linux-kernel - Re: [PATCH 1/3] include: dt-bindings: add Performance Monitoring Unit for Exynos

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Message-ID: <3fcb6dde-7ccc-4da6-5f8b-c8338edaa155@samsung.com>
Date:   Wed, 17 Apr 2019 17:10:38 +0900
From:   Chanwoo Choi <cw00.choi@...sung.com>
To:     Lukasz Luba <l.luba@...tner.samsung.com>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Cc:     b.zolnierkie@...sung.com, krzk@...nel.org, robh+dt@...nel.org,
        mark.rutland@....com, kyungmin.park@...sung.com,
        m.szyprowski@...sung.com, s.nawrocki@...sung.com,
        myungjoo.ham@...sung.com, kgene@...nel.org
Subject: Re: [PATCH 1/3] include: dt-bindings: add Performance Monitoring
 Unit for Exynos

Hi Lukasz,

On 19. 4. 17. 오후 4:48, Lukasz Luba wrote:
> This patch add support of a new feature which can be used in DT:
> Performance Monitoring Unit with defined event data type.
> In this patch the event data types are defined for Exynos PPMU.
> The patch also updates the MAINTAINERS file accordingly.
> 
> Signed-off-by: Lukasz Luba <l.luba@...tner.samsung.com>
> ---
>  MAINTAINERS                           |  5 +++++
>  include/dt-bindings/pmu/exynos_ppmu.h | 24 ++++++++++++++++++++++++
>  2 files changed, 29 insertions(+)
>  create mode 100644 include/dt-bindings/pmu/exynos_ppmu.h
> 
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 3671fde..f4aac78 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -12376,6 +12376,11 @@ L:	linux-scsi@...r.kernel.org
>  S:	Supported
>  F:	drivers/scsi/pm8001/
>  
> +PMU EXYNOS DT BINDINGS
> +M:	Lukasz Luba <l.luba@...tner.samsung.com>
> +S:	Maintained
> +F:	include/dt-bindings/pmu/exynos_ppmu.h
> +

IMHO, I'm not sure that it is right of adding one dt-binding header file
to MAINTAINERS file. If right, I'm OK.


>  PNP SUPPORT
>  M:	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>
>  S:	Maintained
> diff --git a/include/dt-bindings/pmu/exynos_ppmu.h b/include/dt-bindings/pmu/exynos_ppmu.h
> new file mode 100644
> index 0000000..a6971eb
> --- /dev/null
> +++ b/include/dt-bindings/pmu/exynos_ppmu.h
> @@ -0,0 +1,24 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Samsung Exynos PPMU event types for counting in regs
> + *
> + * Copyright (c) 2019, Samsung
> + * Author: Lukasz Luba <l.luba@...tner.samsung.com>
> + */
> +
> +#ifndef __DT_BINDINGS_PMU_EXYNOS_PPMU_H
> +#define __DT_BINDINGS_PMU_EXYNOS_PPMU_H
> +
> +
> +#define PPMU_RO_BUSY_CYCLE_CNT		0x0
> +#define PPMU_WO_BUSY_CYCLE_CNT		0x1
> +#define PPMU_RW_BUSY_CYCLE_CNT		0x2
> +#define PPMU_RO_REQUEST_CNT		0x3
> +#define PPMU_WO_REQUEST_CNT		0x4
> +#define PPMU_RO_DATA_CNT		0x5
> +#define PPMU_WO_DATA_CNT		0x6
> +#define PPMU_RO_LATENCY			0x12
> +#define PPMU_WO_LATENCY			0x16
> +#define PPMU_V2_EVT3_RW_DATA_CNT	0x22

If we can select the data type for monitoring, it looks good to me.
But, when I developed the Exynos PPMU, I has not tested other data type
except for PPMU_RO_DATA_CNT and PPMU_WO_DATA_CNT.

Do you test all data types with PPMU device?

> +
> +#endif
> 


-- 
Best Regards,
Chanwoo Choi
Samsung Electronics