linux-kernel - Re: [RFC 5/5] powerpc/fsl: Add supported-irq-ranges for P2020

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Date:   Tue, 07 Aug 2018 16:13:58 -0500
From:   Scott Wood <oss@...error.net>
To:     Bharat Bhushan <Bharat.Bhushan@....com>, benh@...nel.crashing.org,
        paulus@...ba.org, mpe@...erman.id.au, galak@...nel.crashing.org,
        mark.rutland@....com, kstewart@...uxfoundation.org,
        gregkh@...uxfoundation.org, devicetree@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Cc:     robh@...nel.org, keescook@...omium.org, tyreld@...ux.vnet.ibm.com,
        joe@...ches.com
Subject: Re: [RFC 5/5] powerpc/fsl: Add supported-irq-ranges for P2020

On Fri, 2018-07-27 at 15:18 +0530, Bharat Bhushan wrote:
> MPIC on NXP (Freescale) P2020 supports following irq
> ranges:
>   > 0 - 11      (External interrupt)
>   > 16 - 79     (Internal interrupt)
>   > 176 - 183   (Messaging interrupt)
>   > 224 - 231   (Shared message signaled interrupt)

Why don't you convert to the 4-cell interrupt specifiers that make dealing
with these ranges less error-prone?

> diff --git a/arch/powerpc/platforms/85xx/mpc85xx_rdb.c
> b/arch/powerpc/platforms/85xx/mpc85xx_rdb.c
> index 1006950..49ff348 100644
> --- a/arch/powerpc/platforms/85xx/mpc85xx_rdb.c
> +++ b/arch/powerpc/platforms/85xx/mpc85xx_rdb.c
> @@ -57,6 +57,11 @@ void __init mpc85xx_rdb_pic_init(void)
>  			MPIC_BIG_ENDIAN |
>  			MPIC_SINGLE_DEST_CPU,
>  			0, 256, " OpenPIC  ");
> +	} else if (of_machine_is_compatible("fsl,P2020RDB-PC")) {
> +		mpic = mpic_alloc(NULL, 0,
> +		  MPIC_BIG_ENDIAN |
> +		  MPIC_SINGLE_DEST_CPU,
> +		  0, 0, " OpenPIC  ");
>  	} else {
>  		mpic = mpic_alloc(NULL, 0,
>  		  MPIC_BIG_ENDIAN |

I don't think we want to grow a list of every single revision of every board
in these platform files.

-Scott