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Commit 6de2d21a authored by Heiko Stuebner's avatar Heiko Stuebner
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ARM: rockchip: add option to access the pmu via a phandle in smp_operations 



Makes it possible to define a rockchip,pmu phandle in the cpus node directly
referencing the pmu syscon instead of searching for specific compatible.

The old way of finding the pmu stays of course available.

Signed-off-by: default avatarKever Yang <kever.yang@rock-chips.com>
Tested-by: default avatarKevin Hilman <khilman@linaro.org>
Signed-off-by: default avatarHeiko Stuebner <heiko@sntech.de>
parent d003b58c

Documentation/devicetree/bindings/arm/cpus.txt

+9 −0
Original line number Diff line number Diff line
@@ -227,6 +227,15 @@ nodes to be present and contain the properties described below. 
			# List of phandles to idle state nodes supported

			  by this cpu [3].



	- rockchip,pmu

		Usage: optional for systems that have an "enable-method"

		       property value of "rockchip,rk3066-smp"

		       While optional, it is the preferred way to get access to

		       the cpu-core power-domains.

		Value type: <phandle>

		Definition: Specifies the syscon node controlling the cpu core

			    power domains.



Example 1 (dual-cluster big.LITTLE system 32-bit):



	cpus {

arch/arm/mach-rockchip/platsmp.c

+13 −0
Original line number Diff line number Diff line
@@ -155,6 +155,19 @@ static int __init rockchip_smp_prepare_pmu(void) 
	struct device_node *node;

	void __iomem *pmu_base;



	/*

	 * This function is only called via smp_ops->smp_prepare_cpu().

	 * That only happens if a "/cpus" device tree node exists

	 * and has an "enable-method" property that selects the SMP

	 * operations defined herein.

	 */

	node = of_find_node_by_path("/cpus");



	pmu = syscon_regmap_lookup_by_phandle(node, "rockchip,pmu");

	of_node_put(node);

	if (!IS_ERR(pmu))

		return 0;



	pmu = syscon_regmap_lookup_by_compatible("rockchip,rk3066-pmu");

	if (!IS_ERR(pmu))

		return 0;