Linux-ARM-Kernel Archive on lore.kernel.org
 help / color / Atom feed
From: l.stach@pengutronix.de (Lucas Stach)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 3/3] PCI: imx: Add support for i.MX8MQ
Date: Tue, 27 Nov 2018 11:06:09 +0100
Message-ID: <1543313169.2507.39.camel@pengutronix.de> (raw)
In-Reply-To: <CAHQ1cqH6LT4GsxUchrmVG1m3fqawgyUjxdHvh=SzxhBiQOd8eg@mail.gmail.com>

Hi Andrey,

Am Montag, den 26.11.2018, 10:24 -0800 schrieb Andrey Smirnov:
> On Tue, Nov 20, 2018 at 2:49 AM Leonard Crestez <leonard.crestez@nxp.com> wrote:
> > 
> > On Sat, 2018-11-17 at 10:12 -0800, Andrey Smirnov wrote:
> > > @@ -921,7 +1004,28 @@ static int imx6_pcie_probe(struct platform_device *pdev)
> > > -?????case IMX7D:
> > > +?????case IMX8MQ:
> > > +?????????????if (of_property_read_u32(node, "fsl,iomux-gpr1x",
> > > +??????????????????????????????????????&imx6_pcie->gpr1x)) {
> > > +?????????????????????dev_err(dev, "Failed to get GPR1x address\n");
> > > +?????????????????????return -EINVAL;
> > > +?????????????}
> > 
> > This is for distinguishing multiple controllers on the SOC but other
> > registers and bits might differ. Isn't it preferable to have a property
> > for controller id instead of adding many registers to DT?
> > 
> 
> I liked encoding necessary info in DT directly slightly better than
> encoding abstract ID and then decoding it further in the driver code.
> OTOH, I am not really attached to that path. Lucas, can you comment on
> this please?

Yes, after rereading the patch with this in mind I agree that having
the GPR offset on DT directly is IMO the better approach than an
abstract ID.

One other thing I noticed is that we probably need some property to
encode if the clock is supplied by an external clkgen, or if the clock
is provided by the i.MX. Hardcoding this in the driver will lead to DT
backward compatibility headaches later on if someone decides to build a
board with the clock provided from the i.MX.

Regards,
Lucas

  reply index

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-11-17 18:12 [PATCH 0/3] PCIE " andrew.smirnov
2018-11-17 18:12 ` [PATCH 1/3] PCI: imx: No-op imx6_setup_phy_mpll() on i.MX7D andrew.smirnov
2018-11-17 18:12 ` [PATCH 2/3] PCI: imx: No-op imx6_pcie_reset_phy() " andrew.smirnov
2018-11-20  1:22   ` tpiepho
2018-11-26 18:32     ` andrew.smirnov
2018-11-17 18:12 ` [PATCH 3/3] PCI: imx: Add support for i.MX8MQ andrew.smirnov
2018-11-19  7:07   ` hongxing.zhu
2018-11-26 18:09     ` andrew.smirnov
2018-11-29 10:52       ` hongxing.zhu
2018-11-20 10:48   ` leonard.crestez
2018-11-26 18:24     ` andrew.smirnov
2018-11-27 10:06       ` l.stach [this message]
2018-11-27 10:46         ` leonard.crestez
2018-11-27 21:14           ` andrew.smirnov
2018-11-28 10:55             ` leonard.crestez
2018-11-29 11:15               ` l.stach
2018-11-29 11:12             ` l.stach
2018-11-27 10:16       ` leonard.crestez
2018-11-27 21:03         ` andrew.smirnov
2018-12-03 12:20 ` [PATCH 0/3] PCIE " Lorenzo Pieralisi
2018-12-07 11:37 ` Lorenzo Pieralisi

Reply instructions:

You may reply publically 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=1543313169.2507.39.camel@pengutronix.de \
    --to=l.stach@pengutronix.de \
    --cc=linux-arm-kernel@lists.infradead.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

Linux-ARM-Kernel Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/linux-arm-kernel/0 linux-arm-kernel/git/0.git
	git clone --mirror https://lore.kernel.org/linux-arm-kernel/1 linux-arm-kernel/git/1.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-arm-kernel linux-arm-kernel/ https://lore.kernel.org/linux-arm-kernel \
		linux-arm-kernel@lists.infradead.org infradead-linux-arm-kernel@archiver.kernel.org
	public-inbox-index linux-arm-kernel

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.infradead.lists.linux-arm-kernel


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