linux-kernel - Re: [PATCH V2 2/2] PCI: generic: Add msi

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Date:	Wed, 12 Nov 2014 12:26:49 +0530
From:	Srikanth Thokala <sriku.linux@...il.com>
To:	suravee.suthikulpanit@....com
Cc:	Bjorn Helgaas <bhelgaas@...gle.com>, liviu.dudau@....com,
	lorenzo.pieralisi@....com, will.deacon@....com,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V2 2/2] PCI: generic: Add msi_parent DT binding

Hi,

On Wed, Nov 12, 2014 at 12:47 AM,  <suravee.suthikulpanit@....com> wrote:
> From: Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>
>
> This patch introduces a new DT binding, msi-parent, which can
> be used to specify MSI-parent phandle for a particular PCI
> generic host controller.
>
> Also, it implements and registers set_msi_parent callback.
>
> Cc: Bjorn Helgass <bhelgaas@...gle.com>
> Cc: Liviu Dudau <liviu.dudau@....com>
> Cc: Will Deacon <will.deacon@....com>
> Cc: Lorenzo Pieralisi <lorenzo.pieralisi@....com>
> Signed-off-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>
> ---
>  Documentation/devicetree/bindings/pci/host-generic-pci.txt |  3 +++
>  drivers/pci/host/pci-host-generic.c                        | 13 +++++++++++++
>  2 files changed, 16 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/pci/host-generic-pci.txt b/Documentation/devicetree/bindings/pci/host-generic-pci.txt
> index cf3e205..6996af7 100644
> --- a/Documentation/devicetree/bindings/pci/host-generic-pci.txt
> +++ b/Documentation/devicetree/bindings/pci/host-generic-pci.txt
> @@ -36,6 +36,8 @@ Properties of the host controller node:
>  - reg            : The Configuration Space base address and size, as accessed
>                     from the parent bus.
>
> +- msi-parent     : Specify the phandle of the corresponded MSI controller
> +                   for this PCI host controller.
>
>  Properties of the /chosen node:
>
> @@ -77,6 +79,7 @@ pci {
>      device_type = "pci";
>      #address-cells = <3>;
>      #size-cells = <2>;
> +    msi-parent = <&msictrl0>;
>      bus-range = <0x0 0x1>;
>
>      // CPU_PHYSICAL(2)  SIZE(2)
> diff --git a/drivers/pci/host/pci-host-generic.c b/drivers/pci/host/pci-host-generic.c
> index 1895907..c4fbcda 100644
> --- a/drivers/pci/host/pci-host-generic.c
> +++ b/drivers/pci/host/pci-host-generic.c
> @@ -42,6 +42,7 @@ struct gen_pci {
>         struct pci_host_bridge                  host;
>         struct gen_pci_cfg_windows              cfg;
>         struct list_head                        resources;
> +       struct msi_chip                         *mchip;
>  };
>
>  static void __iomem *gen_pci_map_cfg_bus_cam(struct pci_bus *bus,
> @@ -122,9 +123,19 @@ static int gen_pci_config_write(struct pci_bus *bus, unsigned int devfn,
>         return PCIBIOS_SUCCESSFUL;
>  }
>
> +static int gen_pci_set_msi_parent(struct pci_bus *bus)
> +{
> +       struct gen_pci *pci = bus_to_gen_pci(bus);
> +
> +       bus->msi = pci->mchip;
> +
> +       return PCIBIOS_SUCCESSFUL;
> +}
> +
>  static struct pci_ops gen_pci_ops = {
>         .read   = gen_pci_config_read,
>         .write  = gen_pci_config_write,
> +       .set_msi_parent = gen_pci_set_msi_parent,

We assign the msi chip through add_bus() call, do we still need this?

Srikanth

>  };
>
>  static const struct of_device_id gen_pci_of_match[] = {
> @@ -303,6 +314,8 @@ static int gen_pci_probe(struct platform_device *pdev)
>                 return err;
>         }
>
> +       pci->mchip = of_pci_find_msi_chip_by_node(of_parse_phandle(np,
> +                                                 "msi-parent", 0));
>         pci_common_init_dev(dev, &hw);
>         return 0;
>  }
> --
> 1.9.3
>
> --
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