Re: [PATCH 3/4] arm: add basic support for Mediatek MT6589 boards

From: Matthias Brugger
Date: Thu Apr 10 2014 - 04:30:12 EST

2014-04-09 22:26 GMT+02:00 Gregory CLEMENT <gregory.clement@xxxxxxxxxxxxxxxxxx>:
> 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@xxxxxxxxx>
>> ---
>> .../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@xxxxxxxxx>
>> + *
>> + * 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?

I don't have any common clock 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@xxxxxxxxx>
>> + *
>> + * 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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