From mboxrd@z Thu Jan 1 00:00:00 1970 From: Derek Basehore Subject: [PATCH] arm64: dts: rockchip: Add 32k clk on rk3399-gru Date: Tue, 27 Nov 2018 15:23:31 -0800 Message-ID: <20181127232331.49628-1-dbasehore@chromium.org> Mime-Version: 1.0 Content-Transfer-Encoding: 8bit Return-path: Sender: linux-kernel-owner@vger.kernel.org To: linux-kernel@vger.kernel.org Cc: linux-rockchip@lists.infradead.org, linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, tony.xie@rock-chips.com, zyw@rock-chips.com, ayaka@soulik.info, nickey.yang@rock-chips.com, zhengsq@rock-chips.com, klaus.goger@theobroma-systems.com, dianders@chromium.org, briannorris@chromium.org, enric.balletbo@collabora.com, heiko@sntech.de, mark.rutland@arm.com, robh+dt@kernel.org, Derek Basehore List-Id: devicetree@vger.kernel.org This adds the 32k clock to the RK3399 Gru board file. Even though it's not directly used, muxes will end up traversing the entire clk tree on calls to determine_rate if it doesn't exist. This is because the 32k clk is listed as a possible parent on some clks. Since the clk doesn't know about the 32k clk (it was never registered), it triggers a global search for it. This can happen about 40 times per second, which isn't great for power. Signed-off-by: Derek Basehore --- arch/arm64/boot/dts/rockchip/rk3399-gru.dtsi | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/arch/arm64/boot/dts/rockchip/rk3399-gru.dtsi b/arch/arm64/boot/dts/rockchip/rk3399-gru.dtsi index ca07f6032200..a07aa4c570c0 100644 --- a/arch/arm64/boot/dts/rockchip/rk3399-gru.dtsi +++ b/arch/arm64/boot/dts/rockchip/rk3399-gru.dtsi @@ -14,6 +14,13 @@ stdout-path = "serial2:115200n8"; }; + ap_rtc_clk: ap-rtc-clk { + compatible = "fixed-clock"; + clock-frequency = <32768>; + clock-output-names = "xin32k"; + #clock-cells = <0>; + }; + /* * Power Tree * -- 2.20.0.rc0.387.gc7a69e6b6c-goog