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Message-ID: <CABuKBeKnEw38sQYwrkheoWetZZcPTJhKRsBK4a62FS6-6dRFTA@mail.gmail.com>
Date:	Thu, 10 Apr 2014 10:29:48 +0200
From:	Matthias Brugger <matthias.bgg@...il.com>
To:	Gregory CLEMENT <gregory.clement@...e-electrons.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Mark Rutland <mark.rutland@....com>,
	Andrew Lunn <andrew@...n.ch>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	Thierry Reding <thierry.reding@...il.com>,
	Heiko Stübner <heiko.stuebner@...com>,
	Russell King <linux@....linux.org.uk>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Florian Vaussard <florian.vaussard@...l.ch>,
	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Jason Cooper <jason@...edaemon.net>,
	Pawel Moll <pawel.moll@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Rob Herring <robh+dt@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Randy Dunlap <rdunlap@...radead.org>,
	Silvio F <silvio.fricke@...il.com>,
	Kumar Gala <galak@...eaurora.org>,
	Olof Johansson <olof@...om.net>,
	Jonathan Cameron <jic23@...nel.org>
Subject: Re: [PATCH 3/4] arm: add basic support for Mediatek MT6589 boards

2014-04-09 22:26 GMT+02:00 Gregory CLEMENT <gregory.clement@...e-electrons.com>:
> 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@...il.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@...il.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?

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@...12000 {
>> +                     compatible = "arm,cortex-a9-gic";
>> +                     interrupt-controller;
>> +                     #interrupt-cells = <3>;
>> +                     reg = <0x10211000 0x1000>,
>> +                           <0x10212000 0x1000>;
>> +             };
>> +
>> +             L2: l2-cache-controller@...0e000 {
>> +                     compatible = "arm,pl310-cache";
>> +                     reg = <0x1020e000 0x1000>;
>> +                     cache-unified;
>> +                     cache-level = <2>;
>> +             };
>> +
>> +             timer: timer@...08000 {
>> +                     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@...il.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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