From mboxrd@z Thu Jan 1 00:00:00 1970 From: kever.yang@rock-chips.com (Kever Yang) Date: Wed, 15 Oct 2014 10:23:01 -0700 Subject: [PATCH v5 2/6] ARM: rockchip: add option to access the pmu via a phandle in smp_operations In-Reply-To: <1413393785-26783-1-git-send-email-kever.yang@rock-chips.com> References: <1413393785-26783-1-git-send-email-kever.yang@rock-chips.com> Message-ID: <1413393785-26783-3-git-send-email-kever.yang@rock-chips.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org From: Heiko Stuebner 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: Heiko Stuebner Signed-off-by: Kever Yang --- Changes in v5: None Changes in v4: - add rockchip,pmu property into cpus.txt Changes in v3: - add this patch Changes in v2: None Documentation/devicetree/bindings/arm/cpus.txt | 9 +++++++++ arch/arm/mach-rockchip/platsmp.c | 13 +++++++++++++ 2 files changed, 22 insertions(+) diff --git a/Documentation/devicetree/bindings/arm/cpus.txt b/Documentation/devicetree/bindings/arm/cpus.txt index fc44634..b2aacbe 100644 --- a/Documentation/devicetree/bindings/arm/cpus.txt +++ b/Documentation/devicetree/bindings/arm/cpus.txt @@ -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: + Definition: Specifies the syscon node controlling the cpu core + power domains. + Example 1 (dual-cluster big.LITTLE system 32-bit): cpus { diff --git a/arch/arm/mach-rockchip/platsmp.c b/arch/arm/mach-rockchip/platsmp.c index 4c36fbf..57b53b3 100644 --- a/arch/arm/mach-rockchip/platsmp.c +++ b/arch/arm/mach-rockchip/platsmp.c @@ -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; -- 1.9.1