[PATCH v3 0/2] Add support for Renesas OSTM on RZ/V2N SoC

[PATCH v3 0/2] Add support for Renesas OSTM on RZ/V2N SoC

[Prabhakar]

From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>

Hi all,

This patch series adds support for the Renesas OS Timer (OSTM) found on
the Renesas RZ/V2N (R9A09G056) SoC. The OSTM IP on RZ/V2N is identical to
that on other RZ families.

v2->v3:
- Dropped config check and unconditionally enabled reprobe support for all
  SoCs.

v1->v2:
- Inveted the logic in the dt-bindings to require the "resets" property
- Instead of adding config for new SoC, changed the probe condition to
  `CONFIG_ARM64`.
- Updated commit messages
- Added a Reviewed-by tag from Geert.

v1:
https://lore.kernel.org/all/20250501123709.56513-1-prabhakar.mahadev-lad.rj@bp.renesas.com/

Cheers,
Prabhakar

Lad Prabhakar (2):
  dt-bindings: timer: renesas,ostm: Document RZ/V2N (R9A09G056) support
  clocksource/drivers/renesas-ostm: Unconditionally enable reprobe
    support

 .../devicetree/bindings/timer/renesas,ostm.yaml      | 12 ++++++------
 drivers/clocksource/renesas-ostm.c                   |  2 --
 2 files changed, 6 insertions(+), 8 deletions(-)

-- 
2.49.0

[PATCH v3 1/2] dt-bindings: timer: renesas,ostm: Document RZ/V2N (R9A09G056) support

[Prabhakar]

From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>

Document support for the Renesas OS Timer (OSTM) found on the Renesas
RZ/V2N (R9A09G056) SoC. The OSTM IP on RZ/V2N is identical to that on
other RZ families, so no driver changes are required as `renesas,ostm`
will be used as fallback compatible.

Also update the bindings to require the "resets" property for RZ/V2N
by inverting the logic: all SoCs except RZ/A1 and RZ/A2 now require
the "resets" property.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
---
v2->v3:
- Added Acked-by tag from Conor.

v1->v2:
- Inveted the logic in the dt-bindings to require the "resets" property
- Updated commit message
- Added a Reviewed-by tag from Geert.
---
 .../devicetree/bindings/timer/renesas,ostm.yaml      | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/Documentation/devicetree/bindings/timer/renesas,ostm.yaml b/Documentation/devicetree/bindings/timer/renesas,ostm.yaml
index 9ba858f094ab..0983c1efec80 100644
--- a/Documentation/devicetree/bindings/timer/renesas,ostm.yaml
+++ b/Documentation/devicetree/bindings/timer/renesas,ostm.yaml
@@ -26,6 +26,7 @@ properties:
           - renesas,r9a07g043-ostm # RZ/G2UL and RZ/Five
           - renesas,r9a07g044-ostm # RZ/G2{L,LC}
           - renesas,r9a07g054-ostm # RZ/V2L
+          - renesas,r9a09g056-ostm # RZ/V2N
           - renesas,r9a09g057-ostm # RZ/V2H(P)
       - const: renesas,ostm        # Generic
 
@@ -54,12 +55,11 @@ required:
 if:
   properties:
     compatible:
-      contains:
-        enum:
-          - renesas,r9a07g043-ostm
-          - renesas,r9a07g044-ostm
-          - renesas,r9a07g054-ostm
-          - renesas,r9a09g057-ostm
+      not:
+        contains:
+          enum:
+            - renesas,r7s72100-ostm
+            - renesas,r7s9210-ostm
 then:
   required:
     - resets
-- 
2.49.0

[PATCH v3 2/2] clocksource/drivers/renesas-ostm: Unconditionally enable reprobe support

[Prabhakar]

From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>

Previously, the OSTM driver's platform probe path was only enabled for
selected SoCs (e.g., RZ/G2L and RZ/V2H) due to issues on RZ/Ax (ARM32)
SoCs, which encountered IRQ conflicts like:

    /soc/timer@e803b000: used for clock events
    genirq: Flags mismatch irq 16. 00215201 (timer@e803c000) vs. 00215201 (timer@e803c000)
    Failed to request irq 16 for /soc/timer@e803c000
    renesas_ostm e803c000.timer: probe with driver renesas_ostm failed with error -16

These issues have since been resolved by commit 37385c0772a4
("clocksource/drivers/renesas-ostm: Avoid reprobe after successful early
probe"), which prevents reprobe on successfully initialized early timers.

With this fix in place, there is no longer a need to restrict platform
probing based on SoC-specific configs. This change unconditionally enables
reprobe support for all SoCs, simplifying the logic and avoiding the need
to update the configuration for every new Renesas SoC with OSTM.

RZ/A1 and RZ/A2 remain unaffected with this change.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
---
v2->v3:
- Dropped config check and unconditionally enabled reprobe support for all
  SoCs.
- Dropped Reviewed-by tag from Geert

v1->v2:
- Instead of adding config for new SoC, changed the probe condition to
  `CONFIG_ARM64`.
- Updated commit message
- Added a Reviewed-by tag from Geert.
---
 drivers/clocksource/renesas-ostm.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/clocksource/renesas-ostm.c b/drivers/clocksource/renesas-ostm.c
index 3fcbd02b2483..fcf7ac35a9f1 100644
--- a/drivers/clocksource/renesas-ostm.c
+++ b/drivers/clocksource/renesas-ostm.c
@@ -225,7 +225,6 @@ static int __init ostm_init(struct device_node *np)
 
 TIMER_OF_DECLARE(ostm, "renesas,ostm", ostm_init);
 
-#if defined(CONFIG_ARCH_RZG2L) || defined(CONFIG_ARCH_R9A09G057)
 static int __init ostm_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
@@ -246,4 +245,3 @@ static struct platform_driver ostm_device_driver = {
 	},
 };
 builtin_platform_driver_probe(ostm_device_driver, ostm_probe);
-#endif
-- 
2.49.0

Re: [PATCH v3 2/2] clocksource/drivers/renesas-ostm: Unconditionally enable reprobe support

[Geert Uytterhoeven]

On Tue, 6 May 2025 at 12:32, Prabhakar <prabhakar.csengg@gmail.com> wrote:
> From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
>
> Previously, the OSTM driver's platform probe path was only enabled for
> selected SoCs (e.g., RZ/G2L and RZ/V2H) due to issues on RZ/Ax (ARM32)
> SoCs, which encountered IRQ conflicts like:
>
>     /soc/timer@e803b000: used for clock events
>     genirq: Flags mismatch irq 16. 00215201 (timer@e803c000) vs. 00215201 (timer@e803c000)
>     Failed to request irq 16 for /soc/timer@e803c000
>     renesas_ostm e803c000.timer: probe with driver renesas_ostm failed with error -16
>
> These issues have since been resolved by commit 37385c0772a4
> ("clocksource/drivers/renesas-ostm: Avoid reprobe after successful early
> probe"), which prevents reprobe on successfully initialized early timers.
>
> With this fix in place, there is no longer a need to restrict platform
> probing based on SoC-specific configs. This change unconditionally enables
> reprobe support for all SoCs, simplifying the logic and avoiding the need
> to update the configuration for every new Renesas SoC with OSTM.
>
> RZ/A1 and RZ/A2 remain unaffected with this change.
>
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> ---
> v2->v3:
> - Dropped config check and unconditionally enabled reprobe support for all
>   SoCs.
> - Dropped Reviewed-by tag from Geert

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

Boots fine on RSK+RZA1 and RZA2MEVB.

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

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 v3 2/2] clocksource/drivers/renesas-ostm: Unconditionally enable reprobe support

[kernel test robot]

Hi Prabhakar,

kernel test robot noticed the following build warnings:

[auto build test WARNING on tip/timers/core]
[also build test WARNING on robh/for-next linus/master v6.15-rc6 next-20250514]
[cannot apply to daniel-lezcano/clockevents/next]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Prabhakar/dt-bindings-timer-renesas-ostm-Document-RZ-V2N-R9A09G056-support/20250506-223636
base:   tip/timers/core
patch link:    https://lore.kernel.org/r/20250506103152.109525-3-prabhakar.mahadev-lad.rj%40bp.renesas.com
patch subject: [PATCH v3 2/2] clocksource/drivers/renesas-ostm: Unconditionally enable reprobe support
config: hexagon-randconfig-001-20250513 (https://download.01.org/0day-ci/archive/20250515/202505151255.rCHp8Bvu-lkp@intel.com/config)
compiler: clang version 21.0.0git (https://github.com/llvm/llvm-project f819f46284f2a79790038e1f6649172789734ae8)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250515/202505151255.rCHp8Bvu-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202505151255.rCHp8Bvu-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/clocksource/renesas-ostm.c:235:34: warning: unused variable 'ostm_of_table' [-Wunused-const-variable]
     235 | static const struct of_device_id ostm_of_table[] = {
         |                                  ^~~~~~~~~~~~~
   1 warning generated.


vim +/ostm_of_table +235 drivers/clocksource/renesas-ostm.c

3a3e9f23c2cae9 Biju Das 2021-11-12  234  
3a3e9f23c2cae9 Biju Das 2021-11-12 @235  static const struct of_device_id ostm_of_table[] = {
3a3e9f23c2cae9 Biju Das 2021-11-12  236  	{ .compatible = "renesas,ostm", },
3a3e9f23c2cae9 Biju Das 2021-11-12  237  	{ /* sentinel */ }
3a3e9f23c2cae9 Biju Das 2021-11-12  238  };
3a3e9f23c2cae9 Biju Das 2021-11-12  239  

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki

Re: [PATCH v3 2/2] clocksource/drivers/renesas-ostm: Unconditionally enable reprobe support

[Geert Uytterhoeven]

On Thu, 15 May 2025 at 07:04, kernel test robot <lkp@intel.com> wrote:
> kernel test robot noticed the following build warnings:
>
> [auto build test WARNING on tip/timers/core]
> [also build test WARNING on robh/for-next linus/master v6.15-rc6 next-20250514]
> [cannot apply to daniel-lezcano/clockevents/next]
> [If your patch is applied to the wrong git tree, kindly drop us a note.
> And when submitting patch, we suggest to use '--base' as documented in
> https://git-scm.com/docs/git-format-patch#_base_tree_information]
>
> url:    https://github.com/intel-lab-lkp/linux/commits/Prabhakar/dt-bindings-timer-renesas-ostm-Document-RZ-V2N-R9A09G056-support/20250506-223636
> base:   tip/timers/core
> patch link:    https://lore.kernel.org/r/20250506103152.109525-3-prabhakar.mahadev-lad.rj%40bp.renesas.com
> patch subject: [PATCH v3 2/2] clocksource/drivers/renesas-ostm: Unconditionally enable reprobe support
> config: hexagon-randconfig-001-20250513 (https://download.01.org/0day-ci/archive/20250515/202505151255.rCHp8Bvu-lkp@intel.com/config)
> compiler: clang version 21.0.0git (https://github.com/llvm/llvm-project f819f46284f2a79790038e1f6649172789734ae8)
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250515/202505151255.rCHp8Bvu-lkp@intel.com/reproduce)
>
> If you fix the issue in a separate patch/commit (i.e. not just a new version of
> the same patch/commit), kindly add following tags
> | Reported-by: kernel test robot <lkp@intel.com>
> | Closes: https://lore.kernel.org/oe-kbuild-all/202505151255.rCHp8Bvu-lkp@intel.com/
>
> All warnings (new ones prefixed by >>):
>
> >> drivers/clocksource/renesas-ostm.c:235:34: warning: unused variable 'ostm_of_table' [-Wunused-const-variable]
>      235 | static const struct of_device_id ostm_of_table[] = {
>          |                                  ^~~~~~~~~~~~~
>    1 warning generated.
>
>
> vim +/ostm_of_table +235 drivers/clocksource/renesas-ostm.c
>
> 3a3e9f23c2cae9 Biju Das 2021-11-12  234
> 3a3e9f23c2cae9 Biju Das 2021-11-12 @235  static const struct of_device_id ostm_of_table[] = {
> 3a3e9f23c2cae9 Biju Das 2021-11-12  236         { .compatible = "renesas,ostm", },
> 3a3e9f23c2cae9 Biju Das 2021-11-12  237         { /* sentinel */ }
> 3a3e9f23c2cae9 Biju Das 2021-11-12  238  };
> 3a3e9f23c2cae9 Biju Das 2021-11-12  239

The table is unused if CONFIG_OF=n due to

                .of_match_table = of_match_ptr(ostm_of_table),

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 v3 2/2] clocksource/drivers/renesas-ostm: Unconditionally enable reprobe support

[Lad, Prabhakar]

Hi Geert,

On Thu, May 15, 2025 at 6:59 AM Geert Uytterhoeven <geert@linux-m68k.org> wrote:
>
> On Thu, 15 May 2025 at 07:04, kernel test robot <lkp@intel.com> wrote:
> > kernel test robot noticed the following build warnings:
> >
> > [auto build test WARNING on tip/timers/core]
> > [also build test WARNING on robh/for-next linus/master v6.15-rc6 next-20250514]
> > [cannot apply to daniel-lezcano/clockevents/next]
> > [If your patch is applied to the wrong git tree, kindly drop us a note.
> > And when submitting patch, we suggest to use '--base' as documented in
> > https://git-scm.com/docs/git-format-patch#_base_tree_information]
> >
> > url:    https://github.com/intel-lab-lkp/linux/commits/Prabhakar/dt-bindings-timer-renesas-ostm-Document-RZ-V2N-R9A09G056-support/20250506-223636
> > base:   tip/timers/core
> > patch link:    https://lore.kernel.org/r/20250506103152.109525-3-prabhakar.mahadev-lad.rj%40bp.renesas.com
> > patch subject: [PATCH v3 2/2] clocksource/drivers/renesas-ostm: Unconditionally enable reprobe support
> > config: hexagon-randconfig-001-20250513 (https://download.01.org/0day-ci/archive/20250515/202505151255.rCHp8Bvu-lkp@intel.com/config)
> > compiler: clang version 21.0.0git (https://github.com/llvm/llvm-project f819f46284f2a79790038e1f6649172789734ae8)
> > reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250515/202505151255.rCHp8Bvu-lkp@intel.com/reproduce)
> >
> > If you fix the issue in a separate patch/commit (i.e. not just a new version of
> > the same patch/commit), kindly add following tags
> > | Reported-by: kernel test robot <lkp@intel.com>
> > | Closes: https://lore.kernel.org/oe-kbuild-all/202505151255.rCHp8Bvu-lkp@intel.com/
> >
> > All warnings (new ones prefixed by >>):
> >
> > >> drivers/clocksource/renesas-ostm.c:235:34: warning: unused variable 'ostm_of_table' [-Wunused-const-variable]
> >      235 | static const struct of_device_id ostm_of_table[] = {
> >          |                                  ^~~~~~~~~~~~~
> >    1 warning generated.
> >
> >
> > vim +/ostm_of_table +235 drivers/clocksource/renesas-ostm.c
> >
> > 3a3e9f23c2cae9 Biju Das 2021-11-12  234
> > 3a3e9f23c2cae9 Biju Das 2021-11-12 @235  static const struct of_device_id ostm_of_table[] = {
> > 3a3e9f23c2cae9 Biju Das 2021-11-12  236         { .compatible = "renesas,ostm", },
> > 3a3e9f23c2cae9 Biju Das 2021-11-12  237         { /* sentinel */ }
> > 3a3e9f23c2cae9 Biju Das 2021-11-12  238  };
> > 3a3e9f23c2cae9 Biju Das 2021-11-12  239
>
> The table is unused if CONFIG_OF=n due to
>
>                 .of_match_table = of_match_ptr(ostm_of_table),
>
Thanks for the pointer, I'll add a __maybe_unused compiler attribute
and send a new version.

Cheers,
Prabhakar

> 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