[PATCH v2] phy: tegra: depend on COMMON_CLK to fix compile tests

[PATCH v2] phy: tegra: depend on COMMON_CLK to fix compile tests

[Krzysztof Kozlowski]

From: Krzysztof Kozlowski <krzk@kernel.org>

The Tegra USB PHY driver uses Common Clock Framework thus it cannot be
built on platforms without it (e.g. compile test on MIPS with RALINK and
SOC_RT305X):

    /usr/bin/mips-linux-gnu-ld: drivers/usb/phy/phy-tegra-usb.o: in function `tegra_usb_phy_init':
    phy-tegra-usb.c:(.text+0x1dd4): undefined reference to `clk_get_parent'

Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>

---

Changes since v1:
1. Depend on COMMON_CLK always, not only for compile test.
---
 drivers/usb/phy/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/usb/phy/Kconfig b/drivers/usb/phy/Kconfig
index 52eebcb88c1f..7500e77a7d01 100644
--- a/drivers/usb/phy/Kconfig
+++ b/drivers/usb/phy/Kconfig
@@ -163,6 +163,7 @@ config USB_MXS_PHY
 config USB_TEGRA_PHY
 	tristate "NVIDIA Tegra USB PHY Driver"
 	depends on ARCH_TEGRA || COMPILE_TEST
+	depends on COMMON_CLK
 	select USB_COMMON
 	select USB_PHY
 	select USB_ULPI
-- 
2.25.1

Re: [PATCH v2] phy: tegra: depend on COMMON_CLK to fix compile tests

[Dmitry Osipenko]

16.03.2021 10:55, Krzysztof Kozlowski пишет:
> From: Krzysztof Kozlowski <krzk@kernel.org>
> 
> The Tegra USB PHY driver uses Common Clock Framework thus it cannot be
> built on platforms without it (e.g. compile test on MIPS with RALINK and
> SOC_RT305X):
> 
>     /usr/bin/mips-linux-gnu-ld: drivers/usb/phy/phy-tegra-usb.o: in function `tegra_usb_phy_init':
>     phy-tegra-usb.c:(.text+0x1dd4): undefined reference to `clk_get_parent'
> 
> Reported-by: kernel test robot <lkp@intel.com>
> Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
> 
> ---
> 
> Changes since v1:
> 1. Depend on COMMON_CLK always, not only for compile test.
> ---
>  drivers/usb/phy/Kconfig | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/usb/phy/Kconfig b/drivers/usb/phy/Kconfig
> index 52eebcb88c1f..7500e77a7d01 100644
> --- a/drivers/usb/phy/Kconfig
> +++ b/drivers/usb/phy/Kconfig
> @@ -163,6 +163,7 @@ config USB_MXS_PHY
>  config USB_TEGRA_PHY
>  	tristate "NVIDIA Tegra USB PHY Driver"
>  	depends on ARCH_TEGRA || COMPILE_TEST
> +	depends on COMMON_CLK
>  	select USB_COMMON
>  	select USB_PHY
>  	select USB_ULPI
> 

But if COMMON_CLK is disabled, then include/linux/clk.h provides a stub
for clk_get_parent(), meaning that MIPS has its own COMMON_CLK, no?

Re: [PATCH v2] phy: tegra: depend on COMMON_CLK to fix compile tests

[Krzysztof Kozlowski]

On Tue, 16 Mar 2021 at 16:43, Dmitry Osipenko <digetx@gmail.com> wrote:
>
> 16.03.2021 10:55, Krzysztof Kozlowski пишет:
> > From: Krzysztof Kozlowski <krzk@kernel.org>
> >
> > The Tegra USB PHY driver uses Common Clock Framework thus it cannot be
> > built on platforms without it (e.g. compile test on MIPS with RALINK and
> > SOC_RT305X):
> >
> >     /usr/bin/mips-linux-gnu-ld: drivers/usb/phy/phy-tegra-usb.o: in function `tegra_usb_phy_init':
> >     phy-tegra-usb.c:(.text+0x1dd4): undefined reference to `clk_get_parent'
> >
> > Reported-by: kernel test robot <lkp@intel.com>
> > Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
> >
> > ---
> >
> > Changes since v1:
> > 1. Depend on COMMON_CLK always, not only for compile test.
> > ---
> >  drivers/usb/phy/Kconfig | 1 +
> >  1 file changed, 1 insertion(+)
> >
> > diff --git a/drivers/usb/phy/Kconfig b/drivers/usb/phy/Kconfig
> > index 52eebcb88c1f..7500e77a7d01 100644
> > --- a/drivers/usb/phy/Kconfig
> > +++ b/drivers/usb/phy/Kconfig
> > @@ -163,6 +163,7 @@ config USB_MXS_PHY
> >  config USB_TEGRA_PHY
> >       tristate "NVIDIA Tegra USB PHY Driver"
> >       depends on ARCH_TEGRA || COMPILE_TEST
> > +     depends on COMMON_CLK
> >       select USB_COMMON
> >       select USB_PHY
> >       select USB_ULPI
> >
>
> But if COMMON_CLK is disabled, then include/linux/clk.h provides a stub
> for clk_get_parent(), meaning that MIPS has its own COMMON_CLK, no?

Hi,

It depends on the platform. Not all of them implement every clk API,
so you can have failures:
https://lore.kernel.org/lkml/202102170017.MgPVy7aZ-lkp@intel.com/

Best regards,
Krzysztof

Re: [PATCH v2] phy: tegra: depend on COMMON_CLK to fix compile tests

[Krzysztof Kozlowski]

On Tue, 16 Mar 2021 at 16:47, Krzysztof Kozlowski
<krzysztof.kozlowski@canonical.com> wrote:
>
> On Tue, 16 Mar 2021 at 16:43, Dmitry Osipenko <digetx@gmail.com> wrote:
> >
> > 16.03.2021 10:55, Krzysztof Kozlowski пишет:
> > > From: Krzysztof Kozlowski <krzk@kernel.org>
> > >
> > > The Tegra USB PHY driver uses Common Clock Framework thus it cannot be
> > > built on platforms without it (e.g. compile test on MIPS with RALINK and
> > > SOC_RT305X):
> > >
> > >     /usr/bin/mips-linux-gnu-ld: drivers/usb/phy/phy-tegra-usb.o: in function `tegra_usb_phy_init':
> > >     phy-tegra-usb.c:(.text+0x1dd4): undefined reference to `clk_get_parent'
> > >
> > > Reported-by: kernel test robot <lkp@intel.com>
> > > Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
> > >
> > > ---
> > >
> > > Changes since v1:
> > > 1. Depend on COMMON_CLK always, not only for compile test.
> > > ---
> > >  drivers/usb/phy/Kconfig | 1 +
> > >  1 file changed, 1 insertion(+)
> > >
> > > diff --git a/drivers/usb/phy/Kconfig b/drivers/usb/phy/Kconfig
> > > index 52eebcb88c1f..7500e77a7d01 100644
> > > --- a/drivers/usb/phy/Kconfig
> > > +++ b/drivers/usb/phy/Kconfig
> > > @@ -163,6 +163,7 @@ config USB_MXS_PHY
> > >  config USB_TEGRA_PHY
> > >       tristate "NVIDIA Tegra USB PHY Driver"
> > >       depends on ARCH_TEGRA || COMPILE_TEST
> > > +     depends on COMMON_CLK
> > >       select USB_COMMON
> > >       select USB_PHY
> > >       select USB_ULPI
> > >
> >
> > But if COMMON_CLK is disabled, then include/linux/clk.h provides a stub
> > for clk_get_parent(), meaning that MIPS has its own COMMON_CLK, no?
>
> Hi,
>
> It depends on the platform. Not all of them implement every clk API,
> so you can have failures:
> https://lore.kernel.org/lkml/202102170017.MgPVy7aZ-lkp@intel.com/

Ah, you mentioned the stub, so let me clarify more. The common clk
stubs are not used for cases like !COMMON_CLK && HAVE_LEGACY_CLK (or
HAVE_CLK, I don't remember). This is why you can have a MIPS platform
defining some of the clock operations thus not using COMMON_CLK at all
(and neither the stubs).

Best regards,
Krzysztof

Re: [PATCH v2] phy: tegra: depend on COMMON_CLK to fix compile tests

[Dmitry Osipenko]

16.03.2021 18:51, Krzysztof Kozlowski пишет:
> On Tue, 16 Mar 2021 at 16:47, Krzysztof Kozlowski
> <krzysztof.kozlowski@canonical.com> wrote:
>>
>> On Tue, 16 Mar 2021 at 16:43, Dmitry Osipenko <digetx@gmail.com> wrote:
>>>
>>> 16.03.2021 10:55, Krzysztof Kozlowski пишет:
>>>> From: Krzysztof Kozlowski <krzk@kernel.org>
>>>>
>>>> The Tegra USB PHY driver uses Common Clock Framework thus it cannot be
>>>> built on platforms without it (e.g. compile test on MIPS with RALINK and
>>>> SOC_RT305X):
>>>>
>>>>     /usr/bin/mips-linux-gnu-ld: drivers/usb/phy/phy-tegra-usb.o: in function `tegra_usb_phy_init':
>>>>     phy-tegra-usb.c:(.text+0x1dd4): undefined reference to `clk_get_parent'
>>>>
>>>> Reported-by: kernel test robot <lkp@intel.com>
>>>> Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
>>>>
>>>> ---
>>>>
>>>> Changes since v1:
>>>> 1. Depend on COMMON_CLK always, not only for compile test.
>>>> ---
>>>>  drivers/usb/phy/Kconfig | 1 +
>>>>  1 file changed, 1 insertion(+)
>>>>
>>>> diff --git a/drivers/usb/phy/Kconfig b/drivers/usb/phy/Kconfig
>>>> index 52eebcb88c1f..7500e77a7d01 100644
>>>> --- a/drivers/usb/phy/Kconfig
>>>> +++ b/drivers/usb/phy/Kconfig
>>>> @@ -163,6 +163,7 @@ config USB_MXS_PHY
>>>>  config USB_TEGRA_PHY
>>>>       tristate "NVIDIA Tegra USB PHY Driver"
>>>>       depends on ARCH_TEGRA || COMPILE_TEST
>>>> +     depends on COMMON_CLK
>>>>       select USB_COMMON
>>>>       select USB_PHY
>>>>       select USB_ULPI
>>>>
>>>
>>> But if COMMON_CLK is disabled, then include/linux/clk.h provides a stub
>>> for clk_get_parent(), meaning that MIPS has its own COMMON_CLK, no?
>>
>> Hi,
>>
>> It depends on the platform. Not all of them implement every clk API,
>> so you can have failures:
>> https://lore.kernel.org/lkml/202102170017.MgPVy7aZ-lkp@intel.com/
> 
> Ah, you mentioned the stub, so let me clarify more. The common clk
> stubs are not used for cases like !COMMON_CLK && HAVE_LEGACY_CLK (or
> HAVE_CLK, I don't remember). This is why you can have a MIPS platform
> defining some of the clock operations thus not using COMMON_CLK at all
> (and neither the stubs).

I see now that the stubs depend on CONFIG_HAVE_CLK and not COMMON_CLK,
thanks.

This raises question about why those platforms select CONFIG_HAVE_CLK,
while not implementing it fully. Sounds like a better fix should be to
add the missing stubs to the MIPS clk implementation, which should avoid
the need to patch each driver individually.

https://elixir.bootlin.com/linux/v5.12-rc3/source/arch/mips/ar7/clock.c#L489

Re: [PATCH v2] phy: tegra: depend on COMMON_CLK to fix compile tests

[Krzysztof Kozlowski]

On 16/03/2021 17:14, Dmitry Osipenko wrote:
> 16.03.2021 18:51, Krzysztof Kozlowski пишет:
>>>>
>>>> But if COMMON_CLK is disabled, then include/linux/clk.h provides a stub
>>>> for clk_get_parent(), meaning that MIPS has its own COMMON_CLK, no?
>>>
>>> Hi,
>>>
>>> It depends on the platform. Not all of them implement every clk API,
>>> so you can have failures:
>>> https://lore.kernel.org/lkml/202102170017.MgPVy7aZ-lkp@intel.com/
>>
>> Ah, you mentioned the stub, so let me clarify more. The common clk
>> stubs are not used for cases like !COMMON_CLK && HAVE_LEGACY_CLK (or
>> HAVE_CLK, I don't remember). This is why you can have a MIPS platform
>> defining some of the clock operations thus not using COMMON_CLK at all
>> (and neither the stubs).
> 
> I see now that the stubs depend on CONFIG_HAVE_CLK and not COMMON_CLK,
> thanks.
> 
> This raises question about why those platforms select CONFIG_HAVE_CLK,
> while not implementing it fully. Sounds like a better fix should be to
> add the missing stubs to the MIPS clk implementation, which should avoid
> the need to patch each driver individually.
> 
> https://elixir.bootlin.com/linux/v5.12-rc3/source/arch/mips/ar7/clock.c#L489

If such stubs as pointed by you are accepted, then indeed it would be
better approach.

Best regards,
Krzysztof