Re: [PATCH v4 1/6] clk: imx8m: Set CLK_GET_RATE_NOCACHE on dram clocks

[Leonard Crestez <leonard.crestez@nxp.com>]

On 12.11.2019 13:18, Abel Vesa wrote:
> On 19-11-09 00:39:51, Leonard Crestez wrote:
>> These clocks are only modified as part of DRAM frequency switches during
>> which DRAM itself is briefly inaccessible. The switch is performed with
>> a SMC call to by TF-A which runs from a SRAM area; upon returning to
>> linux several clocks bits are modified and we need to update them.
>>
>> For rate bits an easy solution is to just mark with
>> CLK_GET_RATE_NOCACHE so that new rates are always read back from
>> registers.
>>
>> Signed-off-by: Leonard Crestez <leonard.crestez@nxp.com>
>> ---
>>   drivers/clk/imx/clk-imx8mm.c | 11 +++++++++--
>>   drivers/clk/imx/clk-imx8mn.c | 12 ++++++++++--
>>   drivers/clk/imx/clk-imx8mq.c | 15 +++++++++++----
>>   3 files changed, 30 insertions(+), 8 deletions(-)

>> --- a/drivers/clk/imx/clk-imx8mn.c
>> +++ b/drivers/clk/imx/clk-imx8mn.c
>> @@ -428,12 +428,20 @@ static int imx8mn_clocks_probe(struct platform_device *pdev)
>>   	clks[IMX8MN_CLK_AHB] = imx8m_clk_composite_critical("ahb", imx8mn_ahb_sels, base + 0x9000);
>>   	clks[IMX8MN_CLK_AUDIO_AHB] = imx8m_clk_composite("audio_ahb", imx8mn_audio_ahb_sels, base + 0x9100);
>>   	clks[IMX8MN_CLK_IPG_ROOT] = imx_clk_divider2("ipg_root", "ahb", base + 0x9080, 0, 1);
>>   	clks[IMX8MN_CLK_IPG_AUDIO_ROOT] = imx_clk_divider2("ipg_audio_root", "audio_ahb", base + 0x9180, 0, 1);
>>   	clks[IMX8MN_CLK_DRAM_CORE] = imx_clk_mux2_flags("dram_core_clk", base + 0x9800, 24, 1, imx8mn_dram_core_sels, ARRAY_SIZE(imx8mn_dram_core_sels), CLK_IS_CRITICAL);
>> -	clks[IMX8MN_CLK_DRAM_ALT] = imx8m_clk_composite("dram_alt", imx8mn_dram_alt_sels, base + 0xa000);
>> -	clks[IMX8MN_CLK_DRAM_APB] = imx8m_clk_composite_critical("dram_apb", imx8mn_dram_apb_sels, base + 0xa080);
>> +
>> +	/*
>> +	 * DRAM clocks are manipulated from TF-A outside clock framework.
>> +	 * Mark with GET_RATE_NOCACHE to always read div value from hardware
>> +	 */
>> +	clks[IMX8MN_CLK_DRAM_ALT] = __imx8m_clk_composite("dram_alt", imx8mn_dram_alt_sels, base + 0xa000,
>> +			CLK_GET_RATE_NOCACHE);
>> +	clks[IMX8MN_CLK_DRAM_APB] = __imx8m_clk_composite("dram_apb", imx8mn_dram_apb_sels, base + 0xa080,
>> +			CLK_IS_CRITICAL | CLK_GET_RATE_NOCACHE);
> 
> nitpick: I think it looks better if we stick to one line each clock.
> I know it's against the 80 chars rule, but at least is consistent.

Yes, there are longer lines in the imx8m* files anyway.

If I fix this (in all instances) can I also add a "reviewed-by"?

--
Regards,
Leonard