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SubjectRe: [PATCH 3/4] arm: add basic support for Mediatek MT6589 boards
Hi Matthias,

On 09/04/2014 19:45, Matthias Brugger wrote:
> This adds a generic devicetree board file and a dtsi for boards
> based on the MT6589 SoCs from Mediatek.
>
> Apart from the generic parts (gic, clocks) the only component
> currently supported are the timers.
>
> Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>
> ---
> .../devicetree/bindings/vendor-prefixes.txt | 1 +
> arch/arm/Kconfig | 2 +
> arch/arm/Makefile | 1 +
> arch/arm/boot/dts/mtk6589.dtsi | 105 ++++++++++++++++++++
> arch/arm/mach-mediatek/Kconfig | 14 +++
> arch/arm/mach-mediatek/Makefile | 1 +
> arch/arm/mach-mediatek/mediatek.c | 40 ++++++++
> 7 files changed, 164 insertions(+)
> create mode 100644 arch/arm/boot/dts/mtk6589.dtsi
> create mode 100644 arch/arm/mach-mediatek/Kconfig
> create mode 100644 arch/arm/mach-mediatek/Makefile
> create mode 100644 arch/arm/mach-mediatek/mediatek.c
>
> diff --git a/Documentation/devicetree/bindings/vendor-prefixes.txt b/Documentation/devicetree/bindings/vendor-prefixes.txt
> index 0f01c9b..af48801 100644
> --- a/Documentation/devicetree/bindings/vendor-prefixes.txt
> +++ b/Documentation/devicetree/bindings/vendor-prefixes.txt
> @@ -67,6 +67,7 @@ linux Linux-specific binding
> lsi LSI Corp. (LSI Logic)
> marvell Marvell Technology Group Ltd.
> maxim Maxim Integrated Products
> +mediatek MediaTek Inc.
> microchip Microchip Technology Inc.
> mosaixtech Mosaix Technologies, Inc.
> moxa Moxa
> diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
> index 5db05f6a..04d46ec 100644
> --- a/arch/arm/Kconfig
> +++ b/arch/arm/Kconfig
> @@ -995,6 +995,8 @@ source "arch/arm/mach-mv78xx0/Kconfig"
>
> source "arch/arm/mach-imx/Kconfig"
>
> +source "arch/arm/mach-mediatek/Kconfig"
> +
> source "arch/arm/mach-mxs/Kconfig"
>
> source "arch/arm/mach-netx/Kconfig"
> diff --git a/arch/arm/Makefile b/arch/arm/Makefile
> index 41c1931..8ce9774 100644
> --- a/arch/arm/Makefile
> +++ b/arch/arm/Makefile
> @@ -170,6 +170,7 @@ machine-$(CONFIG_ARCH_MSM) += msm
> machine-$(CONFIG_ARCH_MV78XX0) += mv78xx0
> machine-$(CONFIG_ARCH_MVEBU) += mvebu
> machine-$(CONFIG_ARCH_MXC) += imx
> +machine-$(CONFIG_ARCH_MEDIATEK) += mediatek
> machine-$(CONFIG_ARCH_MXS) += mxs
> machine-$(CONFIG_ARCH_NETX) += netx
> machine-$(CONFIG_ARCH_NOMADIK) += nomadik
> diff --git a/arch/arm/boot/dts/mtk6589.dtsi b/arch/arm/boot/dts/mtk6589.dtsi
> new file mode 100644
> index 0000000..6dbb74f
> --- /dev/null
> +++ b/arch/arm/boot/dts/mtk6589.dtsi
> @@ -0,0 +1,105 @@
> +/*
> + * Copyright (c) 2014 MundoReader S.L.
> + * Author: Matthias Brugger <matthias.bgg@gmail.com>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + */
> +
> +#include <dt-bindings/interrupt-controller/irq.h>
> +#include <dt-bindings/interrupt-controller/arm-gic.h>
> +#include "skeleton.dtsi"
> +
> +/ {
> + compatible = "mediatek,mt6589";
> + interrupt-parent = <&gic>;
> +
> + cpus {
> + #address-cells = <1>;
> + #size-cells = <0>;
> +
> + cpu@0 {
> + device_type = "cpu";
> + compatible = "arm,cortex-a7";
> + next-level-cache = <&L2>;
> + reg = <0x0>;
> + };
> + cpu@1 {
> + device_type = "cpu";
> + compatible = "arm,cortex-a7";
> + next-level-cache = <&L2>;
> + reg = <0x1>;
> + };
> + cpu@2 {
> + device_type = "cpu";
> + compatible = "arm,cortex-a7";
> + next-level-cache = <&L2>;
> + reg = <0x2>;
> + };
> + cpu@3 {
> + device_type = "cpu";
> + compatible = "arm,cortex-a7";
> + next-level-cache = <&L2>;
> + reg = <0x3>;
> + };
> +
> + };
> +
> + clocks {
> + #address-cells = <1>;
> + #size-cells = <1>;
> + ranges;
> +
> + system_clk: system_clk {
> + compatible = "fixed-clock";
> + clock-frequency = <13000000>;
> + #clock-cells = <0>;
> + clock-output-names = "system_clk";
> + };

Is it really a fixed clock without any parent, or do you
declare it as a fixed clock because you don't have any clock
common framework support yet?

> +
> + rtc_clk: rtc_clk {
> + compatible = "fixed-clock";
> + clock-frequency = <32000>;
> + #clock-cells = <0>;
> + clock-output-names = "rtc_clk";
> + };
> + };
> +
> + soc {
> + #address-cells = <1>;
> + #size-cells = <1>;
> + compatible = "simple-bus";
> + clock-ranges;
> + ranges;
> +
> + gic: interrupt-controller@10212000 {
> + compatible = "arm,cortex-a9-gic";
> + interrupt-controller;
> + #interrupt-cells = <3>;
> + reg = <0x10211000 0x1000>,
> + <0x10212000 0x1000>;
> + };
> +
> + L2: l2-cache-controller@1020e000 {
> + compatible = "arm,pl310-cache";
> + reg = <0x1020e000 0x1000>;
> + cache-unified;
> + cache-level = <2>;
> + };
> +
> + timer: timer@10008000 {
> + compatible = "mediatek,mtk6589-timer";
> + reg = <0x10008000 0x80>;
> + interrupts = <GIC_SPI 113 IRQ_TYPE_LEVEL_LOW>;
> + clocks = <&system_clk>, <&rtc_clk>;
> + clock-names = "sys_clk", "rtc_clk";
> + };
> + };
> +};
> diff --git a/arch/arm/mach-mediatek/Kconfig b/arch/arm/mach-mediatek/Kconfig
> new file mode 100644
> index 0000000..c0139ca
> --- /dev/null
> +++ b/arch/arm/mach-mediatek/Kconfig
> @@ -0,0 +1,14 @@
> +config ARCH_MEDIATEK
> + bool "Mediatek MT6589 SoC" if ARCH_MULTI_V7
> + select ARCH_REQUIRE_GPIOLIB
> + select ARM_GIC
> + select CACHE_L2X0
> + select HAVE_ARM_TWD if LOCAL_TIMERS

LOCAL_TIMERS no longer exist

> + select HAVE_SMP
> + select LOCAL_TIMERS if SMP
ditto

so what about this instead:

select HAVE_ARM_TWD if SMP


The rest of this patch looks good.

Thanks,

Gregory

> + select COMMON_CLK
> + select GENERIC_CLOCKEVENTS
> + select MTK_TIMER
> + select CLKSRC_MMIO
> + help
> + Support for Mediatek Cortex-A7 Quad-Core-SoC MT6589.
> diff --git a/arch/arm/mach-mediatek/Makefile b/arch/arm/mach-mediatek/Makefile
> new file mode 100644
> index 0000000..43e619f
> --- /dev/null
> +++ b/arch/arm/mach-mediatek/Makefile
> @@ -0,0 +1 @@
> +obj-$(CONFIG_ARCH_MEDIATEK) += mediatek.o
> diff --git a/arch/arm/mach-mediatek/mediatek.c b/arch/arm/mach-mediatek/mediatek.c
> new file mode 100644
> index 0000000..f630403
> --- /dev/null
> +++ b/arch/arm/mach-mediatek/mediatek.c
> @@ -0,0 +1,40 @@
> +/*
> + * Device Tree support for Mediatek SoCs
> + *
> + * Copyright (c) 2014 MundoReader S.L.
> + * Author: Matthias Brugger <matthias.bgg@gmail.com>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/init.h>
> +#include <linux/of_platform.h>
> +#include <linux/irqchip.h>
> +#include <asm/mach/arch.h>
> +#include <asm/mach/map.h>
> +#include <asm/hardware/cache-l2x0.h>
> +
> +static void __init mediatek_dt_init(void)
> +{
> + l2x0_of_init(0, ~0);
> + of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
> +}
> +
> +static const char * const mediatek_board_dt_compat[] = {
> + "mediatek,mt6589",
> + NULL,
> +};
> +
> +DT_MACHINE_START(MEDIATEK_DT, "Mediatek Cortex-A7 (Device Tree)")
> + .init_machine = mediatek_dt_init,
> + .dt_compat = mediatek_board_dt_compat,
> +MACHINE_END
>


--
Gregory Clement, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com


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