[PATCH v2 3/5] dt-bindings: iio: magnetometer: asahi-kasei,ak8975: Drop deprecated enums

[PATCH v2 3/5] dt-bindings: iio: magnetometer: asahi-kasei,ak8975: Drop deprecated enums

[Biju Das]

Drop deprecated enums from bindings as it is been here for a long time.

Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
---
v2:
 * New patch
---
 .../bindings/iio/magnetometer/asahi-kasei,ak8975.yaml      | 7 -------
 1 file changed, 7 deletions(-)

diff --git a/Documentation/devicetree/bindings/iio/magnetometer/asahi-kasei,ak8975.yaml b/Documentation/devicetree/bindings/iio/magnetometer/asahi-kasei,ak8975.yaml
index 9790f75fc669..ee77558e9800 100644
--- a/Documentation/devicetree/bindings/iio/magnetometer/asahi-kasei,ak8975.yaml
+++ b/Documentation/devicetree/bindings/iio/magnetometer/asahi-kasei,ak8975.yaml
@@ -18,13 +18,6 @@ properties:
           - asahi-kasei,ak09911
           - asahi-kasei,ak09912
           - asahi-kasei,ak09916
-      - enum:
-          - ak8975
-          - ak8963
-          - ak09911
-          - ak09912
-          - ak09916
-        deprecated: true
 
   reg:
     maxItems: 1
-- 
2.25.1

RE: [PATCH v2 5/5] iio: magnetometer: ak8975: Sort OF table

[Biju Das]

Hi Andy Shevchenko,

> Subject: Re: [PATCH v2 5/5] iio: magnetometer: ak8975: Sort OF table
> 
> On Fri, Aug 18, 2023 at 11:39:03AM +0000, Biju Das wrote:
> > > On Fri, Aug 18, 2023 at 08:56:00AM +0100, Biju Das wrote:
> > > > Sort OF table alphabetically by compatibles.
> > >
> > > > Suggested-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
> > >
> > > Wrong, I haven't suggested that. See comment to the previous patch.
> > >
> > > And this is definitely wrong as Geert explained already why.
> > > You need to fix the code that handles the ID table first.
> >
> > That rule applicable only for fallback. I checked bindings and there are
> no fallbacks.
> 
> You can't check the _whole_ world, so you checked only bindings that are in
> tree.
> But it doesn't matter as a user somewhere may use something you have no
> access to.

Yes true, for those not using tree can patch bindings and modify the
driver and dts accordingly.

If they are using tree, they must go with binding docs and update driver/bindings accordingly.

+ device_tree.

Cheers,
Biju

RE: [PATCH v2 4/5] iio: magnetometer: ak8975: Drop deprecated enums from OF table

[Biju Das]

Hi Andy Shevchenko,

> Subject: Re: [PATCH v2 4/5] iio: magnetometer: ak8975: Drop deprecated
> enums from OF table
> 
> On Fri, Aug 18, 2023 at 11:40:37AM +0000, Biju Das wrote:
> > Hi Andy Shevchenko,
> >
> > > Subject: Re: [PATCH v2 4/5] iio: magnetometer: ak8975: Drop
> > > deprecated enums from OF table
> > >
> > > On Fri, Aug 18, 2023 at 08:55:59AM +0100, Biju Das wrote:
> > > > Drop deprecated enums from OF table as corresponding entries are
> > > > removed from bindings and it also saves memory.
> > >
> > > You can't do this.
> > >
> > > Only sorting by "prefixed first" criteria is possible.
> >
> > The rule applies only for fallback compatible. I checked bindings and
> > I don't find any fallback compatibles. All compatibles are just enums.
> > Am I missing anything here??
> 
> Yes. As per above patch. The _whole_ world is not under your / our control.
> NAK to this change, sorry.

+ device tree

All drivers that uses OF table and device tree must be based on the device tree documentation on the tree.

I agree the _whole_ world is not under your / our control. But we support whatever available on the kernel tree right? why do we care those not in the tree?

Cheers,
Biju

Re: [PATCH v2 3/5] dt-bindings: iio: magnetometer: asahi-kasei,ak8975: Drop deprecated enums

[Geert Uytterhoeven]

Hi Biju,

Thanks for your patch!

On Fri, Aug 18, 2023 at 9:56 AM Biju Das <biju.das.jz@bp.renesas.com> wrote:
> Drop deprecated enums from bindings as it is been here for a long time.

The single user ever in the upstream kernel was fixed in commit
9846210b1ec9bbaa ("ARM: tegra: seaboard: add missing DT vendor
prefixes") in v3.8 back in 2012.
And it had to be fixed again 9 years later in commit fa0fdb78cb5d4cde
("ARM: dts: am335x: Use correct vendor prefix for Asahi Kasei Corp.").

>
> Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>

Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>

> --- a/Documentation/devicetree/bindings/iio/magnetometer/asahi-kasei,ak8975.yaml
> +++ b/Documentation/devicetree/bindings/iio/magnetometer/asahi-kasei,ak8975.yaml
> @@ -18,13 +18,6 @@ properties:
>            - asahi-kasei,ak09911
>            - asahi-kasei,ak09912
>            - asahi-kasei,ak09916
> -      - enum:
> -          - ak8975
> -          - ak8963
> -          - ak09911
> -          - ak09912
> -          - ak09916
> -        deprecated: true
>
>    reg:
>      maxItems: 1

Gr{oetje,eeting}s,

                        Geert


--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

Re: [PATCH v2 4/5] iio: magnetometer: ak8975: Drop deprecated enums from OF table

[Geert Uytterhoeven]

Hi Andy,

CC devicetree

On Fri, Aug 18, 2023 at 5:03 PM Andy Shevchenko
<andriy.shevchenko@linux.intel.com> wrote:
> On Fri, Aug 18, 2023 at 11:40:37AM +0000, Biju Das wrote:
> > > Subject: Re: [PATCH v2 4/5] iio: magnetometer: ak8975: Drop deprecated
> > > enums from OF table
> > >
> > > On Fri, Aug 18, 2023 at 08:55:59AM +0100, Biju Das wrote:
> > > > Drop deprecated enums from OF table as corresponding entries are
> > > > removed from bindings and it also saves memory.
> > >
> > > You can't do this.
> > >
> > > Only sorting by "prefixed first" criteria is possible.
> >
> > The rule applies only for fallback compatible. I checked bindings and I don't
> > find any fallback compatibles. All compatibles are just enums. Am I missing
> > anything here??
>
> Yes. As per above patch. The _whole_ world is not under your / our control.
> NAK to this change, sorry.

The single user ever in the upstream kernel was fixed in commit
9846210b1ec9bbaa ("ARM: tegra: seaboard: add missing DT vendor
prefixes") in v3.8 back in 2012.
And it had to be fixed again 9 years later in commit fa0fdb78cb5d4cde
("ARM: dts: am335x: Use correct vendor prefix for Asahi Kasei Corp.").

There may be other out-of-tree users, which would be broken by this
change.  Typically we wait a few years between deprecating a compatible
value and removing support from the driver.

As Biju is only deprecating these compatible values in PATCH 3/5 of
his series, this may be a bit premature.

Gr{oetje,eeting}s,

                        Geert


--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

Re: [PATCH v2 3/5] dt-bindings: iio: magnetometer: asahi-kasei,ak8975: Drop deprecated enums

[Rob Herring]

On Fri, Aug 18, 2023 at 08:55:58AM +0100, Biju Das wrote:
> Drop deprecated enums from bindings as it is been here for a long time.

Would be good to have "long time" defined as Geert provided.

> 
> Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
> ---
> v2:
>  * New patch
> ---
>  .../bindings/iio/magnetometer/asahi-kasei,ak8975.yaml      | 7 -------
>  1 file changed, 7 deletions(-)

Acked-by: Rob Herring <robh@kernel.org>

Re: [PATCH v2 4/5] iio: magnetometer: ak8975: Drop deprecated enums from OF table

[Jonathan Cameron]

On Fri, 18 Aug 2023 17:17:44 +0200
Geert Uytterhoeven <geert@linux-m68k.org> wrote:

> Hi Andy,
> 
> CC devicetree
> 
> On Fri, Aug 18, 2023 at 5:03 PM Andy Shevchenko
> <andriy.shevchenko@linux.intel.com> wrote:
> > On Fri, Aug 18, 2023 at 11:40:37AM +0000, Biju Das wrote:  
> > > > Subject: Re: [PATCH v2 4/5] iio: magnetometer: ak8975: Drop deprecated
> > > > enums from OF table
> > > >
> > > > On Fri, Aug 18, 2023 at 08:55:59AM +0100, Biju Das wrote:  
> > > > > Drop deprecated enums from OF table as corresponding entries are
> > > > > removed from bindings and it also saves memory.  
> > > >
> > > > You can't do this.
> > > >
> > > > Only sorting by "prefixed first" criteria is possible.  
> > >
> > > The rule applies only for fallback compatible. I checked bindings and I don't
> > > find any fallback compatibles. All compatibles are just enums. Am I missing
> > > anything here??  
> >
> > Yes. As per above patch. The _whole_ world is not under your / our control.
> > NAK to this change, sorry.  
> 
> The single user ever in the upstream kernel was fixed in commit
> 9846210b1ec9bbaa ("ARM: tegra: seaboard: add missing DT vendor
> prefixes") in v3.8 back in 2012.
> And it had to be fixed again 9 years later in commit fa0fdb78cb5d4cde
> ("ARM: dts: am335x: Use correct vendor prefix for Asahi Kasei Corp.").
> 
> There may be other out-of-tree users, which would be broken by this
> change.  Typically we wait a few years between deprecating a compatible
> value and removing support from the driver.
> 
> As Biju is only deprecating these compatible values in PATCH 3/5 of
> his series, this may be a bit premature.
Absolutely.  I'd go a bit further.
Unless there is a maintenance reason to remove these (after a few years from
removal in the binding doc) then we never remove them as it can only hurt users.

Jonathan

> 
> Gr{oetje,eeting}s,
> 
>                         Geert
> 
> 
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
> 
> In personal conversations with technical people, I call myself a hacker. But
> when I'm talking to journalists I just say "programmer" or something like that.
>                                 -- Linus Torvalds

Re: [PATCH v2 3/5] dt-bindings: iio: magnetometer: asahi-kasei,ak8975: Drop deprecated enums

[Jonathan Cameron]

On Fri, 18 Aug 2023 08:55:58 +0100
Biju Das <biju.das.jz@bp.renesas.com> wrote:

> Drop deprecated enums from bindings as it is been here for a long time.
> 
> Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Applied patches 1-3

Thanks,

Jonathan

> ---
> v2:
>  * New patch
> ---
>  .../bindings/iio/magnetometer/asahi-kasei,ak8975.yaml      | 7 -------
>  1 file changed, 7 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/iio/magnetometer/asahi-kasei,ak8975.yaml b/Documentation/devicetree/bindings/iio/magnetometer/asahi-kasei,ak8975.yaml
> index 9790f75fc669..ee77558e9800 100644
> --- a/Documentation/devicetree/bindings/iio/magnetometer/asahi-kasei,ak8975.yaml
> +++ b/Documentation/devicetree/bindings/iio/magnetometer/asahi-kasei,ak8975.yaml
> @@ -18,13 +18,6 @@ properties:
>            - asahi-kasei,ak09911
>            - asahi-kasei,ak09912
>            - asahi-kasei,ak09916
> -      - enum:
> -          - ak8975
> -          - ak8963
> -          - ak09911
> -          - ak09912
> -          - ak09916
> -        deprecated: true
>  
>    reg:
>      maxItems: 1

Re: [PATCH v2 4/5] iio: magnetometer: ak8975: Drop deprecated enums from OF table

[Rob Herring]

On Mon, Aug 28, 2023 at 9:22 AM Jonathan Cameron <jic23@kernel.org> wrote:
>
> On Fri, 18 Aug 2023 17:17:44 +0200
> Geert Uytterhoeven <geert@linux-m68k.org> wrote:
>
> > Hi Andy,
> >
> > CC devicetree
> >
> > On Fri, Aug 18, 2023 at 5:03 PM Andy Shevchenko
> > <andriy.shevchenko@linux.intel.com> wrote:
> > > On Fri, Aug 18, 2023 at 11:40:37AM +0000, Biju Das wrote:
> > > > > Subject: Re: [PATCH v2 4/5] iio: magnetometer: ak8975: Drop deprecated
> > > > > enums from OF table
> > > > >
> > > > > On Fri, Aug 18, 2023 at 08:55:59AM +0100, Biju Das wrote:
> > > > > > Drop deprecated enums from OF table as corresponding entries are
> > > > > > removed from bindings and it also saves memory.
> > > > >
> > > > > You can't do this.
> > > > >
> > > > > Only sorting by "prefixed first" criteria is possible.
> > > >
> > > > The rule applies only for fallback compatible. I checked bindings and I don't
> > > > find any fallback compatibles. All compatibles are just enums. Am I missing
> > > > anything here??
> > >
> > > Yes. As per above patch. The _whole_ world is not under your / our control.
> > > NAK to this change, sorry.
> >
> > The single user ever in the upstream kernel was fixed in commit
> > 9846210b1ec9bbaa ("ARM: tegra: seaboard: add missing DT vendor
> > prefixes") in v3.8 back in 2012.
> > And it had to be fixed again 9 years later in commit fa0fdb78cb5d4cde
> > ("ARM: dts: am335x: Use correct vendor prefix for Asahi Kasei Corp.").
> >
> > There may be other out-of-tree users, which would be broken by this
> > change.  Typically we wait a few years between deprecating a compatible
> > value and removing support from the driver.
> >
> > As Biju is only deprecating these compatible values in PATCH 3/5 of
> > his series, this may be a bit premature.
> Absolutely.  I'd go a bit further.
> Unless there is a maintenance reason to remove these (after a few years from
> removal in the binding doc) then we never remove them as it can only hurt users.

I'm tracking undocumented compatibles (with 'make
dt_compatible_check') in the kernel tree. Dropping the binding makes
these undocumented (and now showing up in my diff between Linus and
next). So please apply both or none.

Rob

Re: [PATCH v2 4/5] iio: magnetometer: ak8975: Drop deprecated enums from OF table

[Jonathan Cameron]

On Fri, 6 Oct 2023 09:58:34 -0500
Rob Herring <robh@kernel.org> wrote:

> On Mon, Aug 28, 2023 at 9:22 AM Jonathan Cameron <jic23@kernel.org> wrote:
> >
> > On Fri, 18 Aug 2023 17:17:44 +0200
> > Geert Uytterhoeven <geert@linux-m68k.org> wrote:
> >  
> > > Hi Andy,
> > >
> > > CC devicetree
> > >
> > > On Fri, Aug 18, 2023 at 5:03 PM Andy Shevchenko
> > > <andriy.shevchenko@linux.intel.com> wrote:  
> > > > On Fri, Aug 18, 2023 at 11:40:37AM +0000, Biju Das wrote:  
> > > > > > Subject: Re: [PATCH v2 4/5] iio: magnetometer: ak8975: Drop deprecated
> > > > > > enums from OF table
> > > > > >
> > > > > > On Fri, Aug 18, 2023 at 08:55:59AM +0100, Biju Das wrote:  
> > > > > > > Drop deprecated enums from OF table as corresponding entries are
> > > > > > > removed from bindings and it also saves memory.  
> > > > > >
> > > > > > You can't do this.
> > > > > >
> > > > > > Only sorting by "prefixed first" criteria is possible.  
> > > > >
> > > > > The rule applies only for fallback compatible. I checked bindings and I don't
> > > > > find any fallback compatibles. All compatibles are just enums. Am I missing
> > > > > anything here??  
> > > >
> > > > Yes. As per above patch. The _whole_ world is not under your / our control.
> > > > NAK to this change, sorry.  
> > >
> > > The single user ever in the upstream kernel was fixed in commit
> > > 9846210b1ec9bbaa ("ARM: tegra: seaboard: add missing DT vendor
> > > prefixes") in v3.8 back in 2012.
> > > And it had to be fixed again 9 years later in commit fa0fdb78cb5d4cde
> > > ("ARM: dts: am335x: Use correct vendor prefix for Asahi Kasei Corp.").
> > >
> > > There may be other out-of-tree users, which would be broken by this
> > > change.  Typically we wait a few years between deprecating a compatible
> > > value and removing support from the driver.
> > >
> > > As Biju is only deprecating these compatible values in PATCH 3/5 of
> > > his series, this may be a bit premature.  
> > Absolutely.  I'd go a bit further.
> > Unless there is a maintenance reason to remove these (after a few years from
> > removal in the binding doc) then we never remove them as it can only hurt users.  
> 
> I'm tracking undocumented compatibles (with 'make
> dt_compatible_check') in the kernel tree. Dropping the binding makes
> these undocumented (and now showing up in my diff between Linus and
> next). So please apply both or none.
> 
> Rob

Given I have some merges in the togreg tree and it's at least in theory
non rebasing, I'll revert patch 3 from this series rather than dropping it.

Thanks for letting me know.

Jonathan