diff mbox series

[v2,2/2] clocksource/drivers/renesas-ostm: Allow OSTM driver to reprobe for RZ/V2H(P) SoC

Message ID 20240322151219.885832-3-prabhakar.mahadev-lad.rj@bp.renesas.com (mailing list archive)
State New, archived
Headers show
Series Add OSTM support for Renesas RZ/V2H(P) SoC | expand

Commit Message

Lad, Prabhakar March 22, 2024, 3:12 p.m. UTC 
From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>

The RZ/V2H(P) (R9A09G057) SoC is equipped with the Generic Timer Module,
also known as OSTM. Similar to the RZ/G2L SoC, the OSTM on the RZ/V2H(P)
SoC requires the reset line to be deasserted before accessing any
registers.

Early call to ostm_init() happens through TIMER_OF_DECLARE() which always
fails with -EPROBE_DEFER, as resets are not available that early in the
boot process.  To address this issue on the RZ/V2H(P) SoC, enable the OSTM
driver to be reprobed through the platform driver probe mechanism.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
---
v1->v2
- Updated commit description
- Dropped usage of IS_ENABLED() and used defined() instead
---
 drivers/clocksource/renesas-ostm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Comments

Geert Uytterhoeven April 17, 2024, 3:07 p.m. UTC | #1 
On Fri, Mar 22, 2024 at 4:13 PM Prabhakar <prabhakar.csengg@gmail.com> wrote:
> From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
>
> The RZ/V2H(P) (R9A09G057) SoC is equipped with the Generic Timer Module,
> also known as OSTM. Similar to the RZ/G2L SoC, the OSTM on the RZ/V2H(P)
> SoC requires the reset line to be deasserted before accessing any
> registers.
>
> Early call to ostm_init() happens through TIMER_OF_DECLARE() which always
> fails with -EPROBE_DEFER, as resets are not available that early in the
> boot process.  To address this issue on the RZ/V2H(P) SoC, enable the OSTM
> driver to be reprobed through the platform driver probe mechanism.
>
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> ---
> v1->v2
> - Updated commit description
> - Dropped usage of IS_ENABLED() and used defined() instead

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

Gr{oetje,eeting}s,

                        Geert
diff mbox series

Patch

diff --git a/drivers/clocksource/renesas-ostm.c b/drivers/clocksource/renesas-ostm.c
index 8da972dc1713..39487d05a009 100644
--- a/drivers/clocksource/renesas-ostm.c
+++ b/drivers/clocksource/renesas-ostm.c
@@ -224,7 +224,7 @@  static int __init ostm_init(struct device_node *np)
 
 TIMER_OF_DECLARE(ostm, "renesas,ostm", ostm_init);
 
-#ifdef CONFIG_ARCH_RZG2L
+#if defined(CONFIG_ARCH_RZG2L) || defined(CONFIG_ARCH_R9A09G057)
 static int __init ostm_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;