linux-kernel - Re: [PATCH V2 1/5] dt-bindings: usb: xhci-tegra: Add power-domain details

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Date:   Fri, 12 Oct 2018 08:36:11 +0100
From:   Jon Hunter <jonathanh@...dia.com>
To:     Thierry Reding <thierry.reding@...il.com>
CC:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Mathias Nyman <mathias.nyman@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-tegra@...r.kernel.org>, Ulf Hansson <ulf.hansson@...aro.org>
Subject: Re: [PATCH V2 1/5] dt-bindings: usb: xhci-tegra: Add power-domain
 details


On 11/10/18 17:49, Thierry Reding wrote:
> On Fri, Sep 28, 2018 at 03:11:46PM +0100, Jon Hunter wrote:
>> Add details for power-domains to the Tegra xHCI bindings so that
>> generic power-domains can be used for inconjunction with the xHCI
>> driver.
>>
>> Signed-off-by: Jon Hunter <jonathanh@...dia.com>
>> ---
>>  Documentation/devicetree/bindings/usb/nvidia,tegra124-xusb.txt | 8 ++++++++
>>  1 file changed, 8 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/usb/nvidia,tegra124-xusb.txt b/Documentation/devicetree/bindings/usb/nvidia,tegra124-xusb.txt
>> index 3eee9e505400..4156c3e181c5 100644
>> --- a/Documentation/devicetree/bindings/usb/nvidia,tegra124-xusb.txt
>> +++ b/Documentation/devicetree/bindings/usb/nvidia,tegra124-xusb.txt
>> @@ -59,6 +59,14 @@ 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.
>> +- power-domains: A list of PM domain specifiers that reference each power-domain
>> +  used by the xHCI controller. This list must comprise of a specifier for the
>> +  XUSBA and XUSBC power-domains. See ../power/power_domain.txt and
>> +  ../arm/tegra/nvidia,tegra20-pmc.txt for details.
>> +- power-domain-names: A list of names that represent each of the specifiers in
>> +  the 'power-domains' property. Must include 'xusb_ss' and 'xusb_host' which
> 
> Total bike-shed comment: maybe call these "superspeed" and "host" or
> something. The xusb_ prefix is kind of redundent because of the context.
> On the other hand, those are the names by which the power partitions are
> referred to, so either way:

I choose these names because they align with what we already have for
clocks ...

- clock-names: Must include the following entries:
   - xusb_host
   - xusb_host_src
   - xusb_falcon_src
   - xusb_ss
   - xusb_ss_src
   - xusb_ss_div2
   - xusb_hs_src
   - xusb_fs_src
   - pll_u_480m
   - clk_m
   - pll_e

However, I don't have a strong preference.

> Acked-by: Thierry Reding <treding@...dia.com>

Thanks!
Jon

-- 
nvpublic