[PATCH] arm-soc: Add Sigma Designs Tango4 port

[Arnd Bergmann]

On Friday 02 October 2015 18:02:04 Mason wrote:
> Add support for Tango4-based SoCs (SMP8756, SMP8758)
> 
> Signed-off-by: Marc Gonzalez <marc_gonzalez at sigmadesigns.com>

Please write a proper changelog text here that tells us more about
the patch than the subject line.

> --- a/arch/arm/boot/dts/Makefile
> +++ b/arch/arm/boot/dts/Makefile
> @@ -605,6 +605,8 @@ dtb-$(CONFIG_MACH_SUN8I) += \
>  dtb-$(CONFIG_MACH_SUN9I) += \
>  	sun9i-a80-optimus.dtb \
>  	sun9i-a80-cubieboard4.dtb
> +dtb-$(CONFIG_ARCH_TANGOX) += \
> +	vantage-1172.dtb

This file name should start with the name of the chip,
e.g. 'tango4-vantage-1172.dtb', to make it easier to find.

> diff --git a/arch/arm/boot/dts/tango4.dtsi b/arch/arm/boot/dts/tango4.dtsi
> new file mode 100644
> index 000000000000..7336fcc3ac1d
> --- /dev/null
> +++ b/arch/arm/boot/dts/tango4.dtsi
> @@ -0,0 +1,117 @@
> +#include <dt-bindings/interrupt-controller/irq.h>
> +
> +/ {
> +	compatible = "sigma,tango4-soc";

Move the root comaptible strings into the board specific file,
and add the name of the machine as a more specific one.

> +
> +	soc {
> +		compatible = "simple-bus";
> +		#address-cells = <1>;
> +		#size-cells = <1>;
> +		ranges;
> +
> +		xtal_in_cnt {
> +			compatible = "sigma,xtal_in_cnt";
> +			reg = <0x10048 0x4>;
> +			clocks = <&xtal>;
> +		};
> +
> +		uart0 {
> +			compatible = "ralink,rt2880-uart";
> +			reg = <0x10700 0x100>;
> +			clock-frequency = <7372800>;
> +			reg-shift = <2>;
> +/*			fifo-size = <16>; BROKEN */
> +		};

Please use standard node names here, the uart should be
named 'serial at 10700', the other names should be
'ethernet at 26000', 'interrupt-controller at 6e000' etc.

If the SoC contains more than one UART, please list them all
here, and mark them as 'status="disabled"' in the .dtsi file,
then add the appropriate aliases and 'status="okay"' override
for the ones that are actually used on that board.

> +
> +		eth0: eth0 {
> +			compatible = "sigma,smp8640-emac";
> +			reg = <0x26000 0x800>;
> +			interrupts = <38 4>;
> +			interrupt-parent = <&irq0>;
> +			mac-address = [ 00 16 e8 02 08 42 ];
> +			clocks = <&sysclk>;
> +		};
> +
> +		intc: intc at e000 {
> +			compatible = "sigma,tango-intc";
> +			reg = <0x6e000 0x1000>;
> +			interrupt-parent = <&gic>;
> +			interrupt-controller;
> +			#address-cells = <1>;
> +			#size-cells = <1>;
> +
> +			irq0: irq0 at 000 {
> +				reg = <0x000 0x100>;
> +				interrupt-controller;
> +				#interrupt-cells = <2>;
> +				interrupts = <0 2 4>;
> +			};

You are missing a ranges property that describes what address
space these addresses are in.

> +			irq1: irq1 at 100 {
> +				reg = <0x100 0x100>;
> +				interrupt-controller;
> +				#interrupt-cells = <2>;
> +				interrupts = <0 3 4>;
> +			};
> +
> +			irq2: irq2 at 300 {
> +				reg = <0x300 0x100>;
> +				interrupt-controller;
> +				#interrupt-cells = <2>;
> +				interrupts = <0 4 4>;
> +			};
> +		};
> +	};
> +};
> diff --git a/arch/arm/boot/dts/vantage-1172.dts b/arch/arm/boot/dts/vantage-1172.dts
> new file mode 100644
> index 000000000000..56f6babe7093
> --- /dev/null
> +++ b/arch/arm/boot/dts/vantage-1172.dts
> @@ -0,0 +1,8 @@
> +/dts-v1/;
> +
> +#include "tango4.dtsi"
> +
> +&eth0 {
> +	phy-connection-type = "rgmii";
> +	max-speed = <1000>;
> +};

You should normally have /chosen and /aliases nodes here as well.

> diff --git a/arch/arm/mach-tangox/Kconfig b/arch/arm/mach-tangox/Kconfig
> new file mode 100644
> index 000000000000..152cdd487056
> --- /dev/null
> +++ b/arch/arm/mach-tangox/Kconfig
> @@ -0,0 +1,12 @@
> +# Tango3 was based on MIPS 74kf. Tango4 is based on ARM Cortex A9 MPCore.
> +
> +config ARCH_TANGOX
> +	bool "Sigma Designs Tango4 (SMP87xx)" if ARCH_MULTI_V7
> +	select ARCH_HAS_HOLES_MEMORYMODEL
> +	select ARM_ERRATA_754322
> +	select ARM_ERRATA_764369 if SMP
> +	select ARM_GIC
> +	select GENERIC_IRQ_CHIP
> +	select HAVE_ARM_SCU
> +	select HAVE_ARM_TWD
> +	select SERIAL_8250_RT288X if SERIAL_8250

Do not 'select' the uart driver, that can just be part of the defconfig
file.

	Arnd