linux-kernel - [PATCH 1/3] clk: qcom: gcc-ipq5018: fix 'enable_reg' offset of 'gcc_gmac0_sys

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Message-Id: <20240225-gcc-ipq5018-register-fixes-v1-1-3c191404d9f0@gmail.com>
Date: Sun, 25 Feb 2024 18:32:54 +0100
From: Gabor Juhos <j4g8y7@...il.com>
To: Bjorn Andersson <andersson@...nel.org>, 
 Konrad Dybcio <konrad.dybcio@...aro.org>, 
 Michael Turquette <mturquette@...libre.com>, 
 Stephen Boyd <sboyd@...nel.org>, 
 Gokul Sriram Palanisamy <quic_gokulsri@...cinc.com>, 
 Varadarajan Narayanan <quic_varada@...cinc.com>, 
 Sricharan Ramabadhran <quic_srichara@...cinc.com>
Cc: linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Gabor Juhos <j4g8y7@...il.com>
Subject: [PATCH 1/3] clk: qcom: gcc-ipq5018: fix 'enable_reg' offset of
 'gcc_gmac0_sys_clk'

The value of the 'enable_reg' field in the 'gcc_gmac0_sys_clk'
clock definition seems wrong as it is greater than the
'max_register' value defined in the regmap configuration.
Additionally, all other gmac specific branch clock definitions
within the driver uses the same value both for the 'enable_reg'
and for the 'halt_reg' fields.

Due to the lack of documentation the correct value is not known.
Looking into the downstream driver does not help either, as that
uses the same (presumably wrong) value [1].

Nevertheless, change the 'enable_reg' field of 'gcc_gmac0_sys_clk'
to use the value from the 'halt_reg' field so it follows the pattern
used in other gmac clock definitions. The change is based on the
assumption that the register layout of this clock is the same
as the other gmac clocks.

1. https://git.codelinaro.org/clo/qsdk/oss/kernel/linux-ipq-5.4/-/blob/NHSS.QSDK.12.4.r4/drivers/clk/qcom/gcc-ipq5018.c?ref_type=heads#L1889

Fixes: e3fdbef1bab8 ("clk: qcom: Add Global Clock controller (GCC) driver for IPQ5018")
Signed-off-by: Gabor Juhos <j4g8y7@...il.com>
---
 drivers/clk/qcom/gcc-ipq5018.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/clk/qcom/gcc-ipq5018.c b/drivers/clk/qcom/gcc-ipq5018.c
index 4aba47e8700d2..cef9a1e7c9fdb 100644
--- a/drivers/clk/qcom/gcc-ipq5018.c
+++ b/drivers/clk/qcom/gcc-ipq5018.c
@@ -1754,7 +1754,7 @@ static struct clk_branch gcc_gmac0_sys_clk = {
 	.halt_check = BRANCH_HALT_DELAY,
 	.halt_bit = 31,
 	.clkr = {
-		.enable_reg = 0x683190,
+		.enable_reg = 0x68190,
 		.enable_mask = BIT(0),
 		.hw.init = &(struct clk_init_data) {
 			.name = "gcc_gmac0_sys_clk",

-- 
2.43.2