[RESEND,PATCHv6 1/1] Add support for GMT G762/G763 PWM fan controllers

On Sun, Jun 16, 2013 at 12:36:20AM +0200, Arnaud Ebalard wrote:

GMT G762/763 fan speed PWM controller is connected directly to a fan
and performs closed-loop or open-loop control of the fan speed. Two
modes - PWM or DC - are supported by the chip. Introduced driver
provides various knobs to control the operations of the chip (via
sysfs interface). Specific characteristics of the system can be passed
either using board init code or via DT. Documentation for both the
driver and DT bindings are also provided.

Signed-off-by: Arnaud Ebalard <redacted>
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Hi Guenter,

In the end, I think handling the clock properly for DT path
(clk_prepare_enable() and associated clk_disable_unprepare()
for both error and module unloading) adds some code but I
do not see how to spare this. Comments welcome.

If you have additional comments and a new version is required,
I'll handle those with Simon's tests on its platform.

We might need to be more careful with the clocks. Several drivers
save the value retrieved with of_clk_get() and call clk_put()
afterwards. But some drivers don't do that, so I don't really
know the implications.

I'll look into it some more to make sure everything is correct.

Guenter