[PATCH v2] clk: spacemit: k3: add 1.8 GHz PLL5 and PLL8 rates

[Troy Mitchell]

K3 boot firmware configures the C2 and C3 CPU clock domains at
1.8 GHz. PLL5 feeds C2 and PLL8 feeds C3, but their rate tables
currently contain only the 2 GHz overclocking operating point.

Add the nominal 1.8 GHz configuration as the first entry in both
tables. This lets determine_rate() and set_rate() select the firmware
operating point while retaining 2 GHz as a supported overclocking rate.

Signed-off-by: Troy Mitchell <troy.mitchell at linux.spacemit.com>
---
The related U-Boot change is available at:
https://github.com/spacemit-com/uboot-2022.10/commit/fb95cf3d848b771c61b5a1b3e5cbbee223faf352
---
Changes in v2:
- Drop "clk: spacemit: re-enable PLLs after init"; the PLL init issue
  will be handled in a separate series.
- Send the K3 PLL5 and PLL8 1.8 GHz rate-table update as a standalone
  patch.
- Clarify that 1.8 GHz is nominal and 2 GHz is an overclocking rate.
- Link to v1: https://patch.msgid.link/20260804-k3-pll5-pll8-1800mhz-v1-0-a3a75866ce32@linux.spacemit.com

To: Michael Turquette <mturquette at baylibre.com>
To: Stephen Boyd <sboyd at kernel.org>
To: Brian Masney <bmasney at redhat.com>
To: Yixun Lan <dlan at kernel.org>
To: Paul Walmsley <pjw at kernel.org>
To: Palmer Dabbelt <palmer at dabbelt.com>
To: Albert Ou <aou at eecs.berkeley.edu>
To: Alexandre Ghiti <alex at ghiti.fr>
Cc: linux-clk at vger.kernel.org
Cc: linux-riscv at lists.infradead.org
Cc: spacemit at lists.linux.dev
Cc: linux-kernel at vger.kernel.org
---
 drivers/clk/spacemit/ccu-k3.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/clk/spacemit/ccu-k3.c b/drivers/clk/spacemit/ccu-k3.c
index cb0c4277f72a..e8b7ce89c2cb 100644
--- a/drivers/clk/spacemit/ccu-k3.c
+++ b/drivers/clk/spacemit/ccu-k3.c
@@ -38,6 +38,7 @@ static const struct ccu_pll_rate_tbl pll4_rate_tbl[] = {
 };
 
 static const struct ccu_pll_rate_tbl pll5_rate_tbl[] = {
+	CCU_PLLA_RATE(1800000000UL, 0x0b4b0000, 0x00000000, 0xa0458585),
 	CCU_PLLA_RATE(2000000000UL, 0x0b292aaa, 0x0000ab00, 0xa0558686),
 };
 
@@ -50,6 +51,7 @@ static const struct ccu_pll_rate_tbl pll7_rate_tbl[] = {
 };
 
 static const struct ccu_pll_rate_tbl pll8_rate_tbl[] = {
+	CCU_PLLA_RATE(1800000000UL, 0x0b4b0000, 0x00000000, 0xa0458585),
 	CCU_PLLA_RATE(2000000000UL, 0x0b292aaa, 0x0000ab00, 0xa0558686),
 };
 

---
base-commit: 1590cf0329716306e948a8fc29f1d3ee87d3989f
change-id: 20260802-k3-pll5-pll8-1800mhz-c81875a0a944

Best regards,
--  
Troy Mitchell <troy.mitchell at linux.spacemit.com>