linux-kernel - Re: [PATCH] reset-socfpga: Fix nr

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Date:   Wed, 15 Feb 2017 09:57:50 -0600
From:   Dinh Nguyen <dinguyen@...nsource.altera.com>
To:     Philipp Zabel <p.zabel@...gutronix.de>,
        Rojhalat Ibrahim <imr@...chenk.de>
CC:     <linux-fpga@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] reset-socfpga: Fix nr_resets property



On 02/15/2017 08:57 AM, Philipp Zabel wrote:
> [Added Dinh to Cc:]
> 
> On Wed, 2017-02-15 at 14:06 +0100, Rojhalat Ibrahim wrote:
>> The SoC-FPGA reset controller driver defines NR_BANKS as 4 and uses that define
>> for two unrelated purposes. It is used
>> 1. as an increment for reset line banks which are 32-bit registers with 4-byte
>> aligned addresses.
>> 2. as the total number of reset line banks which together with the number of
>> resets per bank (32) limits the total number of useable resets to 96 and the
>> highest useable reset ID to 95.
>> This is clearly wrong as there are resets with higher IDs than 95 defined in
> 
> 128 and 127, respectively.
> 
>> include/dt-bindings/reset/altr,rst-mgr.h and altr,rst-mgr-a10.h.
>>
>> The patch introduces a new define BANK_INCREMENT for calculating the register
>> addresses as before and increases NR_BANKS to 6 for useable reset IDs up to 191.
> 
> Actually, looking at the Arria 10 TRM, it looks like there are
> mpumodrst, per0modrst, per1modrst, brgmodrst, sysmodrst, coldmodrst,
> nrstmodrst, and dbgmodrst registers on that SoC, which would mean
> NR_BANKS should be changed to 8. Dinh, what do you think?
> 

Yes, I agree. Should be 8. Thanks for the patch!

Dinh