linux-kernel - Re: [PATCH v2 3/7] dt-bindings: reset: Add binding constants for BLZP1600

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Date: Wed, 24 Apr 2024 16:16:58 +0200
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Niko Pasaloukos <nikolaos.pasaloukos@...ize.com>,
 "linux-arm-kernel@...ts.infradead.org"
 <linux-arm-kernel@...ts.infradead.org>,
 "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Cc: James Cowgill <james.cowgill@...ize.com>,
 Matt Redfearn <matthew.redfearn@...ize.com>,
 Neil Jones <neil.jones@...ize.com>, Philipp Zabel <p.zabel@...gutronix.de>,
 Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>,
 "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH v2 3/7] dt-bindings: reset: Add binding constants for
 BLZP1600

On 24/04/2024 15:32, Niko Pasaloukos wrote:
> Add SCMI reset numbers according to the Blaize BLZP1600 SoC
> hardware specifications.
> 
> Reviewed-by: James Cowgill <james.cowgill@...ize.com>
> Reviewed-by: Matt Redfearn <matt.redfearn@...ize.com>
> Reviewed-by: Neil Jones <neil.jones@...ize.com>
> Signed-off-by: Nikolaos Pasaloukos <nikolaos.pasaloukos@...ize.com>
> ---
>  .../dt-bindings/reset/blaize,blzp1600-reset.h | 84 +++++++++++++++++++
>  1 file changed, 84 insertions(+)
>  create mode 100644 include/dt-bindings/reset/blaize,blzp1600-reset.h

This goes with patch adding the binding doc.

> 
> diff --git a/include/dt-bindings/reset/blaize,blzp1600-reset.h b/include/dt-bindings/reset/blaize,blzp1600-reset.h
> new file mode 100644
> index 000000000000..c500c2b0690c
> --- /dev/null
> +++ b/include/dt-bindings/reset/blaize,blzp1600-reset.h
> @@ -0,0 +1,84 @@
> +/* SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause */
> +/*
> + * Copyright (C) 2023, Blaize, Inc.
> + */
> +
> +#ifndef DT_BINDING_RESET_BLZP1600_H
> +#define DT_BINDING_RESET_BLZP1600_H
> +
> +/* ARM SCMI resets */
> +
> +/* BLZP1600 reset numbers as defined in the hardware architecture */
> +
> +#define BLZP1600_A53_C0_HARD_RST 0
> +#define BLZP1600_A53_C0_SOFT_RST 1
> +#define BLZP1600_A53_C1_HARD_RST 2
> +#define BLZP1600_A53_C1_SOFT_RST 3
> +#define BLZP1600_A53_L2_CACHE_RST 4
> +#define BLZP1600_A53_DBG_RST 5
> +#define BLZP1600_GIC_RST 6
> +#define BLZP1600_CRYPTO_RST 7
> +/* reset 8 invalid */

Same concerns.

However another problem is lack of users of it. Your patchset looks
random - this goes to subsustem, but there is no device binding, no
driver, no DTS. Could be result of lack of threading. :/

Best regards,
Krzysztof