Re: max310x: bug in driver when using MAX3107 with crystal

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Понедельник, 30 марта 2015, 8:12 +02:00 от Gaetan Hug <ghug@xxxxxxxxx>:
> Hello folks,
> 
>    I've been using the MAX3107 IC and I had to tweak a bit the driver 
> code to make things work. We use a crystal connected to the internal 
> crystal oscillator to generate the clock and the CLKSRC register was not 
> set properly. When using a crystal both bits alternatively select by 
> this line of code should be set:
> 
> max310x.c:574
> clksrc = xtal ? MAX310X_CLKSRC_CRYST_BIT : MAX310X_CLKSRC_EXTCLK_BIT;
> 
>    The MAX310X_CLKSRC_EXTCLK_BIT is named ClockEnable in the MAX3107 
> documentation (http://datasheets.maximintegrated.com/en/ds/MAX3107.pdf). 
> It actually connects / disconnects the clock signal  to the PLL block - 
> the signal being generated by either the crystal/oscillator pair or by 
> some other external source.
> 
>    As this driver needs to work with other devices that I would rather 
> not propose a patch.
> 
>    I would though be available to do some testing.

Hello.

MAX310X_CLKSRC_EXTCLK_BIT bit is valid only for MAX3107, this bit is reserved for
other ICs, so you can modify the code like as:

clksrc = xtal ? MAX310X_CLKSRC_CRYST_BIT : 0;
...
...
regmap_write(s->regmap, MAX310X_CLKSRC_REG, clksrc | MAX310X_CLKSRC_EXTCLK_BIT);

If such modification will be works fine, please send a patch to this mailing list.

Thanks.

---

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