[PATCH 0/2] ARM: socfpga: arria10: earlier debug output

[PATCH 0/2] ARM: socfpga: arria10: earlier debug output

[Steffen Trumtrar]

The UART is a dedicated peripheral on Arria10 and therefore can be used
without the FPGA bitstream loaded. Move the lowlevel UART init to an
earlier stage to get debugging output for the DDR and FPGA setup .

Tested on the Reflex Achilles.

Signed-off-by: Steffen Trumtrar <s.trumtrar@pengutronix.de>
---
Bruno Knittel (2):
      ARM: socfpga: arria10-reset-manager: release UART0
      ARM: socfpga: arria10-init: setup uart earlier

 arch/arm/mach-socfpga/arria10-init.c          | 8 ++++----
 arch/arm/mach-socfpga/arria10-reset-manager.c | 1 +
 2 files changed, 5 insertions(+), 4 deletions(-)
---
base-commit: d6f0974673c0e3da00f8d0789d6302a43f3e478d
change-id: 20251114-v2025-11-0-topic-socfpga-arria10-c56efb6d862c

Best regards,
-- 
Steffen Trumtrar <s.trumtrar@pengutronix.de>

[PATCH 1/2] ARM: socfpga: arria10-reset-manager: release UART0

[Steffen Trumtrar]

From: Bruno Knittel <bruno.knittel@bruker.com>

UART0 is also a dedictated peripheral. Release from reset to have
earlier serial for debugging.

Signed-off-by: Bruno Knittel <bruno.knittel@bruker.com>
Signed-off-by: Steffen Trumtrar <s.trumtrar@pengutronix.de>
---
 arch/arm/mach-socfpga/arria10-reset-manager.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/mach-socfpga/arria10-reset-manager.c b/arch/arm/mach-socfpga/arria10-reset-manager.c
index 6f209e7045..01534cd74b 100644
--- a/arch/arm/mach-socfpga/arria10-reset-manager.c
+++ b/arch/arm/mach-socfpga/arria10-reset-manager.c
@@ -86,6 +86,7 @@ void arria10_reset_deassert_dedicated_peripherals(void)
 	mask = ARRIA10_RSTMGR_PER1MODRST_I2C3 |
 	       ARRIA10_RSTMGR_PER1MODRST_I2C4 |
 	       ARRIA10_RSTMGR_PER1MODRST_I2C2 |
+	       ARRIA10_RSTMGR_PER1MODRST_UART0 |
 	       ARRIA10_RSTMGR_PER1MODRST_UART1 |
 	       ARRIA10_RSTMGR_PER1MODRST_GPIO2;
 	clrbits_le32(ARRIA10_RSTMGR_ADDR + ARRIA10_RSTMGR_PER1MODRST, mask);

-- 
2.46.0

[PATCH 2/2] ARM: socfpga: arria10-init: setup uart earlier

[Steffen Trumtrar]

From: Bruno Knittel <bruno.knittel@bruker.com>

Dedicated peripherals like GPIO but especially UART can be enabled and
used before the FPGA is configured.

This commit ensures socfpga_uart_setup_ll() is done before FPGA
configuration and allows to have UART debug output as early as possible.

Signed-off-by: Bruno Knittel <bruno.knittel@bruker.com>
Signed-off-by: Steffen Trumtrar <s.trumtrar@pengutronix.de>
---
 arch/arm/mach-socfpga/arria10-init.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/arch/arm/mach-socfpga/arria10-init.c b/arch/arm/mach-socfpga/arria10-init.c
index 14cee3196a..7b438a8947 100644
--- a/arch/arm/mach-socfpga/arria10-init.c
+++ b/arch/arm/mach-socfpga/arria10-init.c
@@ -146,10 +146,6 @@ void arria10_finish_io(uint32_t *pinmux)
 	arria10_reset_deassert_shared_peripherals();
 
 	arria10_reset_deassert_fpga_peripherals();
-
-	socfpga_uart_setup_ll();
-
-	puts_ll("lowlevel init done\n");
 }
 /*
  * First C function to initialize the critical hardware early
@@ -197,4 +193,8 @@ void arria10_init(struct arria10_mainpll_cfg *mainpll,
 
 	/* deassert peripheral resets */
 	arria10_reset_deassert_dedicated_peripherals();
+
+	socfpga_uart_setup_ll();
+
+	puts_ll("lowlevel init done\n");
 }

-- 
2.46.0

Re: [PATCH 0/2] ARM: socfpga: arria10: earlier debug output

[Sascha Hauer]

On Fri, 14 Nov 2025 08:23:14 +0100, Steffen Trumtrar wrote:
> The UART is a dedicated peripheral on Arria10 and therefore can be used
> without the FPGA bitstream loaded. Move the lowlevel UART init to an
> earlier stage to get debugging output for the DDR and FPGA setup .
> 
> Tested on the Reflex Achilles.
> 
> 
> [...]

Applied, thanks!

[1/2] ARM: socfpga: arria10-reset-manager: release UART0
      https://git.pengutronix.de/cgit/barebox/commit/?id=0ecec7397757 (link may not be stable)
[2/2] ARM: socfpga: arria10-init: setup uart earlier
      https://git.pengutronix.de/cgit/barebox/commit/?id=5378bef5c19e (link may not be stable)

Best regards,
-- 
Sascha Hauer <s.hauer@pengutronix.de>