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

[Gregory CLEMENT <gregory.clement@free-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@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