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 049DD19D07A; Tue, 19 Nov 2024 09:13:58 +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=1732007639; cv=none; b=ctJKWtOmEbpPK5xMDgBFyFo4n9JARnlt9ZiZIODCZYTDlMVJCuCVSJlesAmial4doAmSiSiInhY7hNrkE6CFmSnRKanlIsNUaTlBaS2kvDeII4EpacUJnev02a2bD1z+qCvIhUIlZNaIKEKD0Aac/lE0lWBBVGwr0hWK6oL139Q= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1732007639; c=relaxed/simple; bh=2VZx2V9CVxqf2nW+fj+4T81hvTJdFCbYTV71NmDqQeg=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=dzOjjvtxR3JkeRTfyviMbUzgeLanQo88KriJztcmRkq5WwTqppmNNNdzmx6llKlMh8q1xR6V2YtsaYgzwuL2x/gbm26bIvRMDigMEP4lR/BmYziy3dA5bJ+AI3nVbPfd1MDedPx+qGrzjoIwZuhzQ7yexr2oCabowgDFPsKwx/I= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=CXqjVkof; 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="CXqjVkof" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2E438C4CECF; Tue, 19 Nov 2024 09:13:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1732007638; bh=2VZx2V9CVxqf2nW+fj+4T81hvTJdFCbYTV71NmDqQeg=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=CXqjVkofP/0q91qDo3Ommx4z8COey/ZCvwj/8e6JY14iGyYrPHZ2PSFQREUT02yJa rJajENc59J2Vbx3+4VgQZMoUKdL1xDjVDdkOM7tLgUFa4rLgji3BMGAan30Tx2mABY pW1L1aeuB4QHCA9QR+x1NuukkKDCpzjNTVrGore/0Pj+UgFIYYYgudZhjXKiTLw94Y uQGuN99ig4d1/EBV3ZaA0RvGBaOoSg0AmB/K0m1BGoK221mhtLTrnE4Lv67pweIj9/ PMjclUbrMePquPrs1Uv5BsedP9egllo/Rg4sNqUeKNMyWlL/07RdCbjc3huwC336Gf BdjN2M4Kq6IVA== Message-ID: <9f347e95-7ce1-4339-9ccb-6bf2962d09d0@kernel.org> Date: Tue, 19 Nov 2024 10:13:50 +0100 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 1/4] dt-bindindgs: i2c: qcom,i2c-geni: Document shared flag To: Mukesh Kumar Savaliya Cc: konrad.dybcio@linaro.org, andersson@kernel.org, andi.shyti@kernel.org, linux-arm-msm@vger.kernel.org, dmaengine@vger.kernel.org, linux-kernel@vger.kernel.org, linux-i2c@vger.kernel.org, conor+dt@kernel.org, agross@kernel.org, devicetree@vger.kernel.org, vkoul@kernel.org, linux@treblig.org, dan.carpenter@linaro.org, Frank.Li@nxp.com, konradybcio@kernel.org, bryan.odonoghue@linaro.org, krzk+dt@kernel.org, robh@kernel.org References: <20240927063108.2773304-1-quic_msavaliy@quicinc.com> <20240927063108.2773304-2-quic_msavaliy@quicinc.com> <6d81d8e7-ecd1-46f0-8ca3-617b5ee96990@quicinc.com> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzk@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 13/11/2024 17:08, Mukesh Kumar Savaliya wrote: > > > On 9/27/2024 2:54 PM, Krzysztof Kozlowski wrote: >> On Fri, Sep 27, 2024 at 12:01:05PM +0530, Mukesh Kumar Savaliya wrote: >>> Adds qcom,shared-se flag usage. Use this when particular I2C serial >>> controller needs to be shared between two subsystems. >>> >>> SE = Serial Engine, meant for I2C controller here. >>> TRE = Transfer Ring Element, refers to Queued Descriptor. >>> SS = Subsystems (APPS processor, Modem, TZ, ADSP etc). >>> >>> Example : >>> Two clients from different SS can share an I2C SE for same slave device >>> OR their owned slave devices. >>> Assume I2C Slave EEPROM device connected with I2C controller. >>> Each client from ADSP SS and APPS Linux SS can perform i2c transactions. >>> This gets serialized by lock TRE + DMA Transfers + Unlock TRE at HW level. >>> >>> Signed-off-by: Mukesh Kumar Savaliya >>> --- >>> Documentation/devicetree/bindings/i2c/qcom,i2c-geni-qcom.yaml | 4 ++++ >>> 1 file changed, 4 insertions(+) >>> >>> diff --git a/Documentation/devicetree/bindings/i2c/qcom,i2c-geni-qcom.yaml b/Documentation/devicetree/bindings/i2c/qcom,i2c-geni-qcom.yaml >>> index 9f66a3bb1f80..3b9b20a0edff 100644 >>> --- a/Documentation/devicetree/bindings/i2c/qcom,i2c-geni-qcom.yaml >>> +++ b/Documentation/devicetree/bindings/i2c/qcom,i2c-geni-qcom.yaml >>> @@ -60,6 +60,10 @@ properties: >>> power-domains: >>> maxItems: 1 >>> >>> + qcom,shared-se: >>> + description: True if I2C needs to be shared between two or more subsystems(SS). >> >> The "SS" and subsystem should be explained in the binding. Please do not >> use some qcom-specific abbreviations here, but explain exactly, e.g. >> processors like application processor and DSP. >> >> "se" is also not explained in the binding - please open it and look for >> such explanation. > Sure, i thought cover letter explanation is good enough. I will add it > per patch as cover letter will not be visible and go away after merge. >> >> This all should be rephrased to make it clear... We talked about this >> and I do not see much of improvements except commit msg, so we are >> making circles. I don't know, get someone internally to help you in >> upstreaming this. > Let me retry to make it better. > Will make SS (subsystem) to system processor (can be APPS or DSP OR any > other). >> >> Is sharing of IP blocks going to be also for other devices? If yes, then >> this should be one property for all Qualcomm devices. If not, then be >> sure that this is the case because I will bring it up if you come with >> one more solution for something else. >> > IP blocks like SE can be shared. Here we are talking about I2C sharing. > In future it can be SPI sharing. But design wise it fits better to add > flag per SE node. Same we shall be adding for SPI too in future. > > Please let me know your further suggestions. You responded 1.5 months after my message. I will provide you suggestions also 1.5 months, when I dig the context. Oh wait, all previous emails are long gone from my inbox... Anyway, my above comment stands for all Qualcomm reviews: stop coming up every month with twenty different "shared IP" properties. Best regards, Krzysztof