linux-kernel - Re: [PATCH v2] mtd: parsers: bcm63xx: simplify CFE detection

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Date:   Thu, 11 Jun 2020 08:42:42 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Álvaro Fernández Rojas <noltari@...il.com>,
        Miquel Raynal <miquel.raynal@...tlin.com>
Cc:     tsbogend@...ha.franken.de, Florian Fainelli <f.fainelli@...il.com>,
        bcm-kernel-feedback-list@...adcom.com, richard@....at,
        vigneshr@...com, Jonas Gorski <jonas.gorski@...il.com>,
        linus.walleij@...aro.org, linux-mips@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-mtd@...ts.infradead.org
Subject: Re: [PATCH v2] mtd: parsers: bcm63xx: simplify CFE detection



On 6/11/2020 8:16 AM, Álvaro Fernández Rojas wrote:
> Hi Miquel,
> 
>> El 11 jun 2020, a las 9:55, Miquel Raynal <miquel.raynal@...tlin.com> escribió:
>>
>> Hi Álvaro,
>>
>> Álvaro Fernández Rojas <noltari@...il.com> wrote on Mon,  8 Jun 2020
>> 18:06:49 +0200:
>>
>>> Instead of trying to parse CFE version string, which is customized by some
>>> vendors, let's just check that "CFE1" was passed on argument 3.
>>>
>>> Signed-off-by: Álvaro Fernández Rojas <noltari@...il.com>
>>> Signed-off-by: Jonas Gorski <jonas.gorski@...il.com>
>>> ---
>>> v2: use CFE_EPTSEAL definition and avoid using an additional funtion.
>>>
>>> drivers/mtd/parsers/bcm63xxpart.c | 29 ++++-------------------------
>>> 1 file changed, 4 insertions(+), 25 deletions(-)
>>>
>>> diff --git a/drivers/mtd/parsers/bcm63xxpart.c b/drivers/mtd/parsers/bcm63xxpart.c
>>> index 78f90c6c18fd..493a75b2f266 100644
>>> --- a/drivers/mtd/parsers/bcm63xxpart.c
>>> +++ b/drivers/mtd/parsers/bcm63xxpart.c
>>> @@ -22,6 +22,9 @@
>>> #include <linux/mtd/partitions.h>
>>> #include <linux/of.h>
>>>
>>> +#include <asm/bootinfo.h>
>>> +#include <asm/fw/cfe/cfe_api.h>
>>
>> Are you sure both includes are needed?
> 
> asm/bootinfo.h is needed for fw_arg3 and asm/fw/cfe/cfe_api.h is needed for CFE_EPTSEAL.
> 
>>
>> I don't think it is a good habit to include asm/ headers, are you sure
>> there is not another header doing it just fine?
> 
> Both are needed unless you want to add another definition of CFE_EPTSEAL value.
> There are currently two CFE magic definitions, the one in asm/fw/cfe/cfe_api.h and another one in bcm47xxpart.c:
> https://github.com/torvalds/linux/blob/master/arch/mips/include/asm/fw/cfe/cfe_api.h#L28
> https://github.com/torvalds/linux/blob/master/drivers/mtd/parsers/bcm47xxpart.c#L33

The caveat with that approach is that this reduces the compilation
surface to MIPS and BMIPS_GENERIC and BCM63XX only, which is a bit
small. If we could move the CFE definitions to a shared header, and
consolidate the value used by bcm47xxpart.c as well, that would allow us
to build the bcm63xxpart.c file with COMPILE_TEST on other
architectures. This does not really have functional value, but for
maintainers like Miquel, it allows them to quickly test their entire
drivers/mtd/ directory.
-- 
Florian