From mboxrd@z Thu Jan 1 00:00:00 1970 From: Philipp Zabel Subject: [RFC PATCH 0/4] i.MX6 PU power domain support Date: Tue, 11 Feb 2014 14:27:07 +0100 Message-ID: <1392125231-28387-1-git-send-email-p.zabel@pengutronix.de> Return-path: Sender: devicetree-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Shawn Guo Cc: Rob Herring , Mark Rutland , kernel-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org, linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Philipp Zabel List-Id: devicetree@vger.kernel.org The i.MX6Q can gate off the CPU and PU (GPU/VPU) power domains using the Power Gating Controller (PGC) in the GPC register space. The CPU power domain is already handled by wait state code, but the PU power domain can be controlled using the generic power domain framework and power off the PU supply regulator if all devices in the power domain are (runtime) suspended. This patchset adds a GPC platform device initialized at subsys_initcall time (after anatop regulators) that binds to the gpc device tree node and sets up the PU power domain: gpc: gpc@020dc000 { #address-cells = <1>; #size-cells = <1>; compatible = "fsl,imx6q-gpc"; reg = <0x020dc000 0x4000>; interrupts = <0 89 0x04 0 90 0x04>; pu-supply = <®_pu>; pd_pu: power-domain@020dc260 { compatible = "fsl,power-domain"; reg = <0x020dc260 0x10>; }; }; It registers a platform bus notifier so that it can add GPU and VPU devices to the power domain when they are bound. If finds devices to be added to the power domain by scanning the device tree for nodes that contain a power-domain = <&pd_pu>; property. For i.MX6QDL there is only one power domain, but on i.MX6SL I suspect the DISP power domain could be handled using the same mechanism. regards Philipp Philipp Zabel (4): ARM: imx6: gpc: Add PU power domain for GPU/VPU ARM: imx6: gpc: Add pm clock support to PU power domain ARM: dts: imx6qdl: Allow disabling the PU regulator, add a enable ramp delay ARM: dts: imx6qdl: Add PU power-domain information to gpc node arch/arm/boot/dts/imx6qdl.dtsi | 11 +- arch/arm/mach-imx/Kconfig | 2 + arch/arm/mach-imx/gpc.c | 243 +++++++++++++++++++++++++++++++++++++++++ 3 files changed, 255 insertions(+), 1 deletion(-) -- 1.8.5.3 -- 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