linux-kernel - Re: [PATCH 1/3] Documentation: dt: keystone: provide SoC specific compatible flags

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Date:	Wed, 23 Sep 2015 14:05:39 -0400
From:	Murali Karicheri <m-karicheri2@...com>
To:	Nishanth Menon <nm@...com>, Santosh Shilimkar <ssantosh@...nel.org>
CC:	<devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 1/3] Documentation: dt: keystone: provide SoC specific
 compatible flags

On 09/22/2015 12:08 PM, Nishanth Menon wrote:
> Keystone2 devices are used on more platforms than just Texas
> Instruments reference evaluation platforms called EVMs. Providing a
> generic compatible "ti,keystone" is not sufficient to differentiate
> various SoC definitions possible on various platforms. So, provide
> compatible matches for each SoC family by itself.
>
> This allows SoC specific logic to be run time handled based on
> of_machine_is_compatible("ti,k2hk") or as needed for the dependent
> processor instead of needing to use board dependent compatibles that
> are needed now.
>
> Signed-off-by: Nishanth Menon <nm@...com>
> ---
>   .../devicetree/bindings/arm/keystone/keystone.txt    | 20 +++++++++++++++++---
>   1 file changed, 17 insertions(+), 3 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/arm/keystone/keystone.txt b/Documentation/devicetree/bindings/arm/keystone/keystone.txt
> index 59d7a46f85eb..800d2d02e27b 100644
> --- a/Documentation/devicetree/bindings/arm/keystone/keystone.txt
> +++ b/Documentation/devicetree/bindings/arm/keystone/keystone.txt
> @@ -9,12 +9,26 @@ Required properties:
>      the form "ti,keystone-*". Generic devices like gic, arch_timers, ns16550
>      type UART should use the specified compatible for those devices.
>
> +SoC families:
> +
> +- Keystone 2 generic SoC:
> +   compatible = "ti,keystone"
> +
> +SoCs:
> +
> +- Keystone 2 Hawking/Kepler
> +   compatible = ti,k2hk", "ti,keystone"
> +- Keystone 2 Lamarr
> +   compatible = ti,k2l", "ti,keystone"
> +- Keystone 2 Edison
> +   compatible = ti,k2e", "ti,keystone"
> +
>   Boards:
>   -  Keystone 2 Hawking/Kepler EVM
> -   compatible = "ti,k2hk-evm","ti,keystone"
> +   compatible = "ti,k2hk-evm", "ti,k2hk", "ti,keystone"
>
>   -  Keystone 2 Lamarr EVM
> -   compatible = "ti,k2l-evm","ti,keystone"
> +   compatible = "ti,k2l-evm", "ti, k2l", "ti,keystone"
>
>   -  Keystone 2 Edison EVM
> -   compatible = "ti,k2e-evm","ti,keystone"
> +   compatible = "ti,k2e-evm", "ti,k2e", "ti,keystone"
>
DTS takes care of the difference in the hardware and If there SoC 
specific customization required outside this, then it is best to include 
this as part of that change. In the past, I believe we didn't do it due 
to the same reason as above.

Murali

-- 
Murali Karicheri
Linux Kernel, Keystone
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