Re: [PATCH 2/2] clk: qcom: gcc-msm8996: Use read-only RCG ops for RPM bus clocks

[Konrad Dybcio]

On 12.06.2023 14:23, Stephan Gerhold wrote:
> On Mon, Jun 12, 2023 at 01:46:26PM +0200, Konrad Dybcio wrote:
>> On 12.06.2023 12:17, Stephan Gerhold wrote:
>>> On Mon, Jun 12, 2023 at 11:22:48AM +0200, Konrad Dybcio wrote:
>>>> The config/periph/system NoC clocks are wholly controlled by the
>>>> RPM firmware and Linux should never ever alter their configuration.
>>>>
>>>> Switch them over to read-only ops to avoid that.
>>>>
>>>> Fixes: b1e010c0730a ("clk: qcom: Add MSM8996 Global Clock Control (GCC) driver")
>>>> Signed-off-by: Konrad Dybcio <konrad.dybcio@xxxxxxxxxx>
>>>> ---
>>>>  drivers/clk/qcom/gcc-msm8996.c | 6 +++---
>>>>  1 file changed, 3 insertions(+), 3 deletions(-)
>>>>
>>>> diff --git a/drivers/clk/qcom/gcc-msm8996.c b/drivers/clk/qcom/gcc-msm8996.c
>>>> index 5e44d1bcca9e..588e3b67657a 100644
>>>> --- a/drivers/clk/qcom/gcc-msm8996.c
>>>> +++ b/drivers/clk/qcom/gcc-msm8996.c
>>>> @@ -264,7 +264,7 @@ static struct clk_rcg2 system_noc_clk_src = {
>>>>  		.name = "system_noc_clk_src",
>>>>  		.parent_data = gcc_xo_gpll0_gpll0_early_div,
>>>>  		.num_parents = ARRAY_SIZE(gcc_xo_gpll0_gpll0_early_div),
>>>> -		.ops = &clk_rcg2_ops,
>>>> +		.ops = &clk_rcg2_ro_ops,
>>>>  	},
>>>>  };
>>>>  
>>>> @@ -284,7 +284,7 @@ static struct clk_rcg2 config_noc_clk_src = {
>>>>  		.name = "config_noc_clk_src",
>>>>  		.parent_data = gcc_xo_gpll0,
>>>>  		.num_parents = ARRAY_SIZE(gcc_xo_gpll0),
>>>> -		.ops = &clk_rcg2_ops,
>>>> +		.ops = &clk_rcg2_ro_ops,
>>>>  	},
>>>>  };
>>>>  
>>>> @@ -306,7 +306,7 @@ static struct clk_rcg2 periph_noc_clk_src = {
>>>>  		.name = "periph_noc_clk_src",
>>>>  		.parent_data = gcc_xo_gpll0,
>>>>  		.num_parents = ARRAY_SIZE(gcc_xo_gpll0),
>>>> -		.ops = &clk_rcg2_ops,
>>>> +		.ops = &clk_rcg2_ro_ops,
>>>>  	},
>>>>  };
>>>>  
>>>
>>> If the rcg is read-only then it shouldn't need a .freq_tbl (the
>>> .recalc_rate() works without it). These clocks have one for some reason.
>> .get_parent needs it
>>
> 
> Hm? .get_parent uses the ->parent_map but not the ->freq_tbl as far as I
> can see. :)
Brainfart. I think the ftbls can be removed.

Konrad
> 
> Stephan