Re: [PATCH v2 0/6] ARM: STi reset controller support

[Philipp Zabel <p.zabel@pengutronix.de>]

Hi Srinivas,

Am Montag, den 03.02.2014, 14:27 +0000 schrieb
srinivas.kandagatla@st.com:
> From: Srinivas Kandagatla <srinivas.kandagatla@st.com>
> 
> Hi All,
> 
> This patch series adds reset controller support for STi SOC series STiH415 and
> STiH416. It adds support for both power down reset and soft reset controllers.
> On STi series SOCs reset lines are wired up to system configuration registers.
> Most of the IPs on STi SOCs are left in reset state, so this driver is very
> important for other drivers to use the IPs.
> 
> Patch 01: Adds reset controller based on system configuration registers via
> regmap.
> 
> Patch 02, 03: adds STiH415 and STiH416 reset controller drivers.
> 
> Patch 04, 05: adds STiH415 and STiH416 soft reset controllers.
> 
> The final patch 06 selects reset controller in mach-sti Kconfig.
> 
> I would like get this driver in to 3.15, so that its possible to add dt
> support for other IPs with reset lines. Without this patchset its impossible
> to add DT support to IPs with reset lines as reset line definition is in
> common header file in include/dt-bindings/.
> 
> This reset controller will be used by gmac, i2c and st-ir drivers.
> 
> 
> Comments?

the patchset looks good to me for the soft resets. But for the powerdown
bits I am wondering whether the reset controller API is the right
abstraction. Depending on whether those bits really just put the IPs
into reset or there is some power gating / sequencing involved,
shouldn't this rather be handled as a set of pm domains?
I see that for example on STiH415 there are both soft resets and
powerdown bits for USB[012].

regards
Philipp