linux-kernel - Re: [PATCH v4 3/3] PCI: imx6: Add code to support i.MX7D

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Date:   Thu, 16 Feb 2017 10:18:34 +0100
From:   Lucas Stach <l.stach@...gutronix.de>
To:     Bjorn Helgaas <helgaas@...nel.org>
Cc:     Rob Herring <robh@...nel.org>,
        Andrey Smirnov <andrew.smirnov@...il.com>,
        linux-pci@...r.kernel.org, yurovsky@...il.com,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Mark Rutland <mark.rutland@....com>,
        Lee Jones <lee.jones@...aro.org>,
        Fabio Estevam <fabio.estevam@....com>,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 3/3] PCI: imx6: Add code to support i.MX7D

Am Mittwoch, den 15.02.2017, 15:57 -0600 schrieb Bjorn Helgaas:
> On Wed, Feb 15, 2017 at 03:26:24PM -0600, Rob Herring wrote:
> > On Wed, Feb 15, 2017 at 11:38:50AM -0600, Bjorn Helgaas wrote:
> > > On Wed, Feb 15, 2017 at 11:17:00AM -0600, Rob Herring wrote:
> > > > On Tue, Feb 07, 2017 at 07:50:27AM -0800, Andrey Smirnov wrote:
> > > > > Add various bits of code needed to support i.MX7D variant of the IP.
> > 
> > > > 
> > > > [...]
> > > > 
> > > > > @@ -251,6 +261,10 @@ static void imx6_pcie_assert_core_reset(struct imx6_pcie *imx6_pcie)
> > > > >  	u32 val, gpr1, gpr12;
> > > > >  
> > > > >  	switch (imx6_pcie->variant) {
> > > > > +	case IMX7D:
> > > > > +		reset_control_assert(imx6_pcie->pciephy_reset);
> > > > > +		reset_control_assert(imx6_pcie->apps_reset);
> > > > > +		break;
> > > > >  	case IMX6SX:
> > > > >  		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
> > > > >  				   IMX6SX_GPR12_PCIE_TEST_POWERDOWN,
> > > > 
> > > > So the difference with i.MX7D is not really that it has a reset or not, 
> > > > but some platforms use a reset driver and some do not. The latter should 
> > > > be fixed.
> > > 
> > > I have this patch queued for v4.11.  Are these things that should be
> > > fixed first?  If so, I can drop this.
> > 
> > Well, depends if you trust things will get fixed later and if the PHY 
> > in fact should be separate as that affects the binding. It would affect 
> > how the driver changes are done as instead of "if (IMX7D) ...", you'd 
> > have "if (imx6_pcie->apps_reset) ..." for example. That part depends on
> > how much churn you want there.
> 
> I dropped it for now, not that I don't trust it will get fixed, but it
> sounds like not completely trivial changes and will affect the binding
> as well, so the intermediate state sounds a little messy.

As I pointed out in direct reply to Rob, I honestly think the binding is
fine as is and properly reflects the hardware. But I guess he'll comment
on that, so JFYI.

Regards,
Lucas