diff mbox

[v5,02/23] of: device: Export of_device_{get_modalias,uvent_modalias} to modules

Message ID 20161018015636.11701-3-stephen.boyd@linaro.org (mailing list archive)
State Not Applicable, archived
Delegated to: Andy Gross
Headers show

Commit Message

Stephen Boyd Oct. 18, 2016, 1:56 a.m. UTC 
The ULPI bus can be built as a module, and it will soon be
calling these functions when it supports probing devices from DT.
Export them so they can be used by the ULPI module.

Acked-by: Rob Herring <robh@kernel.org>
Cc: <devicetree@vger.kernel.org>
Signed-off-by: Stephen Boyd <stephen.boyd@linaro.org>
---
 drivers/of/device.c | 2 ++
 1 file changed, 2 insertions(+)

Comments

Chen-Yu Tsai Oct. 18, 2016, 5:20 a.m. UTC | #1 
On Tue, Oct 18, 2016 at 9:56 AM, Stephen Boyd <stephen.boyd@linaro.org> wrote:
> The ULPI bus can be built as a module, and it will soon be
> calling these functions when it supports probing devices from DT.
> Export them so they can be used by the ULPI module.
>
> Acked-by: Rob Herring <robh@kernel.org>
> Cc: <devicetree@vger.kernel.org>
> Signed-off-by: Stephen Boyd <stephen.boyd@linaro.org>

I'm interested in this as well. The sunxi-rsb bus is non-enumerable
and DT only, and existing slave device drivers can be built as modules.
We'd need this to support modalias loading of drivers.

ChenYu
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Chen-Yu Tsai Oct. 24, 2016, 12:19 p.m. UTC | #2 
Hi,

On Tue, Oct 18, 2016 at 9:56 AM, Stephen Boyd <stephen.boyd@linaro.org> wrote:
> The ULPI bus can be built as a module, and it will soon be
> calling these functions when it supports probing devices from DT.
> Export them so they can be used by the ULPI module.
>
> Acked-by: Rob Herring <robh@kernel.org>
> Cc: <devicetree@vger.kernel.org>
> Signed-off-by: Stephen Boyd <stephen.boyd@linaro.org>
> ---
>  drivers/of/device.c | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/drivers/of/device.c b/drivers/of/device.c
> index 8a22a253a830..6719ab35b62e 100644
> --- a/drivers/of/device.c
> +++ b/drivers/of/device.c
> @@ -225,6 +225,7 @@ ssize_t of_device_get_modalias(struct device *dev, char *str, ssize_t len)
>
>         return tsize;
>  }
> +EXPORT_SYMBOL_GPL(of_device_get_modalias);
>
>  int of_device_request_module(struct device *dev)
>  {
> @@ -290,6 +291,7 @@ void of_device_uevent(struct device *dev, struct kobj_uevent_env *env)
>         }
>         mutex_unlock(&of_mutex);
>  }
> +EXPORT_SYMBOL_GPL(of_device_uevent_modalias);

This is trailing the wrong function.

ChenYu

>
>  int of_device_uevent_modalias(struct device *dev, struct kobj_uevent_env *env)
>  {
> --
> 2.10.0.297.gf6727b0
>
>
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Peter Chen Oct. 25, 2016, 1:16 a.m. UTC | #3 
On Mon, Oct 24, 2016 at 12:48:24PM -0700, Stephen Boyd wrote:
> Quoting Chen-Yu Tsai (2016-10-24 05:19:05)
> > Hi,
> > 
> > On Tue, Oct 18, 2016 at 9:56 AM, Stephen Boyd <stephen.boyd@linaro.org> wrote:
> > > The ULPI bus can be built as a module, and it will soon be
> > > calling these functions when it supports probing devices from DT.
> > > Export them so they can be used by the ULPI module.
> > >
> > > Acked-by: Rob Herring <robh@kernel.org>
> > > Cc: <devicetree@vger.kernel.org>
> > > Signed-off-by: Stephen Boyd <stephen.boyd@linaro.org>
> > > ---
> > >  drivers/of/device.c | 2 ++
> > >  1 file changed, 2 insertions(+)
> > >
> > > diff --git a/drivers/of/device.c b/drivers/of/device.c
> > > index 8a22a253a830..6719ab35b62e 100644
> > > --- a/drivers/of/device.c
> > > +++ b/drivers/of/device.c
> > > @@ -225,6 +225,7 @@ ssize_t of_device_get_modalias(struct device *dev, char *str, ssize_t len)
> > >
> > >         return tsize;
> > >  }
> > > +EXPORT_SYMBOL_GPL(of_device_get_modalias);
> > >
> > >  int of_device_request_module(struct device *dev)
> > >  {
> > > @@ -290,6 +291,7 @@ void of_device_uevent(struct device *dev, struct kobj_uevent_env *env)
> > >         }
> > >         mutex_unlock(&of_mutex);
> > >  }
> > > +EXPORT_SYMBOL_GPL(of_device_uevent_modalias);
> > 
> > This is trailing the wrong function.
> > 
> 
> Good catch. Must have been some bad rebase.
> 
> Peter, can you fix it while applying or should I resend this patch?
> 

But, this is device tree patch. I can only get chipidea part and other
USB patches if Greg agrees.
Stephen Boyd Nov. 4, 2016, 8:51 p.m. UTC | #4 
Quoting Peter Chen (2016-10-24 18:16:32)
> On Mon, Oct 24, 2016 at 12:48:24PM -0700, Stephen Boyd wrote:
> > Quoting Chen-Yu Tsai (2016-10-24 05:19:05)
> > > Hi,
> > > 
> > > On Tue, Oct 18, 2016 at 9:56 AM, Stephen Boyd <stephen.boyd@linaro.org> wrote:
> > > > The ULPI bus can be built as a module, and it will soon be
> > > > calling these functions when it supports probing devices from DT.
> > > > Export them so they can be used by the ULPI module.
> > > >
> > > > Acked-by: Rob Herring <robh@kernel.org>
> > > > Cc: <devicetree@vger.kernel.org>
> > > > Signed-off-by: Stephen Boyd <stephen.boyd@linaro.org>
> > > > ---
> > > >  drivers/of/device.c | 2 ++
> > > >  1 file changed, 2 insertions(+)
> > > >
> > > > diff --git a/drivers/of/device.c b/drivers/of/device.c
> > > > index 8a22a253a830..6719ab35b62e 100644
> > > > --- a/drivers/of/device.c
> > > > +++ b/drivers/of/device.c
> > > > @@ -225,6 +225,7 @@ ssize_t of_device_get_modalias(struct device *dev, char *str, ssize_t len)
> > > >
> > > >         return tsize;
> > > >  }
> > > > +EXPORT_SYMBOL_GPL(of_device_get_modalias);
> > > >
> > > >  int of_device_request_module(struct device *dev)
> > > >  {
> > > > @@ -290,6 +291,7 @@ void of_device_uevent(struct device *dev, struct kobj_uevent_env *env)
> > > >         }
> > > >         mutex_unlock(&of_mutex);
> > > >  }
> > > > +EXPORT_SYMBOL_GPL(of_device_uevent_modalias);
> > > 
> > > This is trailing the wrong function.
> > > 
> > 
> > Good catch. Must have been some bad rebase.
> > 
> > Peter, can you fix it while applying or should I resend this patch?
> > 
> 
> But, this is device tree patch. I can only get chipidea part and other
> USB patches if Greg agrees.
> 

Were you expecting Rob to take the drivers/of/* patches? Sorry I thought
Rob acked them so they could go through usb with the other changes.
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Peter Chen Nov. 7, 2016, 1:29 a.m. UTC | #5 
On Fri, Nov 04, 2016 at 01:51:34PM -0700, Stephen Boyd wrote:
> Quoting Peter Chen (2016-10-24 18:16:32)
> > On Mon, Oct 24, 2016 at 12:48:24PM -0700, Stephen Boyd wrote:
> > > Quoting Chen-Yu Tsai (2016-10-24 05:19:05)
> > > > Hi,
> > > > 
> > > > On Tue, Oct 18, 2016 at 9:56 AM, Stephen Boyd <stephen.boyd@linaro.org> wrote:
> > > > > The ULPI bus can be built as a module, and it will soon be
> > > > > calling these functions when it supports probing devices from DT.
> > > > > Export them so they can be used by the ULPI module.
> > > > >
> > > > > Acked-by: Rob Herring <robh@kernel.org>
> > > > > Cc: <devicetree@vger.kernel.org>
> > > > > Signed-off-by: Stephen Boyd <stephen.boyd@linaro.org>
> > > > > ---
> > > > >  drivers/of/device.c | 2 ++
> > > > >  1 file changed, 2 insertions(+)
> > > > >
> > > > > diff --git a/drivers/of/device.c b/drivers/of/device.c
> > > > > index 8a22a253a830..6719ab35b62e 100644
> > > > > --- a/drivers/of/device.c
> > > > > +++ b/drivers/of/device.c
> > > > > @@ -225,6 +225,7 @@ ssize_t of_device_get_modalias(struct device *dev, char *str, ssize_t len)
> > > > >
> > > > >         return tsize;
> > > > >  }
> > > > > +EXPORT_SYMBOL_GPL(of_device_get_modalias);
> > > > >
> > > > >  int of_device_request_module(struct device *dev)
> > > > >  {
> > > > > @@ -290,6 +291,7 @@ void of_device_uevent(struct device *dev, struct kobj_uevent_env *env)
> > > > >         }
> > > > >         mutex_unlock(&of_mutex);
> > > > >  }
> > > > > +EXPORT_SYMBOL_GPL(of_device_uevent_modalias);
> > > > 
> > > > This is trailing the wrong function.
> > > > 
> > > 
> > > Good catch. Must have been some bad rebase.
> > > 
> > > Peter, can you fix it while applying or should I resend this patch?
> > > 
> > 
> > But, this is device tree patch. I can only get chipidea part and other
> > USB patches if Greg agrees.
> > 
> 
> Were you expecting Rob to take the drivers/of/* patches? Sorry I thought
> Rob acked them so they could go through usb with the other changes.

I am just worried about possible merge error when linus pulls both OF
and USB tree. Greg, is it ok the OF patches through USB tree with OF
maintainer's ack?
Chen-Yu Tsai Nov. 7, 2016, 1:56 a.m. UTC | #6 
On Mon, Nov 7, 2016 at 9:29 AM, Peter Chen <hzpeterchen@gmail.com> wrote:
> On Fri, Nov 04, 2016 at 01:51:34PM -0700, Stephen Boyd wrote:
>> Quoting Peter Chen (2016-10-24 18:16:32)
>> > On Mon, Oct 24, 2016 at 12:48:24PM -0700, Stephen Boyd wrote:
>> > > Quoting Chen-Yu Tsai (2016-10-24 05:19:05)
>> > > > Hi,
>> > > >
>> > > > On Tue, Oct 18, 2016 at 9:56 AM, Stephen Boyd <stephen.boyd@linaro.org> wrote:
>> > > > > The ULPI bus can be built as a module, and it will soon be
>> > > > > calling these functions when it supports probing devices from DT.
>> > > > > Export them so they can be used by the ULPI module.
>> > > > >
>> > > > > Acked-by: Rob Herring <robh@kernel.org>
>> > > > > Cc: <devicetree@vger.kernel.org>
>> > > > > Signed-off-by: Stephen Boyd <stephen.boyd@linaro.org>
>> > > > > ---
>> > > > >  drivers/of/device.c | 2 ++
>> > > > >  1 file changed, 2 insertions(+)
>> > > > >
>> > > > > diff --git a/drivers/of/device.c b/drivers/of/device.c
>> > > > > index 8a22a253a830..6719ab35b62e 100644
>> > > > > --- a/drivers/of/device.c
>> > > > > +++ b/drivers/of/device.c
>> > > > > @@ -225,6 +225,7 @@ ssize_t of_device_get_modalias(struct device *dev, char *str, ssize_t len)
>> > > > >
>> > > > >         return tsize;
>> > > > >  }
>> > > > > +EXPORT_SYMBOL_GPL(of_device_get_modalias);
>> > > > >
>> > > > >  int of_device_request_module(struct device *dev)
>> > > > >  {
>> > > > > @@ -290,6 +291,7 @@ void of_device_uevent(struct device *dev, struct kobj_uevent_env *env)
>> > > > >         }
>> > > > >         mutex_unlock(&of_mutex);
>> > > > >  }
>> > > > > +EXPORT_SYMBOL_GPL(of_device_uevent_modalias);
>> > > >
>> > > > This is trailing the wrong function.
>> > > >
>> > >
>> > > Good catch. Must have been some bad rebase.
>> > >
>> > > Peter, can you fix it while applying or should I resend this patch?
>> > >
>> >
>> > But, this is device tree patch. I can only get chipidea part and other
>> > USB patches if Greg agrees.
>> >
>>
>> Were you expecting Rob to take the drivers/of/* patches? Sorry I thought
>> Rob acked them so they could go through usb with the other changes.
>
> I am just worried about possible merge error when linus pulls both OF
> and USB tree. Greg, is it ok the OF patches through USB tree with OF
> maintainer's ack?

May I suggest putting the OF patches on an immutable branch so other
subsystems can pull them in without pulling in the USB patches? At
least I want to use them in the I2C subsystem, and in the sunxi-rsb
driver.


Regards
ChenYu
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Rob Herring (Arm) Nov. 10, 2016, 9:42 p.m. UTC | #7 
On Sun, Nov 6, 2016 at 7:56 PM, Chen-Yu Tsai <wens@csie.org> wrote:
> On Mon, Nov 7, 2016 at 9:29 AM, Peter Chen <hzpeterchen@gmail.com> wrote:
>> On Fri, Nov 04, 2016 at 01:51:34PM -0700, Stephen Boyd wrote:
>>> Quoting Peter Chen (2016-10-24 18:16:32)
>>> > On Mon, Oct 24, 2016 at 12:48:24PM -0700, Stephen Boyd wrote:
>>> > > Quoting Chen-Yu Tsai (2016-10-24 05:19:05)
>>> > > > Hi,
>>> > > >
>>> > > > On Tue, Oct 18, 2016 at 9:56 AM, Stephen Boyd <stephen.boyd@linaro.org> wrote:
>>> > > > > The ULPI bus can be built as a module, and it will soon be
>>> > > > > calling these functions when it supports probing devices from DT.
>>> > > > > Export them so they can be used by the ULPI module.
>>> > > > >
>>> > > > > Acked-by: Rob Herring <robh@kernel.org>
>>> > > > > Cc: <devicetree@vger.kernel.org>
>>> > > > > Signed-off-by: Stephen Boyd <stephen.boyd@linaro.org>
>>> > > > > ---
>>> > > > >  drivers/of/device.c | 2 ++
>>> > > > >  1 file changed, 2 insertions(+)
>>> > > > >
>>> > > > > diff --git a/drivers/of/device.c b/drivers/of/device.c
>>> > > > > index 8a22a253a830..6719ab35b62e 100644
>>> > > > > --- a/drivers/of/device.c
>>> > > > > +++ b/drivers/of/device.c
>>> > > > > @@ -225,6 +225,7 @@ ssize_t of_device_get_modalias(struct device *dev, char *str, ssize_t len)
>>> > > > >
>>> > > > >         return tsize;
>>> > > > >  }
>>> > > > > +EXPORT_SYMBOL_GPL(of_device_get_modalias);
>>> > > > >
>>> > > > >  int of_device_request_module(struct device *dev)
>>> > > > >  {
>>> > > > > @@ -290,6 +291,7 @@ void of_device_uevent(struct device *dev, struct kobj_uevent_env *env)
>>> > > > >         }
>>> > > > >         mutex_unlock(&of_mutex);
>>> > > > >  }
>>> > > > > +EXPORT_SYMBOL_GPL(of_device_uevent_modalias);
>>> > > >
>>> > > > This is trailing the wrong function.
>>> > > >
>>> > >
>>> > > Good catch. Must have been some bad rebase.
>>> > >
>>> > > Peter, can you fix it while applying or should I resend this patch?
>>> > >
>>> >
>>> > But, this is device tree patch. I can only get chipidea part and other
>>> > USB patches if Greg agrees.
>>> >
>>>
>>> Were you expecting Rob to take the drivers/of/* patches? Sorry I thought
>>> Rob acked them so they could go through usb with the other changes.
>>
>> I am just worried about possible merge error when linus pulls both OF
>> and USB tree. Greg, is it ok the OF patches through USB tree with OF
>> maintainer's ack?
>
> May I suggest putting the OF patches on an immutable branch so other
> subsystems can pull them in without pulling in the USB patches? At
> least I want to use them in the I2C subsystem, and in the sunxi-rsb
> driver.

Do you have patches using this already. If not, it is starting to get
a bit late for v4.10.

I can apply this, but then you'll just be pulling in other DT patches.

Rob
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Chen-Yu Tsai Nov. 11, 2016, 3:01 a.m. UTC | #8 
On Fri, Nov 11, 2016 at 5:42 AM, Rob Herring <robh@kernel.org> wrote:
> On Sun, Nov 6, 2016 at 7:56 PM, Chen-Yu Tsai <wens@csie.org> wrote:
>> On Mon, Nov 7, 2016 at 9:29 AM, Peter Chen <hzpeterchen@gmail.com> wrote:
>>> On Fri, Nov 04, 2016 at 01:51:34PM -0700, Stephen Boyd wrote:
>>>> Quoting Peter Chen (2016-10-24 18:16:32)
>>>> > On Mon, Oct 24, 2016 at 12:48:24PM -0700, Stephen Boyd wrote:
>>>> > > Quoting Chen-Yu Tsai (2016-10-24 05:19:05)
>>>> > > > Hi,
>>>> > > >
>>>> > > > On Tue, Oct 18, 2016 at 9:56 AM, Stephen Boyd <stephen.boyd@linaro.org> wrote:
>>>> > > > > The ULPI bus can be built as a module, and it will soon be
>>>> > > > > calling these functions when it supports probing devices from DT.
>>>> > > > > Export them so they can be used by the ULPI module.
>>>> > > > >
>>>> > > > > Acked-by: Rob Herring <robh@kernel.org>
>>>> > > > > Cc: <devicetree@vger.kernel.org>
>>>> > > > > Signed-off-by: Stephen Boyd <stephen.boyd@linaro.org>
>>>> > > > > ---
>>>> > > > >  drivers/of/device.c | 2 ++
>>>> > > > >  1 file changed, 2 insertions(+)
>>>> > > > >
>>>> > > > > diff --git a/drivers/of/device.c b/drivers/of/device.c
>>>> > > > > index 8a22a253a830..6719ab35b62e 100644
>>>> > > > > --- a/drivers/of/device.c
>>>> > > > > +++ b/drivers/of/device.c
>>>> > > > > @@ -225,6 +225,7 @@ ssize_t of_device_get_modalias(struct device *dev, char *str, ssize_t len)
>>>> > > > >
>>>> > > > >         return tsize;
>>>> > > > >  }
>>>> > > > > +EXPORT_SYMBOL_GPL(of_device_get_modalias);
>>>> > > > >
>>>> > > > >  int of_device_request_module(struct device *dev)
>>>> > > > >  {
>>>> > > > > @@ -290,6 +291,7 @@ void of_device_uevent(struct device *dev, struct kobj_uevent_env *env)
>>>> > > > >         }
>>>> > > > >         mutex_unlock(&of_mutex);
>>>> > > > >  }
>>>> > > > > +EXPORT_SYMBOL_GPL(of_device_uevent_modalias);
>>>> > > >
>>>> > > > This is trailing the wrong function.
>>>> > > >
>>>> > >
>>>> > > Good catch. Must have been some bad rebase.
>>>> > >
>>>> > > Peter, can you fix it while applying or should I resend this patch?
>>>> > >
>>>> >
>>>> > But, this is device tree patch. I can only get chipidea part and other
>>>> > USB patches if Greg agrees.
>>>> >
>>>>
>>>> Were you expecting Rob to take the drivers/of/* patches? Sorry I thought
>>>> Rob acked them so they could go through usb with the other changes.
>>>
>>> I am just worried about possible merge error when linus pulls both OF
>>> and USB tree. Greg, is it ok the OF patches through USB tree with OF
>>> maintainer's ack?
>>
>> May I suggest putting the OF patches on an immutable branch so other
>> subsystems can pull them in without pulling in the USB patches? At
>> least I want to use them in the I2C subsystem, and in the sunxi-rsb
>> driver.
>
> Do you have patches using this already. If not, it is starting to get
> a bit late for v4.10.
>
> I can apply this, but then you'll just be pulling in other DT patches.

Not sure what you mean by "using" this...

I have patches which use this to add DT-based modalias entries for
module auto-loading to i2c and sunxi-rsb that I haven't sent.

As far as DT usage goes, we already need this for the axp20x mfd driver.
There are 2 variants, i2c and sunxi-rsb. For the I2C variant a fix was
sent to fix module auto-loading by using the I2C client ID table:

    mfd: axp20x-i2c: Add i2c-ids to fix module auto-loading
    https://git.kernel.org/cgit/linux/kernel/git/lee/mfd.git/commit/?h=for-mfd-next&id=b7142a19321484bd7681aa547c1d50148c8e2825

But for the sunxi-rsb variant such a fix does not exist, as the bus
does not have a separate ID table. It uses DT exclusively.


Regards
ChenYu
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Javier Martinez Canillas Nov. 11, 2016, 4:25 a.m. UTC | #9 
Hello ChenYu

On Fri, Nov 11, 2016 at 12:01 AM, Chen-Yu Tsai <wens@csie.org> wrote:
> On Fri, Nov 11, 2016 at 5:42 AM, Rob Herring <robh@kernel.org> wrote:

[snip]

>>
>> Do you have patches using this already. If not, it is starting to get
>> a bit late for v4.10.
>>
>> I can apply this, but then you'll just be pulling in other DT patches.
>
> Not sure what you mean by "using" this...
>
> I have patches which use this to add DT-based modalias entries for
> module auto-loading to i2c and sunxi-rsb that I haven't sent.
>

Unfortunately the I2C core can't be changed without breaking a lot of
I2C drivers that are relying on the current behavior. I've already
posted a RFC patch [0] for I2C that does this about a year ago and
enumerated the issues that have to be addressed before the change can
be made (and fixed some of the issues mentioned) on this series [1].

Another issue is that an I2C device ID table is a requirement anyways
since I2C drivers expect an i2c_device_id as an argument of their
probe function. Kieran already have patches [2] to change that which
should land soon.

I plan to fix the remaining I2C drivers once his patches are merged
and re-post the RFC patch as a proper one.

> As far as DT usage goes, we already need this for the axp20x mfd driver.
> There are 2 variants, i2c and sunxi-rsb. For the I2C variant a fix was
> sent to fix module auto-loading by using the I2C client ID table:
>
>     mfd: axp20x-i2c: Add i2c-ids to fix module auto-loading
>     https://git.kernel.org/cgit/linux/kernel/git/lee/mfd.git/commit/?h=for-mfd-next&id=b7142a19321484bd7681aa547c1d50148c8e2825
>

Yes, this is the workaround used by most DT-only I2C drivers. The only
reason that these drivers have an I2C device ID is due the
restrictions imposed by the I2C core.

Best regards,
Javier
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diff mbox

Patch

diff --git a/drivers/of/device.c b/drivers/of/device.c
index 8a22a253a830..6719ab35b62e 100644
--- a/drivers/of/device.c
+++ b/drivers/of/device.c
@@ -225,6 +225,7 @@  ssize_t of_device_get_modalias(struct device *dev, char *str, ssize_t len)
 
 	return tsize;
 }
+EXPORT_SYMBOL_GPL(of_device_get_modalias);
 
 int of_device_request_module(struct device *dev)
 {
@@ -290,6 +291,7 @@  void of_device_uevent(struct device *dev, struct kobj_uevent_env *env)
 	}
 	mutex_unlock(&of_mutex);
 }
+EXPORT_SYMBOL_GPL(of_device_uevent_modalias);
 
 int of_device_uevent_modalias(struct device *dev, struct kobj_uevent_env *env)
 {