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Date:   Thu, 11 Apr 2019 21:27:13 +0200
From:   Heiko Stübner <>
To:     Douglas Anderson <>
Cc:     Michael Turquette <>,
        Stephen Boyd <>,
        Caesar Wang <>,,,, Elaine Zhang <>,,,
Subject: Re: [PATCH 2/3] clk: rockchip: Make rkpwm a critical clock on rk3288

Am Dienstag, 9. April 2019, 22:47:06 CEST schrieb Douglas Anderson:
> Most rk3288-based boards are derived from the EVB and thus use a PWM
> regulator for the logic rail.  However, most rk3288-based boards don't
> specify the PWM regulator in their device tree.  We'll deal with that
> by making it critical.
> NOTE: it's important to make it critical and not just IGNORE_UNUSED
> because all PWMs in the system share the same clock.  We don't want
> another PWM user to turn the clock on and off and kill the logic rail.
> This change is in preparation for actually having the PWMs in the
> rk3288 device tree actually point to the proper PWM clock.  Up until
> now they've all pointed to the clock for the old IP block and they've
> all worked due to the fact that rkpwm was IGNORE_UNUSED and that the
> clock rates for both clocks were the same.
> Signed-off-by: Douglas Anderson <>

applied for 5.2
I've added a comment line describing the pwm-reg reason.


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