linux-kernel - Re: [PATCH V5 10/16] dt-bindings: PCI: tegra: Add device tree support for T194

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Date:   Tue, 7 May 2019 14:56:19 +0530
From:   Vidya Sagar <vidyas@...dia.com>
To:     Thierry Reding <thierry.reding@...il.com>
CC:     <lorenzo.pieralisi@....com>, <bhelgaas@...gle.com>,
        <robh+dt@...nel.org>, <mark.rutland@....com>,
        <jonathanh@...dia.com>, <kishon@...com>, <catalin.marinas@....com>,
        <will.deacon@....com>, <jingoohan1@...il.com>,
        <gustavo.pimentel@...opsys.com>, <mperttunen@...dia.com>,
        <linux-pci@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-tegra@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <kthota@...dia.com>,
        <mmaddireddy@...dia.com>, <sagar.tv@...il.com>
Subject: Re: [PATCH V5 10/16] dt-bindings: PCI: tegra: Add device tree support
 for T194

On 5/3/2019 4:49 PM, Thierry Reding wrote:
> On Wed, Apr 24, 2019 at 10:49:58AM +0530, Vidya Sagar wrote:
>> Add support for Tegra194 PCIe controllers. These controllers are based
>> on Synopsys DesignWare core IP.
>>
>> Signed-off-by: Vidya Sagar <vidyas@...dia.com>
>> ---
>> Changes since [v4]:
>> * None
>>
>> Changes since [v3]:
>> * None
>>
>> Changes since [v2]:
>> * Using only 'Cx' (x-being controller number) format to represent a controller
>> * Changed to 'value: description' format where applicable
>> * Changed 'nvidia,init-speed' to 'nvidia,init-link-speed'
>> * Provided more documentation for 'nvidia,init-link-speed' property
>> * Changed 'nvidia,pex-wake' to 'nvidia,wake-gpios'
>>
>> Changes since [v1]:
>> * Added documentation for 'power-domains' property
>> * Removed 'window1' and 'window2' properties
>> * Removed '_clk' and '_rst' from clock and reset names
>> * Dropped 'pcie' from phy-names
>> * Added entry for BPMP-FW handle
>> * Removed offsets for some of the registers and added them in code and would be pickedup based on
>>    controller ID
>> * Changed 'nvidia,max-speed' to 'max-link-speed' and is made as an optional
>> * Changed 'nvidia,disable-clock-request' to 'supports-clkreq' with inverted operation
>> * Added more documentation for 'nvidia,update-fc-fixup' property
>> * Removed 'nvidia,enable-power-down' and 'nvidia,plat-gpios' properties
>> * Added '-us' to all properties that represent time in microseconds
>> * Moved P2U documentation to a separate file
>>
>>   .../bindings/pci/nvidia,tegra194-pcie.txt     | 187 ++++++++++++++++++
>>   1 file changed, 187 insertions(+)
>>   create mode 100644 Documentation/devicetree/bindings/pci/nvidia,tegra194-pcie.txt
>>
>> diff --git a/Documentation/devicetree/bindings/pci/nvidia,tegra194-pcie.txt b/Documentation/devicetree/bindings/pci/nvidia,tegra194-pcie.txt
>> new file mode 100644
>> index 000000000000..208dff126108
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/pci/nvidia,tegra194-pcie.txt
>> @@ -0,0 +1,187 @@
>> +NVIDIA Tegra PCIe controller (Synopsys DesignWare Core based)
>> +
>> +This PCIe host controller is based on the Synopsis Designware PCIe IP
>> +and thus inherits all the common properties defined in designware-pcie.txt.
>> +
>> +Required properties:
>> +- compatible: For Tegra19x, must contain "nvidia,tegra194-pcie".
>> +- device_type: Must be "pci"
>> +- power-domains: A phandle to the node that controls power to the respective
>> +  PCIe controller and a specifier name for the PCIe controller. Following are
>> +  the specifiers for the different PCIe controllers
>> +    TEGRA194_POWER_DOMAIN_PCIEX8B: C0
>> +    TEGRA194_POWER_DOMAIN_PCIEX1A: C1
>> +    TEGRA194_POWER_DOMAIN_PCIEX1A: C2
>> +    TEGRA194_POWER_DOMAIN_PCIEX1A: C3
>> +    TEGRA194_POWER_DOMAIN_PCIEX4A: C4
>> +    TEGRA194_POWER_DOMAIN_PCIEX8A: C5
>> +  these specifiers are defined in
>> +  "include/dt-bindings/power/tegra194-powergate.h" file.
>> +- reg: A list of physical base address and length for each set of controller
> 
> Perhaps "list of physical base address and length pairs".
Ok.

> 
>> +  registers. Must contain an entry for each entry in the reg-names property.
>> +- reg-names: Must include the following entries:
>> +  "appl": Controller's application logic registers
>> +  "config": As per the definition in designware-pcie.txt
>> +  "atu_dma": iATU and DMA registers. This is where the iATU (internal Address
>> +             Translation Unit) registers of the PCIe core are made available
>> +             fow SW access.
> 
> s/fow/for/
Done.

> 
> Thierry
>