Re: [PATCH v3 3/6] DT: PCI: qcom: Document PCIe devicetree bindings

[Bjorn Andersson <bjorn.andersson@sonymobile.com>]

On Mon 23 Nov 01:29 PST 2015, Stanimir Varbanov wrote:

> From: Stanimir Varbanov <svarbanov@mm-sol.com>
> 
> Document Qualcomm PCIe driver devicetree bindings.
> 
> Signed-off-by: Stanimir Varbanov <svarbanov@mm-sol.com>
> Signed-off-by: Stanimir Varbanov <stanimir.varbanov@linaro.org>
> ---
>  .../devicetree/bindings/pci/qcom,pcie.txt          |  231 ++++++++++++++++++++
>  1 file changed, 231 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/pci/qcom,pcie.txt
> 
> diff --git a/Documentation/devicetree/bindings/pci/qcom,pcie.txt b/Documentation/devicetree/bindings/pci/qcom,pcie.txt
> new file mode 100644
> index 000000000000..d7640d45fa31
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pci/qcom,pcie.txt
> @@ -0,0 +1,231 @@
> +* Qualcomm PCI express root complex
> +
> +- compatible:
> +	Usage: required
> +	Value type: <stringlist>
> +	Definition: Value shall include
> +		    - "qcom,pcie-v0" for apq/ipq8064
> +		    - "qcom,pcie-v1" for apq8084

Do you know if we have the same v1 of this block in 8994?

[..]
> +- clock-names:
> +	Usage: required
> +	Value type: <stringlist>
> +	Definition: Should contain the following entries
> +		    * should be populated for v0 and v1
> +		    	- "iface"      Configuration AHB clock
> +
> +		    * should be populated for v0
> +		    	- "core"       Clocks the pcie hw block
> +		    	- "phy"        Clocks the pcie PHY block
> +
> +		    * should be populated for v1
> +			- "aux"        Auxiliary (AUX) clock
> +		    	- "bus_master" Master AXI clock
> +		    	- "bus_slave"  Slave AXI clock

You have white spaces among your tabs here.

[..]
> +- <name>-supply:
> +	Usage: required
> +	Value type: <phandle>
> +	Definition: List of phandles to the power supply regulator(s)
> +		    * should be populated for v0 and v1
> +			- "vdda"        core analog power supply
> +
> +		    * should be populated for v0
> +			- "vdda_phy"    analog power supply for PHY
> +			- "vdda_refclk" analog power supply for IC which generate
> +					reference clock

Exploding these into 3 different property descriptions would make it
easier to read, and you can say "required for v0" for the latter
two and simply "required" on the vdda.

[..]
> +- <name>-gpio:
> +	Usage: optional
> +	Value type: <prop-encoded-array>
> +	Definition: List of phandle and gpio specifier pairs. Should contain
> +		    - "perst"  PCIe endpoint reset signal line
> +		    - "pewake" PCIe endpoint wake signal line

This property should be pluralized, i.e. it's <name>-gpios.

Are these identifiers coming from some data sheet? Or could we simply
name them "reset" and "wakeup"?

> +
> +- pinctrl-0:
> +	Usage: required
> +	Value type: <phandle>
> +	Definition: List of phandles pointing at a pin(s) configuration

This is not required and as it's a property applicable to all devices we
normally don't mention them.

> +
> +- pinctrl-names
> +	Usage: required
> +	Value type: <stringlist>
> +	Definition: List of names of pinctrl-0 state
> +

dito

Regards,
Bjorn