linux-kernel - [PATCH v2 0/2] clk: spacemit: fix sspax

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Message-Id: <20250722-k1-clk-i2s-v2-0-2f8edfe3dab4@linux.spacemit.com>
Date: Tue, 22 Jul 2025 15:36:29 +0800
From: Troy Mitchell <troy.mitchell@...ux.spacemit.com>
To: Michael Turquette <mturquette@...libre.com>, 
 Stephen Boyd <sboyd@...nel.org>, Yixun Lan <dlan@...too.org>, 
 Alex Elder <elder@...cstar.com>, Haylen Chu <heylenay@....org>, 
 Inochi Amaoto <inochiama@...look.com>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>
Cc: linux-clk@...r.kernel.org, linux-riscv@...ts.infradead.org, 
 spacemit@...ts.linux.dev, linux-kernel@...r.kernel.org, 
 devicetree@...r.kernel.org, 
 Troy Mitchell <troy.mitchell@...ux.spacemit.com>, 
 Yao Zi <ziyao@...root.org>
Subject: [PATCH v2 0/2] clk: spacemit: fix sspax_clk

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@...ux.spacemit.com>
---
Change log in v2:
  - Use dummy 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):
      clk: spacemit: fix sspax_clk
      dt-bindings: clock: spacemit: CLK_SSPA_I2S_BCLK for SSPA

 drivers/clk/spacemit/ccu-k1.c                  |  25 +++++-
 include/dt-bindings/clock/spacemit,k1-syscon.h | 114 +++++++++++++------------
 2 files changed, 79 insertions(+), 60 deletions(-)
---
base-commit: 733923397fd95405a48f165c9b1fbc8c4b0a4681
change-id: 20250717-k1-clk-i2s-e4272f1f915b

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