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Re: [PATCH v0 06/10] arm: orion5x: Add DT-based support for Netgear WNR854T

From Arnd Bergmann <arnd@arndb.de>
Newsgroups linux.kernel
Subject Re: [PATCH v0 06/10] arm: orion5x: Add DT-based support for Netgear WNR854T
Date 2016-07-18 12:10 +0200
Message-ID <rWdES-4PX-21@gated-at.bofh.it> (permalink)
References <rVzo5-5n4-3@gated-at.bofh.it> <rW1aF-5mY-3@gated-at.bofh.it> <rWdlw-4u2-7@gated-at.bofh.it>
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On Monday, July 18, 2016 11:44:24 AM CEST Thomas Petazzoni wrote:
> 
> On Sun, 17 Jul 2016 22:41:35 +0200, Arnd Bergmann wrote:
> 
> > I would assume that the PCIe port should work out of the box with the driver
> 
> Unfortunately, no. The PCIe on Orion5x requires a workaround for
> reading/writing the PCI configuration space. Instead of doing MMIO
> accesses to PCIE_CONF_ADDR_OFF / PCIE_CONF_DATA_OFF, you must map a
> MBus window, which provides a memory-mapped view of the PCI
> configuration space.
> 
> Definitely not impossible to implement, but the driver doesn't work
> as-is.

Ok.

> > We also don't seem to need any MBUS window setup for the I/O and
> > memory spaces, which greatly simplifies the driver compared to the
> > pci-mvebu one, it would be a fairly straightforward implementation
> > based on pci-host-generic.c (which unfortunately just got way
> > more complicated and might need to go on a diet).
> 
> MBus windows are needed. See:
> 
>         mvebu_mbus_add_window_remap_by_id(ORION_MBUS_PCI_IO_TARGET,
>                                           ORION_MBUS_PCI_IO_ATTR,
>                                           ORION5X_PCI_IO_PHYS_BASE,
>                                           ORION5X_PCI_IO_SIZE,
>                                           ORION5X_PCI_IO_BUS_BASE);
>         mvebu_mbus_add_window_by_id(ORION_MBUS_PCI_MEM_TARGET,
>                                     ORION_MBUS_PCI_MEM_ATTR,
>                                     ORION5X_PCI_MEM_PHYS_BASE,
>                                     ORION5X_PCI_MEM_SIZE);
> 
> in orion5x_setup_wins().

Ok, I was just looking at the wrong file, as they are set up from
common.c, not pci.c.

> Note that we already have some Orion5x converted to DT, and that use
> PCI: board-rd88f5182.c is an example. So we could very well take Jamie
> patches as-is, and move later to a DT-representation for PCI/PCIe.

Ah, I thought all the DT users were moved to mach-mvebu. I agree
this new patch isn't introducing anything we don't already have then,
so we can just take it, but the conversion will not be nice when
we do that.

I was also hoping that we could get to the point where pci_common_init()
is only used for legacy machines without DT and without multiplatform,
it seems I missed a couple of users here.

	Arnd

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[PATCH v0 00/10] Convert Netgear WNR854T to devicetree Jamie Lentin <jm@lentin.co.uk> - 2016-07-16 17:10 +0200
  [PATCH v0 09/10] net: phy: Re-attempt custom DT configuration after configuration Jamie Lentin <jm@lentin.co.uk> - 2016-07-16 17:10 +0200
    Re: [PATCH v0 09/10] net: phy: Re-attempt custom DT configuration  after configuration Andrew Lunn <andrew@lunn.ch> - 2016-07-16 18:50 +0200
  [PATCH v0 03/10] arm: orion5x: Add clk support for mv88f5181 Jamie Lentin <jm@lentin.co.uk> - 2016-07-16 17:10 +0200
    Re: [PATCH v0 03/10] arm: orion5x: Add clk support for mv88f5181 Andrew Lunn <andrew@lunn.ch> - 2016-07-16 18:20 +0200
    Re: [PATCH v0 03/10] arm: orion5x: Add clk support for mv88f5181 Sergei Shtylyov <sergei.shtylyov@cogentembedded.com> - 2016-07-16 19:40 +0200
    Re: [PATCH v0 03/10] arm: orion5x: Add clk support for mv88f5181 Rob Herring <robh@kernel.org> - 2016-07-17 22:40 +0200
  [PATCH v0 01/10] arm: orion5x: Add required properties for orion-wdt to DT node Jamie Lentin <jm@lentin.co.uk> - 2016-07-16 17:10 +0200
    Re: [PATCH v0 01/10] arm: orion5x: Add required properties for  orion-wdt to DT node Andrew Lunn <andrew@lunn.ch> - 2016-07-16 18:10 +0200
  [PATCH v0 10/10] arm: orion5x: Configure Netgear WNR854T network port LEDs Jamie Lentin <jm@lentin.co.uk> - 2016-07-16 17:10 +0200
  [PATCH v0 06/10] arm: orion5x: Add DT-based support for Netgear WNR854T Jamie Lentin <jm@lentin.co.uk> - 2016-07-16 17:10 +0200
    Re: [PATCH v0 06/10] arm: orion5x: Add DT-based support for Netgear  WNR854T Andrew Lunn <andrew@lunn.ch> - 2016-07-16 18:40 +0200
    Re: [PATCH v0 06/10] arm: orion5x: Add DT-based support for Netgear  WNR854T Andrew Lunn <andrew@lunn.ch> - 2016-07-16 18:40 +0200
    Re: [PATCH v0 06/10] arm: orion5x: Add DT-based support for Netgear WNR854T Arnd Bergmann <arnd@arndb.de> - 2016-07-16 21:20 +0200
      Re: [PATCH v0 06/10] arm: orion5x: Add DT-based support for Netgear  WNR854T Jamie Lentin <jm@lentin.co.uk> - 2016-07-17 12:10 +0200
        Re: [PATCH v0 06/10] arm: orion5x: Add DT-based support for Netgear WNR854T Arnd Bergmann <arnd@arndb.de> - 2016-07-17 22:50 +0200
          Re: [PATCH v0 06/10] arm: orion5x: Add DT-based support for Netgear  WNR854T Thomas Petazzoni <thomas.petazzoni@free-electrons.com> - 2016-07-18 11:50 +0200
            Re: [PATCH v0 06/10] arm: orion5x: Add DT-based support for Netgear WNR854T Arnd Bergmann <arnd@arndb.de> - 2016-07-18 12:10 +0200
              Re: [PATCH v0 06/10] arm: orion5x: Add DT-based support for Netgear WNR854T Arnd Bergmann <arnd@arndb.de> - 2016-07-19 11:50 +0200
              Re: [PATCH v0 06/10] arm: orion5x: Add DT-based support for Netgear  WNR854T Jamie Lentin <jm@lentin.co.uk> - 2016-07-19 12:10 +0200
    Re: [PATCH v0 06/10] arm: orion5x: Add DT-based support for Netgear  WNR854T Rob Herring <robh@kernel.org> - 2016-07-17 23:00 +0200
      Re: [PATCH v0 06/10] arm: orion5x: Add DT-based support for Netgear  WNR854T Jamie Lentin <jm@lentin.co.uk> - 2016-07-19 11:50 +0200
  [PATCH v0 07/10] arm: orion5x: Remove old non-DT-based WNR854T support Jamie Lentin <jm@lentin.co.uk> - 2016-07-16 17:10 +0200
    Re: [PATCH v0 07/10] arm: orion5x: Remove old non-DT-based WNR854T  support Andrew Lunn <andrew@lunn.ch> - 2016-07-16 18:40 +0200
  [PATCH v0 04/10] arm: orion5x: Generalise mv88f5181l pinctrl support for 88f5181 Jamie Lentin <jm@lentin.co.uk> - 2016-07-16 17:10 +0200
    Re: [PATCH v0 04/10] arm: orion5x: Generalise mv88f5181l pinctrl  support for 88f5181 Andrew Lunn <andrew@lunn.ch> - 2016-07-16 18:20 +0200
    Re: [PATCH v0 04/10] arm: orion5x: Generalise mv88f5181l pinctrl  support for 88f5181 Rob Herring <robh@kernel.org> - 2016-07-17 22:50 +0200

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