From 2bb8ad9b44c528a7f8c0e9120b85b9ecc69b2bbe Mon Sep 17 00:00:00 2001 From: Arnd Bergmann Date: Fri, 18 Jul 2014 18:58:57 +0200 Subject: iio: exynos-adc: add experimental touchscreen support This adds support for the touchscreen on Samsung s3c64xx. The driver is completely untested but shows roughly how it could be done, following the example of the at91 driver. compared to the old plat-samsung/adc driver, there is no support for prioritizing ts over other clients, nor for oversampling. From my reading of the code, the priorities didn't actually have any effect at all, but the oversampling might be needed. Verifying this driver is the main issue that is currently holding up multiplatform support for s3c64xx, so any help in testing is very much appreciated. The current version uses the IS_REACHABLE() that is going to be introduced in the linux-media tree, please comment this out for testing. Signed-off-by: Arnd Bergmann Acked-by: Dmitry Torokhov --- Documentation/devicetree/bindings/arm/samsung/exynos-adc.txt | 3 +++ 1 file changed, 3 insertions(+) (limited to 'Documentation/devicetree') diff --git a/Documentation/devicetree/bindings/arm/samsung/exynos-adc.txt b/Documentation/devicetree/bindings/arm/samsung/exynos-adc.txt index f46ca9a316a2..ccaaec6014bd 100644 --- a/Documentation/devicetree/bindings/arm/samsung/exynos-adc.txt +++ b/Documentation/devicetree/bindings/arm/samsung/exynos-adc.txt @@ -47,6 +47,9 @@ Required properties: - samsung,syscon-phandle Contains the PMU system controller node (To access the ADC_PHY register on Exynos5250/5420/5800/3250) +Optional properties: +- has-touchscreen: If present, indicates that a touchscreen is + connected an usable. Note: child nodes can be added for auto probing from device tree. -- cgit v1.2.3 From 5420b4b156179ec634d9e42279b6898b85852960 Mon Sep 17 00:00:00 2001 From: Linus Walleij Date: Fri, 9 Oct 2015 13:38:57 +0200 Subject: ARM: realview: add an DT SMP boot method This adds an SMP boot method for the ARM RealView reference designs. We also select HAVE_SMP by default and make it use SMP_ON_UP so we only need to support one single kernel across the RealView reference designs when using DT. The RealViews need to have the SCU (Snoop Control Unit) activated on boot, and this is now done by looking up its address from the device tree and initializing it and counting the available cores. The RealViews boot by using a magic address register in the system controller (SYS_FLAGS) to store the boot address, the ROM will then read this register to the PC when the CPUs are taken out of WFI. This code uses a handle to the syscon regmap to access this register. Signed-off-by: Linus Walleij --- Documentation/devicetree/bindings/arm/cpus.txt | 1 + arch/arm/mach-realview/Kconfig | 2 + arch/arm/mach-realview/Makefile | 2 +- arch/arm/mach-realview/platsmp-dt.c | 91 ++++++++++++++++++++++++++ 4 files changed, 95 insertions(+), 1 deletion(-) create mode 100644 arch/arm/mach-realview/platsmp-dt.c (limited to 'Documentation/devicetree') diff --git a/Documentation/devicetree/bindings/arm/cpus.txt b/Documentation/devicetree/bindings/arm/cpus.txt index 3a07a87fef20..19af9157f094 100644 --- a/Documentation/devicetree/bindings/arm/cpus.txt +++ b/Documentation/devicetree/bindings/arm/cpus.txt @@ -190,6 +190,7 @@ nodes to be present and contain the properties described below. "allwinner,sun6i-a31" "allwinner,sun8i-a23" "arm,psci" + "arm,realview-smp" "brcm,brahma-b15" "marvell,armada-375-smp" "marvell,armada-380-smp" diff --git a/arch/arm/mach-realview/Kconfig b/arch/arm/mach-realview/Kconfig index edbc925e42c2..7316fff0f3ba 100644 --- a/arch/arm/mach-realview/Kconfig +++ b/arch/arm/mach-realview/Kconfig @@ -5,11 +5,13 @@ config REALVIEW_DT bool "Support RealView(R) Device Tree based boot" select ARM_GIC select CLK_SP810 + select HAVE_SMP select ICST select MFD_SYSCON select POWER_RESET select POWER_RESET_VERSATILE select POWER_SUPPLY + select SMP_ON_UP select SOC_REALVIEW select USE_OF help diff --git a/arch/arm/mach-realview/Makefile b/arch/arm/mach-realview/Makefile index e07fdf7ae8a7..a46fa694cf07 100644 --- a/arch/arm/mach-realview/Makefile +++ b/arch/arm/mach-realview/Makefile @@ -3,7 +3,7 @@ # obj-y := core.o -obj-$(CONFIG_REALVIEW_DT) += realview-dt.o +obj-$(CONFIG_REALVIEW_DT) += realview-dt.o platsmp-dt.o obj-$(CONFIG_MACH_REALVIEW_EB) += realview_eb.o obj-$(CONFIG_MACH_REALVIEW_PB11MP) += realview_pb11mp.o obj-$(CONFIG_MACH_REALVIEW_PB1176) += realview_pb1176.o diff --git a/arch/arm/mach-realview/platsmp-dt.c b/arch/arm/mach-realview/platsmp-dt.c new file mode 100644 index 000000000000..65585392655b --- /dev/null +++ b/arch/arm/mach-realview/platsmp-dt.c @@ -0,0 +1,91 @@ +/* + * Copyright (C) 2015 Linus Walleij + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ +#include +#include +#include +#include +#include +#include + +#include +#include +#include + +#include + +#include "core.h" + +#define REALVIEW_SYS_FLAGSSET_OFFSET 0x30 + +static const struct of_device_id realview_scu_match[] = { + { .compatible = "arm,arm11mp-scu", }, + { .compatible = "arm,cortex-a9-scu", }, + { .compatible = "arm,cortex-a5-scu", }, + { } +}; + +static const struct of_device_id realview_syscon_match[] = { + { .compatible = "arm,core-module-integrator", }, + { .compatible = "arm,realview-eb-syscon", }, + { .compatible = "arm,realview-pb11mp-syscon", }, + { .compatible = "arm,realview-pbx-syscon", }, + { }, +}; + +static void __init realview_smp_prepare_cpus(unsigned int max_cpus) +{ + struct device_node *np; + void __iomem *scu_base; + struct regmap *map; + unsigned int ncores; + int i; + + np = of_find_matching_node(NULL, realview_scu_match); + if (!np) { + pr_err("PLATSMP: No SCU base address\n"); + return; + } + scu_base = of_iomap(np, 0); + of_node_put(np); + if (!scu_base) { + pr_err("PLATSMP: No SCU remap\n"); + return; + } + + scu_enable(scu_base); + ncores = scu_get_core_count(scu_base); + pr_info("SCU: %d cores detected\n", ncores); + for (i = 0; i < ncores; i++) + set_cpu_possible(i, true); + iounmap(scu_base); + + /* The syscon contains the magic SMP start address registers */ + np = of_find_matching_node(NULL, realview_syscon_match); + if (!np) { + pr_err("PLATSMP: No syscon match\n"); + return; + } + map = syscon_node_to_regmap(np); + if (IS_ERR(map)) { + pr_err("PLATSMP: No syscon regmap\n"); + return; + } + /* Put the boot address in this magic register */ + regmap_write(map, REALVIEW_SYS_FLAGSSET_OFFSET, + virt_to_phys(versatile_secondary_startup)); +} + +struct smp_operations realview_dt_smp_ops __initdata = { + .smp_prepare_cpus = realview_smp_prepare_cpus, + .smp_secondary_init = versatile_secondary_init, + .smp_boot_secondary = versatile_boot_secondary, +#ifdef CONFIG_HOTPLUG_CPU + .cpu_die = realview_cpu_die, +#endif +}; +CPU_METHOD_OF_DECLARE(realview_smp, "arm,realview-smp", &realview_dt_smp_ops); -- cgit v1.2.3