From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E1B141E52D; Wed, 4 Jun 2025 14:07:49 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1749046070; cv=none; b=t/PXdFiKjgPTYZb4pu1q/E3h1WD20gUcnWp5f9+L1VlFJxl1J4g+QKqOWM+NzoSHiURQ7jLRbBkLNlFrxyoscONmXHSkkrNSUNl+OGl+UahNqI5EpU/98kkB+W9nNMNsp04z57XxJrMje416KqhGEMK89JtZUTLER8n1ANBhmTk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1749046070; c=relaxed/simple; bh=b6xnqzpYhDmE6s6nfOyKsqfw46QpWokc7n3shvEH8eE=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=ONctVcK4F09+C5pAQXRJWQh99QiDcQLMBURSVjtefptBk9tNK00ekPJ+/piEpvKnY5duXR7N/CdjWEPTKiLxOgoOYNRhhv1v5DM4ns+/AKBm9mLhkjSPkz1KLkW/39sanWH5FcXZmjJz+GYgkt2Mu2740KjbD0RNJqa78oflVtc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=qGsYUtSw; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="qGsYUtSw" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 08C44C4CEE4; Wed, 4 Jun 2025 14:07:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1749046069; bh=b6xnqzpYhDmE6s6nfOyKsqfw46QpWokc7n3shvEH8eE=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=qGsYUtSwf16XeOcAzxtoTu8ey1M0HmLlDL0wk9MemHSHWIUKgo5LwAsy1akEtLCye wXbnF66y821mK49ulzh0fkdNghwDJOM+nqmLYrjnMpoux6dnhZENm1loJAXawIVGVj fZkFUrPM14uKPZrNRuuMKKlPeDcufHlgqumWvocceKk81jp5xk3qc77RqZ51SCp2Gf NWe+FEhQMeI+bjQazBCjHMD7RBbt9+Q0lg2dYZRTSJObz4BNwbw2YEpW2tf43V6tlp ZKIrnlrXon8J4EggkkhyJPS5Bh2R3ng6Dr8tvC90v39TohVNqZpXnMPWhAg1b0092S +NcN4Fn/mP6jQ== Message-ID: Date: Wed, 4 Jun 2025 16:07:43 +0200 Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 1/6] dt-bindings: crypto: Document support for SPAcc To: Pavitrakumar Managutte Cc: linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, herbert@gondor.apana.org.au, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, Ruud.Derwig@synopsys.com, manjunath.hadli@vayavyalabs.com, adityak@vayavyalabs.com, Bhoomika Kadabi References: <20250602053231.403143-1-pavitrakumarm@vayavyalabs.com> <20250602053231.403143-2-pavitrakumarm@vayavyalabs.com> <3570be5b-cb20-4259-9a9b-959098b902d0@kernel.org> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzk@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 04/06/2025 14:20, Pavitrakumar Managutte wrote: >> >>>>> + >>>>> + snps,vspacc-id: >>>>> + $ref: /schemas/types.yaml#/definitions/uint32 >>>>> + description: | >>>>> + Virtual SPAcc instance identifier. >>>>> + The SPAcc hardware supports multiple virtual instances (determined by >>>>> + ELP_SPACC_CONFIG_VSPACC_CNT parameter), and this ID is used to identify >>>>> + which virtual instance this node represents. >>>> >>>> No, IDs are not accepted. >>> >>> PK: This represents the specific virtual SPAcc that is being used in >>> the current configuration. It is used to index into the register banks >>> and the context memories of the virtual SPAcc that is being used. The >>> SPAcc IP can be configured as dedicated virtual SPAccs in >>> heterogeneous environments. >> >> OK. Why registers are not narrowed to only this instance? It feels like >> you provide here full register space for multiple devices and then >> select the bank with above ID. > > PK: No, we cant narrow the registers to only this instance since its > is just a single SPAcc with multiple virtual SPAcc instances. The same > set of registers(aka register banks) and context memories are > repeated, but sit at different offset addresses (i*4000 + > register-offsets). The crypto hardware engine inside is shared by all > the virtual SPAccs. This is very much for a heterogeneous computing > scenario. Then maybe you have one crypto engine? You ask us to guess all of this, also because you do not upstream the DTS for real product. Any mentioning of "virtual" already raises concerns... Best regards, Krzysztof