linux-kernel - Re: [PATCH v2 1/7] iommu/arm-smmu-v3: Introduce SMMU option PAGE0_REGS

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Date:   Thu, 4 May 2017 17:32:33 +0100
From:   Mark Rutland <mark.rutland@....com>
To:     Geetha sowjanya <gakula@...iumnetworks.com>
Cc:     will.deacon@....com, robin.murphy@....com,
        lorenzo.pieralisi@....com, hanjun.guo@...aro.org,
        sudeep.holla@....com, iommu@...ts.linux-foundation.org,
        Geetha Sowjanya <geethasowjanya.akula@...ium.com>,
        jcm@...hat.com, linu.cherian@...ium.com,
        linux-kernel@...r.kernel.org, geethasowjanya.akula@...il.com,
        linux-acpi@...r.kernel.org, robert.richter@...ium.com,
        catalin.marinas@....com, sgoutham@...ium.com,
        linux-arm-kernel@...ts.infradead.org, Charles.Garcia-Tobin@....com
Subject: Re: [PATCH v2 1/7] iommu/arm-smmu-v3: Introduce SMMU option
 PAGE0_REGS_ONLY

On Thu, May 04, 2017 at 06:05:33PM +0530, Geetha sowjanya wrote:
> From: Linu Cherian <linu.cherian@...ium.com>
> 
> Cavium ThunderX2 SMMU implementation doesn't support page 1 register space
> and PAGE0_REGS_ONLY option will be enabled as an errata workaround.
> 
> This option when turned on, replaces all page 1 offsets used for
> EVTQ_PROD/CONS, PRIQ_PROD/CONS register access with page 0 offsets.
> 
> Signed-off-by: Linu Cherian <linu.cherian@...ium.com>
> Signed-off-by: Geetha Sowjanya <geethasowjanya.akula@...ium.com>
> ---
>  drivers/iommu/arm-smmu-v3.c | 44 ++++++++++++++++++++++++++++++++------------
>  1 file changed, 32 insertions(+), 12 deletions(-)

>  static struct arm_smmu_option_prop arm_smmu_options[] = {

> +	{ ARM_SMMU_OPT_PAGE0_REGS_ONLY, "cavium-cn99xx,broken-page1-regspace"},

No patch in this series documented the new property.

Please update Documentation/devicetree/bindings/iommu/arm,smmu-v3.txt,
with a description of the property. i.e. what it describes, and when it
should be set.

Please either make that a prepatory path, or merge it in with this one.

Thanksm
Mark.