Re: [PATCH 1/2] ARM: dts: bcm5301x: Add BCM SVK DT files

[Hauke Mehrtens <hauke@hauke-m.de>]

On 10/03/2015 12:22 AM, Jon Mason wrote:
> Add device tree files for Broadcom Northstar based SVKs.  Since the
> bcm5301x.dtsi already exists, all that is necessary is the dts files to
> enable the UARTs (and specify the RAM size for the 4708/9).  With these
> files, the SVKs are able to boot to shell.
> 
> Signed-off-by: Jon Mason <jonmason@broadcom.com>
> ---
>  arch/arm/boot/dts/Makefile       |  5 +++-
>  arch/arm/boot/dts/bcm94708.dts   | 52 +++++++++++++++++++++++++++++++++++
>  arch/arm/boot/dts/bcm94709.dts   | 52 +++++++++++++++++++++++++++++++++++
>  arch/arm/boot/dts/bcm953012k.dts | 59 ++++++++++++++++++++++++++++++++++++++++
>  4 files changed, 167 insertions(+), 1 deletion(-)
>  create mode 100644 arch/arm/boot/dts/bcm94708.dts
>  create mode 100644 arch/arm/boot/dts/bcm94709.dts
>  create mode 100644 arch/arm/boot/dts/bcm953012k.dts
> 
> diff --git a/arch/arm/boot/dts/Makefile b/arch/arm/boot/dts/Makefile
> index 233159d..96a1b58 100644
> --- a/arch/arm/boot/dts/Makefile
> +++ b/arch/arm/boot/dts/Makefile
> @@ -72,7 +72,10 @@ dtb-$(CONFIG_ARCH_BCM_5301X) += \
>  	bcm47081-buffalo-wzr-900dhp.dtb \
>  	bcm4709-asus-rt-ac87u.dtb \
>  	bcm4709-buffalo-wxr-1900dhp.dtb \
> -	bcm4709-netgear-r8000.dtb
> +	bcm4709-netgear-r8000.dtb \
> +	bcm94708.dtb \
> +	bcm94709.dtb \
> +	bcm953012k.dtb
>  dtb-$(CONFIG_ARCH_BCM_63XX) += \
>  	bcm963138dvt.dtb
>  dtb-$(CONFIG_ARCH_BCM_CYGNUS) += \
> diff --git a/arch/arm/boot/dts/bcm94708.dts b/arch/arm/boot/dts/bcm94708.dts
> new file mode 100644
> index 0000000..57a74c6
> --- /dev/null
> +++ b/arch/arm/boot/dts/bcm94708.dts

Currently the files are named beginning with the chip name something
like this should fit better the other naming schema:
arch/arm/boot/dts/bcm4708-brcm-bcm94708.dts

> @@ -0,0 +1,52 @@
> +/*
> + *  BSD LICENSE
> + *
> + *  Copyright(c) 2015 Broadcom Corporation.  All rights reserved.
> + *
> + *  Redistribution and use in source and binary forms, with or without
> + *  modification, are permitted provided that the following conditions
> + *  are met:
> + *
> + *    * Redistributions of source code must retain the above copyright
> + *      notice, this list of conditions and the following disclaimer.
> + *    * Redistributions in binary form must reproduce the above copyright
> + *      notice, this list of conditions and the following disclaimer in
> + *      the documentation and/or other materials provided with the
> + *      distribution.
> + *    * Neither the name of Broadcom Corporation nor the names of its
> + *      contributors may be used to endorse or promote products derived
> + *      from this software without specific prior written permission.
> + *
> + *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
> + *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
> + *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
> + *  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
> + *  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
> + *  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
> + *  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
> + *  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
> + *  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
> + *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
> + *  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
> + */
> +
> +/dts-v1/;
> +
> +#include "bcm5301x.dtsi"
> +
> +/ {
> +	model = "NorthStar SVK (BCM94708)";
> +	compatible = "brcm,bcm4708";

The compatible string should also contain this exactly board like this:
compatible = "brcm,bcm94708", "brcm,bcm4708";

> +
> +	aliases {
> +		serial0 = &uart0;
> +	};
> +
> +	chosen {
> +		bootargs = "console=ttyS0,115200 mem=128M";

Instead of using mem=128M you should add an extra node like this:

	memory {
		reg = <0x00000000 0x08000000>;
	};

Does this board only has 128M of RAM? currently we restrict all of them
to that, but I just want to know.

> +	};
> +};
> +
> +&uart0 {
> +	status = "okay";
> +};
> diff --git a/arch/arm/boot/dts/bcm94709.dts b/arch/arm/boot/dts/bcm94709.dts
> new file mode 100644
> index 0000000..bf4b6e1
> --- /dev/null
> +++ b/arch/arm/boot/dts/bcm94709.dts
> @@ -0,0 +1,52 @@
> +/*
> + *  BSD LICENSE
> + *
> + *  Copyright(c) 2015 Broadcom Corporation.  All rights reserved.
> + *
> + *  Redistribution and use in source and binary forms, with or without
> + *  modification, are permitted provided that the following conditions
> + *  are met:
> + *
> + *    * Redistributions of source code must retain the above copyright
> + *      notice, this list of conditions and the following disclaimer.
> + *    * Redistributions in binary form must reproduce the above copyright
> + *      notice, this list of conditions and the following disclaimer in
> + *      the documentation and/or other materials provided with the
> + *      distribution.
> + *    * Neither the name of Broadcom Corporation nor the names of its
> + *      contributors may be used to endorse or promote products derived
> + *      from this software without specific prior written permission.
> + *
> + *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
> + *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
> + *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
> + *  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
> + *  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
> + *  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
> + *  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
> + *  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
> + *  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
> + *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
> + *  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
> + */
> +
> +/dts-v1/;
> +
> +#include "bcm5301x.dtsi"
> +
> +/ {
> +	model = "NorthStar SVK (BCM94709)";
> +	compatible = "brcm,bcm4709", "brcm,bcm4708";
Better this:
compatible = "brcm,bcm94709", "brcm,bcm4709", "brcm,bcm4708";

> +
> +	aliases {
> +		serial0 = &uart0;
> +	};
> +
> +	chosen {
> +		bootargs = "console=ttyS0,115200 mem=128M";
same as above.

> +	};
> +};
> +
> +&uart0 {
> +	status = "okay";
> +};
> diff --git a/arch/arm/boot/dts/bcm953012k.dts b/arch/arm/boot/dts/bcm953012k.dts
> new file mode 100644
> index 0000000..1726ba0
> --- /dev/null
> +++ b/arch/arm/boot/dts/bcm953012k.dts
> @@ -0,0 +1,59 @@
> +/*
> + *  BSD LICENSE
> + *
> + *  Copyright(c) 2015 Broadcom Corporation.  All rights reserved.
> + *
> + *  Redistribution and use in source and binary forms, with or without
> + *  modification, are permitted provided that the following conditions
> + *  are met:
> + *
> + *    * Redistributions of source code must retain the above copyright
> + *      notice, this list of conditions and the following disclaimer.
> + *    * Redistributions in binary form must reproduce the above copyright
> + *      notice, this list of conditions and the following disclaimer in
> + *      the documentation and/or other materials provided with the
> + *      distribution.
> + *    * Neither the name of Broadcom Corporation nor the names of its
> + *      contributors may be used to endorse or promote products derived
> + *      from this software without specific prior written permission.
> + *
> + *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
> + *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
> + *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
> + *  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
> + *  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
> + *  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
> + *  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
> + *  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
> + *  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
> + *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
> + *  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
> + */
> +
> +/dts-v1/;
> +
> +#include "bcm5301x.dtsi"
> +
> +/ {
> +	model = "NorthStar SVK (BCM953012K)";
> +	compatible = "brcm,bcm5301k", "brcm,bcm4708";

same as other file.

> +
> +	aliases {
> +		serial0 = &uart0;
> +		serial1 = &uart1;
> +	};
> +
> +	chosen {
> +		bootargs = "console=ttyS0,115200";

Why is no memory size given here at all?

> +	};
> +};
> +
> +&uart0 {
> +	clock-frequency = <62499840>;

Just out of curiosity on what does this clock frequency depend? I saw
your patch adding a real clock driver which should make this obsolete.

> +	status = "okay";
> +};
> +
> +&uart1 {
> +	clock-frequency = <62499840>;
> +	status = "okay";
> +};
>