From: Ahmad Fatoum <a.fatoum@barebox.org>
To: barebox@lists.infradead.org
Cc: "Claude Opus 4.6" <noreply@anthropic.com>,
Ahmad Fatoum <a.fatoum@barebox.org>
Subject: [PATCH 5/6] mach-mpc85xx: speed: add fsl_set_timebase_clock() override
Date: Mon, 9 Feb 2026 10:10:30 +0100 [thread overview]
Message-ID: <20260209091513.3563412-6-a.fatoum@barebox.org> (raw)
In-Reply-To: <20260209091513.3563412-1-a.fatoum@barebox.org>
Some platforms (e.g. QEMU) don't implement the GUTS PORPLLSR register,
so the register-based timebase frequency calculation returns 0. Add
fsl_set_timebase_clock() that allows board code to provide the correct
timebase frequency before initcalls run, bypassing the register read.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Signed-off-by: Ahmad Fatoum <a.fatoum@barebox.org>
---
arch/powerpc/mach-mpc85xx/include/mach/clock.h | 1 +
arch/powerpc/mach-mpc85xx/speed.c | 10 ++++++++++
2 files changed, 11 insertions(+)
diff --git a/arch/powerpc/mach-mpc85xx/include/mach/clock.h b/arch/powerpc/mach-mpc85xx/include/mach/clock.h
index bfd9cf4d8ecd..2d0f079f5c68 100644
--- a/arch/powerpc/mach-mpc85xx/include/mach/clock.h
+++ b/arch/powerpc/mach-mpc85xx/include/mach/clock.h
@@ -14,6 +14,7 @@ struct sys_info {
unsigned long fsl_get_bus_freq(ulong dummy);
unsigned long fsl_get_ddr_freq(ulong dummy);
+void fsl_set_timebase_clock(unsigned long freq);
unsigned long fsl_get_timebase_clock(void);
unsigned long fsl_get_i2c_freq(void);
void fsl_get_sys_info(struct sys_info *sysInfo);
diff --git a/arch/powerpc/mach-mpc85xx/speed.c b/arch/powerpc/mach-mpc85xx/speed.c
index 4a69de3dc81a..8018132874ba 100644
--- a/arch/powerpc/mach-mpc85xx/speed.c
+++ b/arch/powerpc/mach-mpc85xx/speed.c
@@ -104,10 +104,20 @@ unsigned long fsl_get_ddr_freq(ulong dummy)
return sys_info.freqDDRBus;
}
+static unsigned long timebase_clock_override;
+
+void fsl_set_timebase_clock(unsigned long freq)
+{
+ timebase_clock_override = freq;
+}
+
unsigned long fsl_get_timebase_clock(void)
{
struct sys_info sysinfo;
+ if (timebase_clock_override)
+ return timebase_clock_override;
+
fsl_get_sys_info(&sysinfo);
return (sysinfo.freqSystemBus + 4UL)/8UL;
--
2.47.3
next prev parent reply other threads:[~2026-02-09 9:15 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-02-09 9:10 [PATCH 0/6] ppc: add QEMU ppce500 test in CI Ahmad Fatoum
2026-02-09 9:10 ` [PATCH 1/6] include: array_size.h: make header self-contained Ahmad Fatoum
2026-02-09 9:10 ` [PATCH 2/6] serial: ns16550: add "ns16550" compatible string Ahmad Fatoum
2026-02-09 9:10 ` [PATCH 3/6] lib: stackprot: omit HAVE_STACKPROTECTOR for powerpc Ahmad Fatoum
2026-02-09 9:10 ` [PATCH 4/6] gpio: mpc8xxx: allow build on MPC85xx platforms Ahmad Fatoum
2026-02-09 9:10 ` Ahmad Fatoum [this message]
2026-02-09 9:10 ` [PATCH 6/6] powerpc: add QEMU ppce500 board support with CI test infrastructure Ahmad Fatoum
2026-02-11 9:34 ` [PATCH 0/6] ppc: add QEMU ppce500 test in CI Sascha Hauer
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