() Calvin Johnson
2020-07-16 3:06 ` Florian Fainelli
2020-07-15 9:03 ` [net-next PATCH v7 5/6] phylink: introduce phylink_fwnode_phy_connect() Calvin Johnson
2020-07-15 9:04 ` [net-next PATCH v7 6/6] net: dpaa2-mac: Add ACPI support for DPAA2 MAC driver Calvin Johnson
2020-09-25 13:39 ` [net-next PATCH v7 0/6] ACPI support for dpaa2 " Grant Likely
2020-09-26 4:34 ` Calvin Johnson
2020-07-25 14:23 Calvin Johnson
2020-07-25 14:23 ` [net-next PATCH v7 1/6] Documentation: ACPI: DSD: Document MDIO PHY Calvin Johnson
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=8dff0439-100c-cdee-915f-e793b55f9007@arm.com \
--to=grant.likely@arm.com \
--cc=andrew@lunn.ch \
--cc=andy.shevchenko@gmail.com \
--cc=calvin.johnson@oss.nxp.com \
--cc=cristian.sovaiala@nxp.com \
--cc=f.fainelli@gmail.com \
--cc=ioana.ciornei@nxp.com \
--cc=jeremy.linton@arm.com \
--cc=jon@solid-run.com \
--cc=linux-acpi@vger.kernel.org \
--cc=linux.cj@gmail.com \
--cc=linux@armlinux.org.uk \
--cc=madalin.bucur@oss.nxp.com \
--cc=nd@arm.com \
--cc=netdev@vger.kernel.org \
--cc=rafael@kernel.org \
/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
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).