linux-kernel - Re: [PATCH 28/37] dt-bindings: PCI: dra7xx: Add dt bindings for pci dra7xx EP mode

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Message-ID: <20170118214505.5kcoowi4ooy7eepg@rob-hp-laptop>
Date:   Wed, 18 Jan 2017 15:45:05 -0600
From:   Rob Herring <robh@...nel.org>
To:     Kishon Vijay Abraham I <kishon@...com>
Cc:     Bjorn Helgaas <bhelgaas@...gle.com>,
        Jingoo Han <jingoohan1@...il.com>,
        Joao Pinto <Joao.Pinto@...opsys.com>,
        Arnd Bergmann <arnd@...db.de>, linux-pci@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, linux-omap@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-arm-kernel@...s.com, linux-arm-msm@...r.kernel.org,
        nsekhar@...com
Subject: Re: [PATCH 28/37] dt-bindings: PCI: dra7xx: Add dt bindings for pci
 dra7xx EP mode

On Thu, Jan 12, 2017 at 03:56:17PM +0530, Kishon Vijay Abraham I wrote:
> Add device tree binding documentation for pci dra7xx EP mode.
> 
> Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
> ---
>  Documentation/devicetree/bindings/pci/ti-pci.txt |   37 ++++++++++++++++++----
>  1 file changed, 30 insertions(+), 7 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/pci/ti-pci.txt b/Documentation/devicetree/bindings/pci/ti-pci.txt
> index 60e2516..62f5f59 100644
> --- a/Documentation/devicetree/bindings/pci/ti-pci.txt
> +++ b/Documentation/devicetree/bindings/pci/ti-pci.txt
> @@ -1,17 +1,22 @@
>  TI PCI Controllers
>  
>  PCIe Designware Controller
> - - compatible: Should be "ti,dra7-pcie""
> - - reg : Two register ranges as listed in the reg-names property
> - - reg-names : The first entry must be "ti-conf" for the TI specific registers
> -	       The second entry must be "rc-dbics" for the designware pcie
> -	       registers
> -	       The third entry must be "config" for the PCIe configuration space
> + - compatible: Should be "ti,dra7-pcie" for RC
> +	       Should be "ti,dra7-pcie-ep" for EP
>   - phys : list of PHY specifiers (used by generic PHY framework)
>   - phy-names : must be "pcie-phy0", "pcie-phy1", "pcie-phyN".. based on the
>  	       number of PHYs as specified in *phys* property.
>   - ti,hwmods : Name of the hwmod associated to the pcie, "pcie<X>",
>  	       where <X> is the instance number of the pcie from the HW spec.
> + - num-lanes as specified in ../designware-pcie.txt
> +
> +HOST MODE
> +=========
> + - reg : Two register ranges as listed in the reg-names property
> + - reg-names : The first entry must be "ti-conf" for the TI specific registers
> +	       The second entry must be "rc-dbics" for the designware pcie
> +	       registers
> +	       The third entry must be "config" for the PCIe configuration space
>   - interrupts : Two interrupt entries must be specified. The first one is for
>  		main interrupt line and the second for MSI interrupt line.
>   - #address-cells,
> @@ -19,13 +24,31 @@ PCIe Designware Controller
>     #interrupt-cells,
>     device_type,
>     ranges,
> -   num-lanes,
>     interrupt-map-mask,
>     interrupt-map : as specified in ../designware-pcie.txt
>  
> +DEVICE MODE
> +===========
> + - reg : Four register ranges as listed in the reg-names property
> + - reg-names : "ti-conf" for the TI specific registers
> +	       "ep_dbics" for the standard configuration registers as
> +		they are locally accessed within the DIF CS space
> +	       "ep_dbics2" for the standard configuration registers as
> +		they are locally accessed within the DIF CS2 space
> +	       "addr_space" used to map remote RC address space
> + - interrupts : one interrupt entries must be specified for main interrupt.
> + - num-ib-windows : number of inbound address translation windows
> + - num-ob-windows : number of outbound address translation windows
> +
>  Optional Property:
>   - gpios : Should be added if a gpio line is required to drive PERST# line
>  
> +NOTE: Two dt nodes should be added for each PCI controller; one for host

s/should/may/

Don't define dts source structure here. You could also have 2 files with 
each config and just include the right one for each board.

We don't want overlapping memory regions defined in DT and this kind of 
violates that, but I guess status is sufficient.

With that,

Acked-by: Rob Herring <robh@...nel.org>

> +mode and another for device mode. So in order for PCI to
> +work in host mode, EP mode dt node should be disabled and in order to PCI to
> +work in EP mode, host mode dt node should be disabled. And host mode and EP
> +mode are mutually exclusive.
> +
>  Example:
>  axi {
>  	compatible = "simple-bus";
> -- 
> 1.7.9.5
> 
> --
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