linux-kernel - Re: [PATCH] mips: pistachio: Determine SoC revision during boot

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Date:	Tue, 19 Apr 2016 11:27:40 +0100
From:	James Hartley <james.hartley@...tec.com>
To:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
	Ralf Baechle <ralf@...ux-mips.org>,
	Andrew Bresticker <abrestic@...omium.org>,
	Jonas Gorski <jogo@...nwrt.org>,
	James Hogan <james.hogan@...tec.com>
CC:	<linux-mips@...ux-mips.org>, <linux-kernel@...r.kernel.org>,
	Ionela Voinescu <ionela.voinescu@...tec.com>
Subject: Re: [PATCH] mips: pistachio: Determine SoC revision during boot

Hi Sergei

On 18/04/16 17:59, Sergei Shtylyov wrote:
> Hello.
>
> On 04/18/2016 05:24 PM, James Hartley wrote:
>
>> Now that there are different revisions of the Pistachio SoC
>> in circulation, add this information to the boot log to make
>> it easier for users to determine which hardware they have.
>>
>> Signed-off-by: James Hartley <james.hartley@...tec.com>
>> Signed-off-by: Ionela Voinescu <ionela.voinescu@...tec.com>
>>
>> diff --git a/arch/mips/pistachio/init.c b/arch/mips/pistachio/init.c
>> index 96ba2cc..48f8755 100644
>> --- a/arch/mips/pistachio/init.c
>> +++ b/arch/mips/pistachio/init.c
> [...]
>> @@ -24,9 +26,28 @@
>>   #include <asm/smp-ops.h>
>>   #include <asm/traps.h>
>>
>> +/*
>> + * Core revision register decoding
>> + * Bits 23 to 20: Major rev
>> + * Bits 15 to 8: Minor rev
>> + * Bits 7 to 0: Maintenance rev
>> + */
>> +#define PISTACHIO_CORE_REV_REG    0xB81483D0
>> +#define PISTACHIO_CORE_REV_A1    0x00100006
>> +#define PISTACHIO_CORE_REV_B0    0x00100106
>> +
>>   const char *get_system_type(void)
>>   {
>> -    return "IMG Pistachio SoC";
>> +    u32 core_rev;
>> +
>> +    core_rev = __raw_readl((const void *)PISTACHIO_CORE_REV_REG);
>> +
>> +    if (core_rev == PISTACHIO_CORE_REV_B0)
>> +        return "IMG Pistachio SoC (B0)";
>> +    else if (core_rev == PISTACHIO_CORE_REV_A1)
>> +        return "IMG_Pistachio SoC (A1)";
>> +    else
>> +        return "IMG_Pistachio SoC";
>
>    How about the *switch* instead?
Yes, that would be slightly more readable - I'll do that in V2.

Thanks for the review! 

James.
>
> [...]
>
> MBR, Sergei
>