linux-kernel - [PATCH 2/5] clk: qcom: apps-ipq-pll: drop 'alpha_en

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Message-Id: <20241021-alpha-mode-cleanup-v1-2-55df8ed73645@gmail.com>
Date: Mon, 21 Oct 2024 22:21:58 +0200
From: Gabor Juhos <j4g8y7@...il.com>
To: Bjorn Andersson <andersson@...nel.org>, 
 Michael Turquette <mturquette@...libre.com>, 
 Stephen Boyd <sboyd@...nel.org>
Cc: linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Gabor Juhos <j4g8y7@...il.com>
Subject: [PATCH 2/5] clk: qcom: apps-ipq-pll: drop 'alpha_en_mask' from
 IPQ5332 PLL config

Since neither 'alpha' nor 'alpha_hi' is defined in the configuration,
those will be initialized with zero values implicitly. By using zero
alpha values, the output rate of the PLL will be the same whether
alpha mode is enabled or not.

Remove the superfluous initialization of the 'alpha_en_mask' member
to make it clear that enabling alpha mode is not required to get the
desired output rate.

While at it, also add a comment to indicate the frequency the PLL
runs at with the current configuration.

No functional changes, the initial rate of the PLL is the same both
before and after the patch.

Tested on Xiaomi Router BE3600 2.5G (IPQ5312, out-of-tree board).

Signed-off-by: Gabor Juhos <j4g8y7@...il.com>
---
 drivers/clk/qcom/apss-ipq-pll.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/clk/qcom/apss-ipq-pll.c b/drivers/clk/qcom/apss-ipq-pll.c
index dec2a5019cc77bf60142a86453883e336afc860f..d6c1aea7e9e1e50a8d7561ce352feac4e76fb1e3 100644
--- a/drivers/clk/qcom/apss-ipq-pll.c
+++ b/drivers/clk/qcom/apss-ipq-pll.c
@@ -79,13 +79,13 @@ static const struct alpha_pll_config ipq5018_pll_config = {
 	.test_ctl_hi_val = 0x00400003,
 };
 
+/* 1.080 GHz configuration */
 static const struct alpha_pll_config ipq5332_pll_config = {
 	.l = 0x2d,
 	.config_ctl_val = 0x4001075b,
 	.main_output_mask = BIT(0),
 	.aux_output_mask = BIT(1),
 	.early_output_mask = BIT(3),
-	.alpha_en_mask = BIT(24),
 	.status_val = 0x3,
 	.status_mask = GENMASK(10, 8),
 	.lock_det = BIT(2),

-- 
2.47.0