Re: [PATCH 06/11] clk: sunxi-ng: sun55i-a523-ccu: Lower audio0 pll minimum rate

Dne ponedeljek, 20. oktober 2025 ob 20:09:18 Srednjeevropski poletni čas je Chen-Yu Tsai napisal(a):

On Tue, Oct 21, 2025 at 1:52 AM Jernej Škrabec [off-list ref] wrote:

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Dne ponedeljek, 20. oktober 2025 ob 19:10:52 Srednjeevropski poletni čas je Chen-Yu Tsai napisal(a):

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While the user manual states that the PLL's rate should be between 180
MHz and 3 GHz in the register defninition section, it also says the
actual operating frequency is 22.5792*4 MHz in the PLL features table.

22.5792*4 MHz is one of the actual clock rates that we want and is
is available in the SDM table. Lower the minimum clock rate to 90 MHz
so that both rates in the SDM table can be used.

So factor of 2 could be missed somewhere?

Not sure what you mean? This PLL only gives *4 and *1 outputs.

Right. Nevermind then.

Best regards,
Jernej

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Fixes: 7cae1e2b5544 ("clk: sunxi-ng: Add support for the A523/T527 CCU PLLs")
Signed-off-by: Chen-Yu Tsai <wens@kernel.org>

Reviewed-by: Jernej Skrabec <jernej.skrabec@gmail.com>

Best regards,
Jernej

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---
 drivers/clk/sunxi-ng/ccu-sun55i-a523.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/clk/sunxi-ng/ccu-sun55i-a523.c b/drivers/clk/sunxi-ng/ccu-sun55i-a523.c
index acb532f8361b..20dad06b37ca 100644
--- a/drivers/clk/sunxi-ng/ccu-sun55i-a523.c
+++ b/drivers/clk/sunxi-ng/ccu-sun55i-a523.c

@@ -300,7 +300,7 @@ static struct ccu_nm pll_audio0_4x_clk = {
      .m              = _SUNXI_CCU_DIV(16, 6),
      .sdm            = _SUNXI_CCU_SDM(pll_audio0_sdm_table, BIT(24),
                                       0x178, BIT(31)),
-     .min_rate       = 180000000U,
+     .min_rate       = 90000000U,
      .max_rate       = 3000000000U,
      .common         = {
              .reg            = 0x078,