From mboxrd@z Thu Jan 1 00:00:00 1970 From: Brian Norris Subject: Re: [PATCH] arm64: dts: rockchip: Explicitly set pclk_pmu_src on rk3399 Date: Mon, 29 Aug 2016 11:18:42 -0700 Message-ID: <20160829181841.GA8682@localhost> References: <1472494284-11315-1-git-send-email-dianders@chromium.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <1472494284-11315-1-git-send-email-dianders-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org> Sender: devicetree-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Douglas Anderson Cc: Heiko Stuebner , linux-rockchip-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, zhengxing-TNX95d0MmH7DzftRWevZcw@public.gmane.org, robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org, mark.rutland-5wv7dgnIgG8@public.gmane.org, catalin.marinas-5wv7dgnIgG8@public.gmane.org, will.deacon-5wv7dgnIgG8@public.gmane.org, wxt-TNX95d0MmH7DzftRWevZcw@public.gmane.org, jay.xu-TNX95d0MmH7DzftRWevZcw@public.gmane.org, zhangqing-TNX95d0MmH7DzftRWevZcw@public.gmane.org, david.wu-TNX95d0MmH7DzftRWevZcw@public.gmane.org, yamada.masahiro-uWyLwvC0a2jby3iVrkZq2A@public.gmane.org, devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-Id: devicetree@vger.kernel.org On Mon, Aug 29, 2016 at 11:11:24AM -0700, Doug Anderson wrote: > On rk3399 we explicitly set ppll in the device tree to 676000000. The > ppll has one major child, pclk_pmu_src, that is the parent of lots of > other clocks. Right now nobody is setting that clock rate and we're > relying on the divider to just happen to be something sane. Let's be > explicit in our request so we're not relying on the firmware. > > With the current firmware I tested with this patch has no expected > impact but it's probably good to do anyway. > > Signed-off-by: Douglas Anderson > --- > arch/arm64/boot/dts/rockchip/rk3399.dtsi | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/arch/arm64/boot/dts/rockchip/rk3399.dtsi b/arch/arm64/boot/dts/rockchip/rk3399.dtsi > index 62d450935a57..ffb3faa8c176 100644 > --- a/arch/arm64/boot/dts/rockchip/rk3399.dtsi > +++ b/arch/arm64/boot/dts/rockchip/rk3399.dtsi > @@ -908,8 +908,8 @@ > reg = <0x0 0xff750000 0x0 0x1000>; > #clock-cells = <1>; > #reset-cells = <1>; > - assigned-clocks = <&pmucru PLL_PPLL>; > - assigned-clock-rates = <676000000>; > + assigned-clocks = <&pmucru PLL_PPLL>, <&pmucru PCLK_SRC_PMU>; > + assigned-clock-rates = <676000000>, <112666667>; I think this makes sense and is a good idea. One alternative would be to have the various children actually set a rate that they expect, but several of them don't have a separate driver at all, and that would be of dubious value anyway I think. Reviewed-by: Brian Norris > }; > > cru: clock-controller@ff760000 { > -- > 2.8.0.rc3.226.g39d4020 > -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html