From: sudeep.holla@arm•com (Sudeep Holla)
To: linux-arm-kernel@lists•infradead.org
Subject: [PATCH v2 6/6] arm64: renesas: r8a7795: Add L2 cache-controller nodes
Date: Wed, 9 Dec 2015 17:16:58 +0000 [thread overview]
Message-ID: <5668620A.9070908@arm.com> (raw)
In-Reply-To: <56685DBE.8030001@gmail.com>
On 09/12/15 16:58, Dirk Behme wrote:
> On 08.12.2015 20:16, Mark Rutland wrote:
[...]
>>
>> With the other properties from ePAPR you can acquire information on the
>> geometry of the cache, which cannot be acquired from architected
>> registers.
>
>
> Just for my understanding: Yes, if other properties from ePAPR like
> geometry of the cache are added to the device tree l2 cache entries then
> it makes sense to have them.
>
> But an "empty" entry like the one given in the example above doesn't
> make much sense and could be removed without loosing any functionality?
>
No they are required to detect the cache hierarchy as there's no
architectural way of detecting the same.
> It looks to me that most of the L2 entries we have in
> arch/arm64/boot/dts are such "empty" entries.
>
True *so far*, we have not seen a case where we need to override the
values read in a architectural way.
--
Regards,
Sudeep
next prev parent reply other threads:[~2015-12-09 17:16 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-12-07 18:24 [PATCH v2 0/6] ARM/arm64 : shmobile/renesas: Add L2 cache-controller nodes Geert Uytterhoeven
2015-12-07 18:24 ` [PATCH v2 1/6] ARM: shmobile: r8a73a4 dtsi: " Geert Uytterhoeven
2015-12-07 18:24 ` [PATCH v2 2/6] ARM: shmobile: r8a7790 " Geert Uytterhoeven
2015-12-07 18:24 ` [PATCH v2 3/6] ARM: shmobile: r8a7791 dtsi: Add L2 cache-controller node Geert Uytterhoeven
2015-12-07 18:24 ` [PATCH v2 4/6] ARM: shmobile: r8a7793 " Geert Uytterhoeven
2015-12-07 18:24 ` [PATCH v2 5/6] ARM: shmobile: r8a7794 " Geert Uytterhoeven
2015-12-07 18:24 ` [PATCH v2 6/6] arm64: renesas: r8a7795: Add L2 cache-controller nodes Geert Uytterhoeven
2015-12-07 18:49 ` Sudeep Holla
2015-12-07 19:03 ` Mark Rutland
2015-12-07 20:18 ` Geert Uytterhoeven
2015-12-15 8:45 ` Geert Uytterhoeven
2015-12-08 18:50 ` Dirk Behme
2015-12-08 18:58 ` Sudeep Holla
2015-12-08 19:16 ` Mark Rutland
2015-12-09 16:58 ` Dirk Behme
2015-12-09 17:16 ` Sudeep Holla [this message]
2015-12-09 17:21 ` Mark Rutland
2015-12-09 17:34 ` Sudeep Holla
2016-02-15 1:58 ` [PATCH v2 0/6] ARM/arm64 : shmobile/renesas: " Simon Horman
2016-02-15 10:15 ` Geert Uytterhoeven
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