linux-kernel - Re: [PATCH v4 10/16] dt-bindings: phy: tegra-xusb: Add nvidia,pmc prop

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Message-ID: <4d190cc1-d01d-9064-0b28-ed7f48858ebd@nvidia.com>
Date:   Wed, 28 Oct 2020 17:18:00 +0800
From:   JC Kuo <jckuo@...dia.com>
To:     Rob Herring <robh@...nel.org>, <thierry.reding@...il.com>
CC:     <gregkh@...uxfoundation.org>, <jonathanh@...dia.com>,
        <kishon@...com>, <linux-tegra@...r.kernel.org>,
        <linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <nkristam@...dia.com>
Subject: Re: [PATCH v4 10/16] dt-bindings: phy: tegra-xusb: Add nvidia,pmc
 prop

On 10/20/20 5:40 AM, Rob Herring wrote:
> On Fri, Oct 16, 2020 at 09:07:20PM +0800, JC Kuo wrote:
>> This commit describes the "nvidia,pmc" property for Tegra210 tegra-xusb
>> PHY driver. It is a phandle and specifier referring to the Tegra210
>> pmc@...0e400 node.
>>
>> Signed-off-by: JC Kuo <jckuo@...dia.com>
>> ---
>> v4:
>>    new change to document "nvidia,pmc" prop
>>
>>  .../devicetree/bindings/phy/nvidia,tegra124-xusb-padctl.txt      | 1 +
>>  1 file changed, 1 insertion(+)
>>
>> diff --git a/Documentation/devicetree/bindings/phy/nvidia,tegra124-xusb-padctl.txt b/Documentation/devicetree/bindings/phy/nvidia,tegra124-xusb-padctl.txt
>> index 38c5fa21f435..ea559baeb546 100644
>> --- a/Documentation/devicetree/bindings/phy/nvidia,tegra124-xusb-padctl.txt
>> +++ b/Documentation/devicetree/bindings/phy/nvidia,tegra124-xusb-padctl.txt
>> @@ -54,6 +54,7 @@ For Tegra210:
>>  - avdd-pll-uerefe-supply: PLLE reference PLL power supply. Must supply 1.05 V.
>>  - dvdd-pex-pll-supply: PCIe/USB3 PLL power supply. Must supply 1.05 V.
>>  - hvdd-pex-pll-e-supply: High-voltage PLLE power supply. Must supply 1.8 V.
>> +- nvidia,pmc: phandle and specifier referring to the Tegra210 pmc@...0e400 node.
> 
> 'Tegra210 pmc@...0e400' is kind of specific. Going to update this for 
> every address and chip?
> 
> If there's only one PMC, you can just find the compatible PMC node. Then 
> you don't need a DT update.
> 
> Rob
> 
Hi Rob,
Thanks for your review and suggestion. Yes, there is only one PMC node. You mean
I can retrieve the PMC node with the following code and if do do DT update is
not required, right?

	np = of_find_compatible_node(NULL, NULL, "nvidia,tegra210-pmc");

JC