[PATCH RESEND v5 0/2] clk: spacemit: fix sspax_clk

[Troy Mitchell <troy.mitchell@linux.spacemit.com>]

In the SpacemiT public document, when the FNCLKSEL field of
the APBC_SSPAX_CLK_RST register is 7 (3'b111),
which is a reserved value. And BIT3 of the same register is
a reserved bit.

But the documentation is incorrect. In reality, the value 7 (3'b111)
of FNCLKSEL is not reserved. Instead, it indicates that i2s_bclk is
selected as the parent clock. Similarly, bit 3 is not reserved either.
When FNCLKSEL is set to 7, bit 3 determines whether i2s_bclk is actually
enabled as the parent clock.

In all other cases (i.e., when FNCLKSEL is not 7), bit 3 has no effect.

Importantly, whenever FNCLKSEL is set to 7, bit 3 must also be set to 1,
otherwise the selection of i2s_bclk becomes invalid.

Signed-off-by: Troy Mitchell <troy.mitchell@linux.spacemit.com>
---
btw, the public documentation for the k1 clock has been updated.
---
Changes in v5:
  - move fixes tag from cover-letter to patch1/2 and patch2/2
  - modify commit messages
  - Link to v3: https://lore.kernel.org/r/20250731-k1-clk-i2s-v3-0-2f655ddb0c6f@linux.spacemit.com

Changes in v4:
  - add comments
  - add tags
  - Link to v3: https://lore.kernel.org/r/20250731-k1-clk-i2s-v3-0-2f655ddb0c6f@linux.spacemit.com

Changes in v3:
  - Fixing ABI-breaking behavior
  - Modify commit msgs
  - Link to v2: https://lore.kernel.org/r/20250722-k1-clk-i2s-v2-0-2f8edfe3dab4@linux.spacemit.com

Changes in v2:
  - Use virtual gate instead of new function for sspa
  - Add Suggested-by tag: Yao Zi
  - Add Fixes tag
  - Link to v1: https://lore.kernel.org/all/20250718-k1-clk-i2s-v1-1-e92c10fd0f60@linux.spacemit.com/

---
Troy Mitchell (2):
      dt-bindings: clock: spacemit: CLK_SSPA_I2S_BCLK for SSPA
      clk: spacemit: fix sspax_clk

 drivers/clk/spacemit/ccu-k1.c                  | 29 ++++++++++++++++++++++----
 include/dt-bindings/clock/spacemit,k1-syscon.h |  2 ++
 2 files changed, 27 insertions(+), 4 deletions(-)
---
base-commit: 8f5ae30d69d7543eee0d70083daf4de8fe15d585
change-id: 20250717-k1-clk-i2s-e4272f1f915b

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


_______________________________________________
linux-riscv mailing list
linux-riscv@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-riscv