W dniu 11.06.2015 o 21:15, Javier Martinez Canillas pisze:
> Hello Krzysztof,
>
> On Thu, Jun 11, 2015 at 12:43 PM, Krzysztof Kozlowski
> <k.kozlowski@xxxxxxxxxxx> wrote:
>> W dniu 11.06.2015 o 17:26, Krzysztof Kozlowski pisze:
>>> Add proper gate clock for the Analog to Digital Converter (ADC) on
>>> Exynos4x12.
>>>
>>> Signed-off-by: Krzysztof Kozlowski <k.kozlowski@xxxxxxxxxxx>
>>> ---
>>> drivers/clk/samsung/clk-exynos4.c | 3 +++
>>> include/dt-bindings/clock/exynos4.h | 5 ++++-
>>> 2 files changed, 7 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/drivers/clk/samsung/clk-exynos4.c b/drivers/clk/samsung/clk-exynos4.c
>>> index 714d6ba782c8..5f32410a01f8 100644
>>> --- a/drivers/clk/samsung/clk-exynos4.c
>>> +++ b/drivers/clk/samsung/clk-exynos4.c
>>> @@ -85,6 +85,7 @@
>>> #define DIV_PERIL4 0xc560
>>> #define DIV_PERIL5 0xc564
>>> #define E4X12_DIV_CAM1 0xc568
>>> +#define E4X12_GATE_BUS_FSYS1 0xc744
>>> #define GATE_SCLK_CAM 0xc820
>>> #define GATE_IP_CAM 0xc920
>>> #define GATE_IP_TV 0xc924
>>> @@ -1095,6 +1096,8 @@ static struct samsung_gate_clock exynos4x12_gate_clks[] __initdata = {
>>> 0),
>>> GATE(CLK_PPMUIMAGE, "ppmuimage", "aclk200", E4X12_GATE_IP_IMAGE, 9, 0,
>>> 0),
>>> + GATE(CLK_PCLK_ADC, "pclk_adc", "aclk133", E4X12_GATE_BUS_FSYS1, 16, 0,
>>> + 0),
>>
>> Now I have even simpler idea. Don't add new clock id but just define
>> here the CLK_TSADC as:
>> GATE(CLK_TSADC, "tsadc", "aclk133", E4X12_GATE_BUS_FSYS1, 16, 0, 0);
>>
>> With this change the second patch wouldn't be needed however this does
>> not reflect the Exynos 4x12 datasheet.
>>
>> Any comments?
>>
>
> I think it's better to reflect the datasheet so I prefer your original
> patch.
Yeah, I also like sticking to datasheet but maybe it is not always worth
to reproduce the datasheet in 100%. It is just thinking out loud.
> Also, wouldn't changing the CLK_TSADC gate definition cause a
> regression on an Exynos4210 board that is using the tsadc clock? or
> maybe I misunderstood the explanation of your Patch 2/2?
No, no. The Exynos4210 would be unchanged. It has the CLK_TSADC - both
in hardware and in kernel driver. The Exynos4x12 SoCs don't have so we can:
1. Add new CLK_PCLK_ADC (id and clock) reflecting datasheet.
2. Add only CLK_TSADC clock on Exynos4x12 which will be using the
register of PCLK_ADC. The id would stay the same as on Exynos4210.
Best regards,
Krzysztof
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