Re: [PATCH 1/7] ARM: tegra: finalize USB EHCI and PHY bindings
From: Stephen Warren
Date: Wed Mar 20 2013 - 13:30:28 EST
On 03/20/2013 06:15 AM, Venu Byravarasu wrote:
>> -----Original Message-----
>> From: kishon [mailto:kishon@xxxxxx]
>> Sent: Wednesday, March 20, 2013 4:49 PM
>> To: Venu Byravarasu
>> Cc: gregkh@xxxxxxxxxxxxxxxxxxx; stern@xxxxxxxxxxxxxxxxxxx;
>> balbi@xxxxxx; linux-usb@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx;
>> swarren@xxxxxxxxxxxxx; linux-tegra@xxxxxxxxxxxxxxx; devicetree-
>> Subject: Re: [PATCH 1/7] ARM: tegra: finalize USB EHCI and PHY bindings
>> On Monday 18 March 2013 05:59 PM, Venu Byravarasu wrote:
>>> The existing Tegra USB bindings have a few issues:
>>> 1) Many properties are documented as being part of the EHCI controller
>>> node, yet they apply more to the PHY device. They should be moved.
>>> 2) Some registers in PHY1 are shared with PHY3, and hence PHY3 needs a
>>> reg entry to point at PHY1's register space. We can't assume the PHY1
>>> driver is present, so the PHY3 driver will directly access those
>>> 3) The list of clocks required by the PHY was missing some required
>>> This patch fixes the binding definition to resolve these issues.
>>> Signed-off-by: Venu Byravarasu <vbyravarasu@xxxxxxxxxx>
>>> .../bindings/usb/nvidia,tegra20-ehci.txt | 27 +++----------------
>>> .../bindings/usb/nvidia,tegra20-usb-phy.txt | 27
>>> 2 files changed, 29 insertions(+), 25 deletions(-)
>>> diff --git a/Documentation/devicetree/bindings/usb/nvidia,tegra20-ehci.txt
>>> index 34c9528..df09330 100644
>>> --- a/Documentation/devicetree/bindings/usb/nvidia,tegra20-ehci.txt
>>> +++ b/Documentation/devicetree/bindings/usb/nvidia,tegra20-ehci.txt
>>> @@ -6,27 +6,10 @@ Practice : Universal Serial Bus" with the following
>>> and additions :
>>> Required properties :
>>> - - compatible : Should be "nvidia,tegra20-ehci" for USB controllers
>>> - used in host mode.
>>> - - phy_type : Should be one of "ulpi" or "utmi".
>>> Optional properties:
>>> - - dr_mode : dual role mode. Indicates the working mode for
>>> index 6bdaba2..7ceccd3 100644
>>> --- a/Documentation/devicetree/bindings/usb/nvidia,tegra20-usb-phy.txt
>>> +++ b/Documentation/devicetree/bindings/usb/nvidia,tegra20-usb-phy.txt
>>> @@ -4,8 +4,24 @@ The device node for Tegra SOC USB PHY:
>>> Required properties :
>>> + - phy_type : Should be one of "utmi", "ulpi" or "hsic".
>> dt property names generally dont have "_".
> Thanks Kishon, for your comments.
> Is it mandatory or optional?
> If it is mandatory, then I might have to change dr_mode as well along with phy_type.
This rule is basically mandatory for *new* property definitions.
However, both phy_type and dr_mode are properties that already exist and
have historical precedence for their naming. So, I don't think we can
change them. In fact, IIRC, someone even posted some patches to provide
a common set of parsing functions for those properties, and I assume
those patches use the existing names with _ in them. The patches aren't
applied yet though, I think.
(Venu, we already discussed this rule downstream)
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