linux-kernel - Re: [PATCH v4 1/3] drivers: amba: Updates to component identification for driver matching.

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Date:   Thu, 31 Jan 2019 16:53:10 +0530
From:   Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>
To:     Mike Leach <mike.leach@...aro.org>,
        linux-arm-kernel@...ts.infradead.org, coresight@...ts.linaro.org,
        linux-kernel@...r.kernel.org
Cc:     linux@...linux.org.uk, mathieu.poirier@...aro.org,
        suzuki.poulose@....com, arm@...nel.org
Subject: Re: [PATCH v4 1/3] drivers: amba: Updates to component identification
 for driver matching.

On 1/31/2019 5:10 AM, Mike Leach wrote:
> The CoreSight specification (ARM IHI 0029E), updates the ID register
> requirements for components on an AMBA bus, to cover both traditional
> ARM Primecell type devices, and newer CoreSight and other components.
> 
> The Peripheral ID (PID) / Component ID (CID) pair is extended in certain
> cases to uniquely identify components. CoreSight components related to
> a single function can share Peripheral ID values, and must be further
> identified using a Unique Component Identifier (UCI). e.g. the ETM, CTI,
> PMU and Debug hardware of the A35 all share the same PID.
> 
> Bits 15:12 of the CID are defined to be the device class.
> Class 0xF remains for PrimeCell and legacy components.
> Class 0x9 defines the component as CoreSight (CORESIGHT_CID above)
> Class 0x0, 0x1, 0xB, 0xE define components that do not have driver support
> at present.
> Class 0x2-0x8,0xA and 0xD-0xD are presently reserved.
> 
> The specification futher defines which classes of device use the standard
> CID/PID pair, and when additional ID registers are required.
> 
> This patch introduces the amba_cs_uci_id structure which will be used in
> all coresight drivers for indentification via the private data pointer in
> the amba_id structure.
> 
> Existing drivers that currently use the amba_id->data pointer for private
> data are updated to use the amba_cs_uci_id->data pointer. Macros and
> inline functions are added to simplify this code.
> 

Thanks Mike, this fixes STM probe with UCI change.

Tested-by: Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>

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