[PATCH v3 0/2] Skip phy initialization for DWC3 USB Controllers

[PATCH v3 0/2] Skip phy initialization for DWC3 USB Controllers

[Sandeep Maheswaram]

Runtime suspend of phy drivers was failing from DWC3 driver as
runtime usage value is 2 because the phy is initialized from
DWC3 core and HCD core.
Some controllers like DWC3 and CDNS3 manage phy in their core drivers.
This property can be set to avoid phy initialization in HCD core.

v3:
Coming back to this series based on discussion at below thread
https://patchwork.kernel.org/project/linux-arm-msm/patch/1648103831-12347-4-git-send-email-quic_c_sanm@quicinc.com/
Dropped the dt bindings PATCH 1/3 in v2
https://patchwork.kernel.org/project/linux-arm-msm/cover/1636353710-25582-1-git-send-email-quic_c_sanm@quicinc.com/ 

v2:
Updated the commit descriptions.
Changed subject prefix from dwc to dwc3.
Increased props array size.

Sandeep Maheswaram (2):
  usb: host: xhci-plat: Add device property to set XHCI_SKIP_PHY_INIT
    quirk
  usb: dwc3: host: Set the property usb-skip-phy-init

 drivers/usb/dwc3/host.c      | 4 +++-
 drivers/usb/host/xhci-plat.c | 3 +++
 2 files changed, 6 insertions(+), 1 deletion(-)

-- 
2.7.4

[PATCH v3 1/2] usb: host: xhci-plat: Add device property to set XHCI_SKIP_PHY_INIT quirk

[Sandeep Maheswaram]

Add device property usb-skip-phy-init to check and set XHCI_SKIP_PHY_INIT
quirk.
Runtime suspend of phy drivers was failing from DWC3 driver as
runtime usage value is 2 because the phy is initialized from
DWC3 core and HCD core.
Some controllers like DWC3 and CDNS3 manage phy in their core drivers.
This property can be set to avoid phy initialization in HCD core.

Signed-off-by: Sandeep Maheswaram <quic_c_sanm@quicinc.com>
---
 drivers/usb/host/xhci-plat.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c
index 649ffd8..7624ed9 100644
--- a/drivers/usb/host/xhci-plat.c
+++ b/drivers/usb/host/xhci-plat.c
@@ -305,6 +305,9 @@ static int xhci_plat_probe(struct platform_device *pdev)
 		if (device_property_read_bool(tmpdev, "quirk-broken-port-ped"))
 			xhci->quirks |= XHCI_BROKEN_PORT_PED;
 
+		if (device_property_read_bool(tmpdev, "usb-skip-phy-init"))
+			xhci->quirks |= XHCI_SKIP_PHY_INIT;
+
 		device_property_read_u32(tmpdev, "imod-interval-ns",
 					 &xhci->imod_interval);
 	}
-- 
2.7.4

[PATCH v3 2/2] usb: dwc3: host: Set the property usb-skip-phy-init

[Sandeep Maheswaram]

Runtime suspend of phy drivers was failing from DWC3 driver as
runtime usage value is 2 because the phy is initialized from
DWC3 core and HCD core.
Some controllers like DWC3 and CDNS3 manage phy in their core drivers.
This property can be set to avoid phy initialization in HCD core.

Signed-off-by: Sandeep Maheswaram <quic_c_sanm@quicinc.com>
---
 drivers/usb/dwc3/host.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/dwc3/host.c b/drivers/usb/dwc3/host.c
index eda8719..fe810ff 100644
--- a/drivers/usb/dwc3/host.c
+++ b/drivers/usb/dwc3/host.c
@@ -67,7 +67,7 @@ static int dwc3_host_get_irq(struct dwc3 *dwc)
 
 int dwc3_host_init(struct dwc3 *dwc)
 {
-	struct property_entry	props[4];
+	struct property_entry	props[5];
 	struct platform_device	*xhci;
 	int			ret, irq;
 	int			prop_idx = 0;
@@ -114,6 +114,8 @@ int dwc3_host_init(struct dwc3 *dwc)
 	if (DWC3_VER_IS_WITHIN(DWC3, ANY, 300A))
 		props[prop_idx++] = PROPERTY_ENTRY_BOOL("quirk-broken-port-ped");
 
+	props[prop_idx++] = PROPERTY_ENTRY_BOOL("usb-skip-phy-init");
+
 	if (prop_idx) {
 		ret = device_create_managed_software_node(&xhci->dev, props, NULL);
 		if (ret) {
-- 
2.7.4

RE: [PATCH v3 0/2] Skip phy initialization for DWC3 USB Controllers

[Sandeep Maheswaram (Temp) (QUIC)]

Hi Mathias, Felipe,

> -----Original Message-----
> From: Sandeep Maheswaram (Temp) (QUIC) <quic_c_sanm@quicinc.com>
> Sent: Thursday, April 7, 2022 3:01 PM
> To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>; Felipe Balbi
> <balbi@kernel.org>; Stephen Boyd <swboyd@chromium.org>; Doug
> Anderson <dianders@chromium.org>; Matthias Kaehlcke
> <mka@chromium.org>; Mathias Nyman <mathias.nyman@intel.com>
> Cc: linux-arm-msm@vger.kernel.org; linux-usb@vger.kernel.org; linux-
> kernel@vger.kernel.org; Pavan Kumar Kondeti (QUIC)
> <quic_pkondeti@quicinc.com>; Pratham Pratap (QUIC)
> <quic_ppratap@quicinc.com>; Krishna Kurapati PSSNV (QUIC)
> <quic_kriskura@quicinc.com>; Vidya Sagar Pulyala (Temp) (QUIC)
> <quic_vpulyala@quicinc.com>; Sandeep Maheswaram (Temp) (QUIC)
> <quic_c_sanm@quicinc.com>
> Subject: [PATCH v3 0/2] Skip phy initialization for DWC3 USB Controllers
> 
> Runtime suspend of phy drivers was failing from DWC3 driver as runtime
> usage value is 2 because the phy is initialized from
> DWC3 core and HCD core.
> Some controllers like DWC3 and CDNS3 manage phy in their core drivers.
> This property can be set to avoid phy initialization in HCD core.
> 
> v3:
> Coming back to this series based on discussion at below thread
> https://patchwork.kernel.org/project/linux-arm-msm/patch/1648103831-
> 12347-4-git-send-email-quic_c_sanm@quicinc.com/
> Dropped the dt bindings PATCH 1/3 in v2
> https://patchwork.kernel.org/project/linux-arm-msm/cover/1636353710-
> 25582-1-git-send-email-quic_c_sanm@quicinc.com/
> 
> v2:
> Updated the commit descriptions.
> Changed subject prefix from dwc to dwc3.
> Increased props array size.
> 
> Sandeep Maheswaram (2):
>   usb: host: xhci-plat: Add device property to set XHCI_SKIP_PHY_INIT
>     quirk
>   usb: dwc3: host: Set the property usb-skip-phy-init
> 
>  drivers/usb/dwc3/host.c      | 4 +++-
>  drivers/usb/host/xhci-plat.c | 3 +++
>  2 files changed, 6 insertions(+), 1 deletion(-)
> 
> --
> 2.7.4

Please let me know your opinion about this series.

Regards
Sandeep

Re: [PATCH v3 0/2] Skip phy initialization for DWC3 USB Controllers

[Mathias Nyman]

On 19.4.2022 13.17, Sandeep Maheswaram (Temp) (QUIC) wrote:
> Hi Mathias, Felipe,
> 
>> -----Original Message-----
>> From: Sandeep Maheswaram (Temp) (QUIC) <quic_c_sanm@quicinc.com>
>> Sent: Thursday, April 7, 2022 3:01 PM
>> To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>; Felipe Balbi
>> <balbi@kernel.org>; Stephen Boyd <swboyd@chromium.org>; Doug
>> Anderson <dianders@chromium.org>; Matthias Kaehlcke
>> <mka@chromium.org>; Mathias Nyman <mathias.nyman@intel.com>
>> Cc: linux-arm-msm@vger.kernel.org; linux-usb@vger.kernel.org; linux-
>> kernel@vger.kernel.org; Pavan Kumar Kondeti (QUIC)
>> <quic_pkondeti@quicinc.com>; Pratham Pratap (QUIC)
>> <quic_ppratap@quicinc.com>; Krishna Kurapati PSSNV (QUIC)
>> <quic_kriskura@quicinc.com>; Vidya Sagar Pulyala (Temp) (QUIC)
>> <quic_vpulyala@quicinc.com>; Sandeep Maheswaram (Temp) (QUIC)
>> <quic_c_sanm@quicinc.com>
>> Subject: [PATCH v3 0/2] Skip phy initialization for DWC3 USB Controllers
>>
>> Runtime suspend of phy drivers was failing from DWC3 driver as runtime
>> usage value is 2 because the phy is initialized from
>> DWC3 core and HCD core.
>> Some controllers like DWC3 and CDNS3 manage phy in their core drivers.
>> This property can be set to avoid phy initialization in HCD core.
>>
>> v3:
>> Coming back to this series based on discussion at below thread
>> https://patchwork.kernel.org/project/linux-arm-msm/patch/1648103831-
>> 12347-4-git-send-email-quic_c_sanm@quicinc.com/
>> Dropped the dt bindings PATCH 1/3 in v2
>> https://patchwork.kernel.org/project/linux-arm-msm/cover/1636353710-
>> 25582-1-git-send-email-quic_c_sanm@quicinc.com/
>>
>> v2:
>> Updated the commit descriptions.
>> Changed subject prefix from dwc to dwc3.
>> Increased props array size.
>>
>> Sandeep Maheswaram (2):
>>   usb: host: xhci-plat: Add device property to set XHCI_SKIP_PHY_INIT
>>     quirk
>>   usb: dwc3: host: Set the property usb-skip-phy-init
>>
>>  drivers/usb/dwc3/host.c      | 4 +++-
>>  drivers/usb/host/xhci-plat.c | 3 +++
>>  2 files changed, 6 insertions(+), 1 deletion(-)
>>
>> --
>> 2.7.4
> 
> Please let me know your opinion about this series.

Otherwise looks good but wondering if we should document that new device
property somewhere. 

Couldn't find a standard way how those device properties excluded from
Documentation/devicetree/binding are documented

Thanks
-Mathias

Re: [PATCH v3 1/2] usb: host: xhci-plat: Add device property to set XHCI_SKIP_PHY_INIT quirk

[Greg Kroah-Hartman]

On Thu, Apr 07, 2022 at 03:01:27PM +0530, Sandeep Maheswaram wrote:
> Add device property usb-skip-phy-init to check and set XHCI_SKIP_PHY_INIT
> quirk.
> Runtime suspend of phy drivers was failing from DWC3 driver as
> runtime usage value is 2 because the phy is initialized from
> DWC3 core and HCD core.
> Some controllers like DWC3 and CDNS3 manage phy in their core drivers.
> This property can be set to avoid phy initialization in HCD core.
> 
> Signed-off-by: Sandeep Maheswaram <quic_c_sanm@quicinc.com>
> ---
>  drivers/usb/host/xhci-plat.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c
> index 649ffd8..7624ed9 100644
> --- a/drivers/usb/host/xhci-plat.c
> +++ b/drivers/usb/host/xhci-plat.c
> @@ -305,6 +305,9 @@ static int xhci_plat_probe(struct platform_device *pdev)
>  		if (device_property_read_bool(tmpdev, "quirk-broken-port-ped"))
>  			xhci->quirks |= XHCI_BROKEN_PORT_PED;
>  
> +		if (device_property_read_bool(tmpdev, "usb-skip-phy-init"))
> +			xhci->quirks |= XHCI_SKIP_PHY_INIT;

You forgot to document this new property.  Without that, we can not
accept this :(

Re: [PATCH v3 1/2] usb: host: xhci-plat: Add device property to set XHCI_SKIP_PHY_INIT quirk

[Pavan Kondeti]

+Rob Herring

On Wed, Apr 20, 2022 at 05:36:57PM +0200, Greg Kroah-Hartman wrote:
> On Thu, Apr 07, 2022 at 03:01:27PM +0530, Sandeep Maheswaram wrote:
> > Add device property usb-skip-phy-init to check and set XHCI_SKIP_PHY_INIT
> > quirk.
> > Runtime suspend of phy drivers was failing from DWC3 driver as
> > runtime usage value is 2 because the phy is initialized from
> > DWC3 core and HCD core.
> > Some controllers like DWC3 and CDNS3 manage phy in their core drivers.
> > This property can be set to avoid phy initialization in HCD core.
> > 
> > Signed-off-by: Sandeep Maheswaram <quic_c_sanm@quicinc.com>
> > ---
> >  drivers/usb/host/xhci-plat.c | 3 +++
> >  1 file changed, 3 insertions(+)
> > 
> > diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c
> > index 649ffd8..7624ed9 100644
> > --- a/drivers/usb/host/xhci-plat.c
> > +++ b/drivers/usb/host/xhci-plat.c
> > @@ -305,6 +305,9 @@ static int xhci_plat_probe(struct platform_device *pdev)
> >  		if (device_property_read_bool(tmpdev, "quirk-broken-port-ped"))
> >  			xhci->quirks |= XHCI_BROKEN_PORT_PED;
> >  
> > +		if (device_property_read_bool(tmpdev, "usb-skip-phy-init"))
> > +			xhci->quirks |= XHCI_SKIP_PHY_INIT;
> 
> You forgot to document this new property.  Without that, we can not
> accept this :(
> 

Thanks Greg for taking a look. This series has a device tree binding doc
update but got dropped after Rob's comment here.

https://lore.kernel.org/linux-usb/YY7vAzxj9aR%2FzBSB@robh.at.kernel.org/

Sandeep,

Since, we could not come up with a way to limit this to only dwc3/cdns3
controllers, please include the device tree binding doc and re-send the
series.

https://lore.kernel.org/linux-usb/f578947c-fb10-11b7-abe8-28b6b3f6bb0c@linux.intel.com/#t

has all the different options we dicussed and why we went with a dT param
for this.

Thanks,
Pavan

Re: [PATCH v3 0/2] Skip phy initialization for DWC3 USB Controllers

[Heikki Krogerus]

On Wed, Apr 20, 2022 at 04:20:52PM +0300, Mathias Nyman wrote:
> On 19.4.2022 13.17, Sandeep Maheswaram (Temp) (QUIC) wrote:
> > Hi Mathias, Felipe,
> > 
> >> -----Original Message-----
> >> From: Sandeep Maheswaram (Temp) (QUIC) <quic_c_sanm@quicinc.com>
> >> Sent: Thursday, April 7, 2022 3:01 PM
> >> To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>; Felipe Balbi
> >> <balbi@kernel.org>; Stephen Boyd <swboyd@chromium.org>; Doug
> >> Anderson <dianders@chromium.org>; Matthias Kaehlcke
> >> <mka@chromium.org>; Mathias Nyman <mathias.nyman@intel.com>
> >> Cc: linux-arm-msm@vger.kernel.org; linux-usb@vger.kernel.org; linux-
> >> kernel@vger.kernel.org; Pavan Kumar Kondeti (QUIC)
> >> <quic_pkondeti@quicinc.com>; Pratham Pratap (QUIC)
> >> <quic_ppratap@quicinc.com>; Krishna Kurapati PSSNV (QUIC)
> >> <quic_kriskura@quicinc.com>; Vidya Sagar Pulyala (Temp) (QUIC)
> >> <quic_vpulyala@quicinc.com>; Sandeep Maheswaram (Temp) (QUIC)
> >> <quic_c_sanm@quicinc.com>
> >> Subject: [PATCH v3 0/2] Skip phy initialization for DWC3 USB Controllers
> >>
> >> Runtime suspend of phy drivers was failing from DWC3 driver as runtime
> >> usage value is 2 because the phy is initialized from
> >> DWC3 core and HCD core.
> >> Some controllers like DWC3 and CDNS3 manage phy in their core drivers.
> >> This property can be set to avoid phy initialization in HCD core.
> >>
> >> v3:
> >> Coming back to this series based on discussion at below thread
> >> https://patchwork.kernel.org/project/linux-arm-msm/patch/1648103831-
> >> 12347-4-git-send-email-quic_c_sanm@quicinc.com/
> >> Dropped the dt bindings PATCH 1/3 in v2
> >> https://patchwork.kernel.org/project/linux-arm-msm/cover/1636353710-
> >> 25582-1-git-send-email-quic_c_sanm@quicinc.com/
> >>
> >> v2:
> >> Updated the commit descriptions.
> >> Changed subject prefix from dwc to dwc3.
> >> Increased props array size.
> >>
> >> Sandeep Maheswaram (2):
> >>   usb: host: xhci-plat: Add device property to set XHCI_SKIP_PHY_INIT
> >>     quirk
> >>   usb: dwc3: host: Set the property usb-skip-phy-init
> >>
> >>  drivers/usb/dwc3/host.c      | 4 +++-
> >>  drivers/usb/host/xhci-plat.c | 3 +++
> >>  2 files changed, 6 insertions(+), 1 deletion(-)
> >>
> >> --
> >> 2.7.4
> > 
> > Please let me know your opinion about this series.
> 
> Otherwise looks good but wondering if we should document that new device
> property somewhere. 
> 
> Couldn't find a standard way how those device properties excluded from
> Documentation/devicetree/binding are documented

Couldn't it be just documented in drivers/usb/host/xhci-plat.c for now?

thanks,

-- 
heikki

Re: [PATCH v3 0/2] Skip phy initialization for DWC3 USB Controllers

[Greg Kroah-Hartman]

On Thu, Apr 21, 2022 at 10:46:37AM +0300, Heikki Krogerus wrote:
> On Wed, Apr 20, 2022 at 04:20:52PM +0300, Mathias Nyman wrote:
> > On 19.4.2022 13.17, Sandeep Maheswaram (Temp) (QUIC) wrote:
> > > Hi Mathias, Felipe,
> > > 
> > >> -----Original Message-----
> > >> From: Sandeep Maheswaram (Temp) (QUIC) <quic_c_sanm@quicinc.com>
> > >> Sent: Thursday, April 7, 2022 3:01 PM
> > >> To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>; Felipe Balbi
> > >> <balbi@kernel.org>; Stephen Boyd <swboyd@chromium.org>; Doug
> > >> Anderson <dianders@chromium.org>; Matthias Kaehlcke
> > >> <mka@chromium.org>; Mathias Nyman <mathias.nyman@intel.com>
> > >> Cc: linux-arm-msm@vger.kernel.org; linux-usb@vger.kernel.org; linux-
> > >> kernel@vger.kernel.org; Pavan Kumar Kondeti (QUIC)
> > >> <quic_pkondeti@quicinc.com>; Pratham Pratap (QUIC)
> > >> <quic_ppratap@quicinc.com>; Krishna Kurapati PSSNV (QUIC)
> > >> <quic_kriskura@quicinc.com>; Vidya Sagar Pulyala (Temp) (QUIC)
> > >> <quic_vpulyala@quicinc.com>; Sandeep Maheswaram (Temp) (QUIC)
> > >> <quic_c_sanm@quicinc.com>
> > >> Subject: [PATCH v3 0/2] Skip phy initialization for DWC3 USB Controllers
> > >>
> > >> Runtime suspend of phy drivers was failing from DWC3 driver as runtime
> > >> usage value is 2 because the phy is initialized from
> > >> DWC3 core and HCD core.
> > >> Some controllers like DWC3 and CDNS3 manage phy in their core drivers.
> > >> This property can be set to avoid phy initialization in HCD core.
> > >>
> > >> v3:
> > >> Coming back to this series based on discussion at below thread
> > >> https://patchwork.kernel.org/project/linux-arm-msm/patch/1648103831-
> > >> 12347-4-git-send-email-quic_c_sanm@quicinc.com/
> > >> Dropped the dt bindings PATCH 1/3 in v2
> > >> https://patchwork.kernel.org/project/linux-arm-msm/cover/1636353710-
> > >> 25582-1-git-send-email-quic_c_sanm@quicinc.com/
> > >>
> > >> v2:
> > >> Updated the commit descriptions.
> > >> Changed subject prefix from dwc to dwc3.
> > >> Increased props array size.
> > >>
> > >> Sandeep Maheswaram (2):
> > >>   usb: host: xhci-plat: Add device property to set XHCI_SKIP_PHY_INIT
> > >>     quirk
> > >>   usb: dwc3: host: Set the property usb-skip-phy-init
> > >>
> > >>  drivers/usb/dwc3/host.c      | 4 +++-
> > >>  drivers/usb/host/xhci-plat.c | 3 +++
> > >>  2 files changed, 6 insertions(+), 1 deletion(-)
> > >>
> > >> --
> > >> 2.7.4
> > > 
> > > Please let me know your opinion about this series.
> > 
> > Otherwise looks good but wondering if we should document that new device
> > property somewhere. 
> > 
> > Couldn't find a standard way how those device properties excluded from
> > Documentation/devicetree/binding are documented
> 
> Couldn't it be just documented in drivers/usb/host/xhci-plat.c for now?

That's not where DT properties are documented.

Re: [PATCH v3 0/2] Skip phy initialization for DWC3 USB Controllers

[Heikki Krogerus]

On Thu, Apr 21, 2022 at 10:36:57AM +0200, Greg Kroah-Hartman wrote:
> On Thu, Apr 21, 2022 at 10:46:37AM +0300, Heikki Krogerus wrote:
> > On Wed, Apr 20, 2022 at 04:20:52PM +0300, Mathias Nyman wrote:
> > > On 19.4.2022 13.17, Sandeep Maheswaram (Temp) (QUIC) wrote:
> > > > Hi Mathias, Felipe,
> > > > 
> > > >> -----Original Message-----
> > > >> From: Sandeep Maheswaram (Temp) (QUIC) <quic_c_sanm@quicinc.com>
> > > >> Sent: Thursday, April 7, 2022 3:01 PM
> > > >> To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>; Felipe Balbi
> > > >> <balbi@kernel.org>; Stephen Boyd <swboyd@chromium.org>; Doug
> > > >> Anderson <dianders@chromium.org>; Matthias Kaehlcke
> > > >> <mka@chromium.org>; Mathias Nyman <mathias.nyman@intel.com>
> > > >> Cc: linux-arm-msm@vger.kernel.org; linux-usb@vger.kernel.org; linux-
> > > >> kernel@vger.kernel.org; Pavan Kumar Kondeti (QUIC)
> > > >> <quic_pkondeti@quicinc.com>; Pratham Pratap (QUIC)
> > > >> <quic_ppratap@quicinc.com>; Krishna Kurapati PSSNV (QUIC)
> > > >> <quic_kriskura@quicinc.com>; Vidya Sagar Pulyala (Temp) (QUIC)
> > > >> <quic_vpulyala@quicinc.com>; Sandeep Maheswaram (Temp) (QUIC)
> > > >> <quic_c_sanm@quicinc.com>
> > > >> Subject: [PATCH v3 0/2] Skip phy initialization for DWC3 USB Controllers
> > > >>
> > > >> Runtime suspend of phy drivers was failing from DWC3 driver as runtime
> > > >> usage value is 2 because the phy is initialized from
> > > >> DWC3 core and HCD core.
> > > >> Some controllers like DWC3 and CDNS3 manage phy in their core drivers.
> > > >> This property can be set to avoid phy initialization in HCD core.
> > > >>
> > > >> v3:
> > > >> Coming back to this series based on discussion at below thread
> > > >> https://patchwork.kernel.org/project/linux-arm-msm/patch/1648103831-
> > > >> 12347-4-git-send-email-quic_c_sanm@quicinc.com/
> > > >> Dropped the dt bindings PATCH 1/3 in v2
> > > >> https://patchwork.kernel.org/project/linux-arm-msm/cover/1636353710-
> > > >> 25582-1-git-send-email-quic_c_sanm@quicinc.com/
> > > >>
> > > >> v2:
> > > >> Updated the commit descriptions.
> > > >> Changed subject prefix from dwc to dwc3.
> > > >> Increased props array size.
> > > >>
> > > >> Sandeep Maheswaram (2):
> > > >>   usb: host: xhci-plat: Add device property to set XHCI_SKIP_PHY_INIT
> > > >>     quirk
> > > >>   usb: dwc3: host: Set the property usb-skip-phy-init
> > > >>
> > > >>  drivers/usb/dwc3/host.c      | 4 +++-
> > > >>  drivers/usb/host/xhci-plat.c | 3 +++
> > > >>  2 files changed, 6 insertions(+), 1 deletion(-)
> > > >>
> > > >> --
> > > >> 2.7.4
> > > > 
> > > > Please let me know your opinion about this series.
> > > 
> > > Otherwise looks good but wondering if we should document that new device
> > > property somewhere. 
> > > 
> > > Couldn't find a standard way how those device properties excluded from
> > > Documentation/devicetree/binding are documented
> > 
> > Couldn't it be just documented in drivers/usb/host/xhci-plat.c for now?
> 
> That's not where DT properties are documented.

It's not a DT property.

-- 
heikki

Re: [PATCH v3 0/2] Skip phy initialization for DWC3 USB Controllers

[Greg Kroah-Hartman]

On Thu, Apr 21, 2022 at 11:41:33AM +0300, Heikki Krogerus wrote:
> On Thu, Apr 21, 2022 at 10:36:57AM +0200, Greg Kroah-Hartman wrote:
> > On Thu, Apr 21, 2022 at 10:46:37AM +0300, Heikki Krogerus wrote:
> > > On Wed, Apr 20, 2022 at 04:20:52PM +0300, Mathias Nyman wrote:
> > > > On 19.4.2022 13.17, Sandeep Maheswaram (Temp) (QUIC) wrote:
> > > > > Hi Mathias, Felipe,
> > > > > 
> > > > >> -----Original Message-----
> > > > >> From: Sandeep Maheswaram (Temp) (QUIC) <quic_c_sanm@quicinc.com>
> > > > >> Sent: Thursday, April 7, 2022 3:01 PM
> > > > >> To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>; Felipe Balbi
> > > > >> <balbi@kernel.org>; Stephen Boyd <swboyd@chromium.org>; Doug
> > > > >> Anderson <dianders@chromium.org>; Matthias Kaehlcke
> > > > >> <mka@chromium.org>; Mathias Nyman <mathias.nyman@intel.com>
> > > > >> Cc: linux-arm-msm@vger.kernel.org; linux-usb@vger.kernel.org; linux-
> > > > >> kernel@vger.kernel.org; Pavan Kumar Kondeti (QUIC)
> > > > >> <quic_pkondeti@quicinc.com>; Pratham Pratap (QUIC)
> > > > >> <quic_ppratap@quicinc.com>; Krishna Kurapati PSSNV (QUIC)
> > > > >> <quic_kriskura@quicinc.com>; Vidya Sagar Pulyala (Temp) (QUIC)
> > > > >> <quic_vpulyala@quicinc.com>; Sandeep Maheswaram (Temp) (QUIC)
> > > > >> <quic_c_sanm@quicinc.com>
> > > > >> Subject: [PATCH v3 0/2] Skip phy initialization for DWC3 USB Controllers
> > > > >>
> > > > >> Runtime suspend of phy drivers was failing from DWC3 driver as runtime
> > > > >> usage value is 2 because the phy is initialized from
> > > > >> DWC3 core and HCD core.
> > > > >> Some controllers like DWC3 and CDNS3 manage phy in their core drivers.
> > > > >> This property can be set to avoid phy initialization in HCD core.
> > > > >>
> > > > >> v3:
> > > > >> Coming back to this series based on discussion at below thread
> > > > >> https://patchwork.kernel.org/project/linux-arm-msm/patch/1648103831-
> > > > >> 12347-4-git-send-email-quic_c_sanm@quicinc.com/
> > > > >> Dropped the dt bindings PATCH 1/3 in v2
> > > > >> https://patchwork.kernel.org/project/linux-arm-msm/cover/1636353710-
> > > > >> 25582-1-git-send-email-quic_c_sanm@quicinc.com/
> > > > >>
> > > > >> v2:
> > > > >> Updated the commit descriptions.
> > > > >> Changed subject prefix from dwc to dwc3.
> > > > >> Increased props array size.
> > > > >>
> > > > >> Sandeep Maheswaram (2):
> > > > >>   usb: host: xhci-plat: Add device property to set XHCI_SKIP_PHY_INIT
> > > > >>     quirk
> > > > >>   usb: dwc3: host: Set the property usb-skip-phy-init
> > > > >>
> > > > >>  drivers/usb/dwc3/host.c      | 4 +++-
> > > > >>  drivers/usb/host/xhci-plat.c | 3 +++
> > > > >>  2 files changed, 6 insertions(+), 1 deletion(-)
> > > > >>
> > > > >> --
> > > > >> 2.7.4
> > > > > 
> > > > > Please let me know your opinion about this series.
> > > > 
> > > > Otherwise looks good but wondering if we should document that new device
> > > > property somewhere. 
> > > > 
> > > > Couldn't find a standard way how those device properties excluded from
> > > > Documentation/devicetree/binding are documented
> > > 
> > > Couldn't it be just documented in drivers/usb/host/xhci-plat.c for now?
> > 
> > That's not where DT properties are documented.
> 
> It's not a DT property.

Then what is it and why are the other properties documented?

Anyway, a new series has been submitted that does document this so I
don't think it's an argument anymore :)