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

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Date: Sun, 25 Feb 2024 23:00:02 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Gabor Juhos <j4g8y7@...il.com>
Cc: 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>, linux-arm-msm@...r.kernel.org, 
	linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] clk: qcom: gcc-ipq5018: fix 'enable_reg' offset of 'gcc_gmac0_sys_clk'

On Sun, 25 Feb 2024 at 19:33, Gabor Juhos <j4g8y7@...il.com> wrote:
>
> 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(-)

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>

--
With best wishes
Dmitry