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 9695C179BC; Wed, 29 Jan 2025 07:23:21 +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=1738135401; cv=none; b=mERMxDbeTd2CxoQX4PY1pQenjSpdztM+McT/q5b7LHyc6ECCP2yfbeBPRXj8f1W8q85Pd+zhJuLvKuV3HIfesdWpe3r5HOyh5umA3Xhkjgq7gcJJVOgcIR0RYSuvBdk4sCo1gcFDN3aTr5TZJ4Xr6nAdIh4oIWwJYVFimJLdIR0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1738135401; c=relaxed/simple; bh=kR13aShW7NSxrR47PS4dl1AYXDYzkrNK0af2e/a3Hus=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=f6tAdfEIewI7RjRMsrANq/6OzQ6/+8EXihSXBwiq9Z0UORZNouP3tGdJgaulY17CHl42YSGAXu9iD1EwwGZEmCQNoXyU4oYp9v41HZbKG1INgMYahsLuBF1c0JasEFebg0H/DqbkcroRUnve35F6JtUe1TW/92cMCW5Il0yKU3c= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=JWJ2Xg8J; 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="JWJ2Xg8J" Received: by smtp.kernel.org (Postfix) with ESMTPSA id BA529C4CED3; Wed, 29 Jan 2025 07:23:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1738135401; bh=kR13aShW7NSxrR47PS4dl1AYXDYzkrNK0af2e/a3Hus=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=JWJ2Xg8JcLOAYf56B0Pt6w3kBd7kuhHJRetiuZpQQRvf9h/ZBJNUnlTg2jWc7Dy3F 5yh6j0NQ7MFxYx3szDV2SnahgOleuKwxdSPz+zO6RcLsfbbP9dj4MYkkwCLHFnYNmy DaQ5Ahx/o7VD4ZvjMaGR37zckQvH3kKKI+bGVTYBqTmI0zLgHYfg4Q9oCxg2F8YXDw CtHgAcztTQIyaYyIDn86XVYRymAS16MVaNKIzJskFlpr+n2sBwUHTyU7/yYtzmzjtY ZSCQvluc74hrmKxh6Bf3mQHMj+A2bmilCfp8pwBVhXjnF9DpfT5UOd9rQU/OceIO5I Ou95L5rdLdong== Message-ID: Date: Wed, 29 Jan 2025 08:23:12 +0100 Precedence: bulk X-Mailing-List: linux-spi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 4/8] dt-bindings: serial: Add support for selecting data transfer mode To: Dmitry Baryshkov Cc: Viken Dadhaniya , andi.shyti@kernel.org, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, gregkh@linuxfoundation.org, jirislaby@kernel.org, broonie@kernel.or, andersson@kernel.org, konradybcio@kernel.org, johan+linaro@kernel.org, dianders@chromium.org, agross@kernel.org, linux-arm-msm@vger.kernel.org, linux-i2c@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-serial@vger.kernel.org, linux-spi@vger.kernel.org, quic_msavaliy@quicinc.com, quic_anupkulk@quicinc.com References: <20250124105309.295769-1-quic_vdadhani@quicinc.com> <20250124105309.295769-5-quic_vdadhani@quicinc.com> <10060d39-87a4-4565-a2a6-80c93ac2266a@kernel.org> <374e16d6-46aa-4bdf-85e9-bc2e33c38057@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 29/01/2025 03:21, Dmitry Baryshkov wrote: > On Mon, Jan 27, 2025 at 05:24:21PM +0100, Krzysztof Kozlowski wrote: >> On 27/01/2025 15:27, Dmitry Baryshkov wrote: >>> On Mon, Jan 27, 2025 at 08:02:12AM +0100, Krzysztof Kozlowski wrote: >>>> On 24/01/2025 11:53, Viken Dadhaniya wrote: >>>>> Data transfer mode is fixed by TrustZone (TZ), which currently restricts >>>>> developers from modifying the transfer mode from the APPS side. >>>>> >>>>> Document the 'qcom,xfer-mode' properties to select the data transfer mode, >>>>> either GPI DMA (Generic Packet Interface) or non-GPI mode (PIO/CPU DMA). >>>>> >>>>> UART controller can operate in one of two modes based on the >>>>> 'qcom,xfer-mode' property, and the firmware is loaded accordingly. >>>>> >>>>> Co-developed-by: Mukesh Kumar Savaliya >>>>> Signed-off-by: Mukesh Kumar Savaliya >>>>> Signed-off-by: Viken Dadhaniya >>>>> --- >>>>> >>>>> v1 -> v2: >>>>> >>>>> - Drop 'qcom,load-firmware' property and add 'firmware-name' property in >>>>> qup common driver. >>>>> - Update commit log. >>>>> >>>>> v1 Link: https://lore.kernel.org/linux-kernel/20241204150326.1470749-4-quic_vdadhani@quicinc.com/ >>>>> --- >>>>> --- >>>>> .../devicetree/bindings/serial/qcom,serial-geni-qcom.yaml | 8 ++++++++ >>>>> 1 file changed, 8 insertions(+) >>>>> >>>>> diff --git a/Documentation/devicetree/bindings/serial/qcom,serial-geni-qcom.yaml b/Documentation/devicetree/bindings/serial/qcom,serial-geni-qcom.yaml >>>>> index dd33794b3534..383773b32e47 100644 >>>>> --- a/Documentation/devicetree/bindings/serial/qcom,serial-geni-qcom.yaml >>>>> +++ b/Documentation/devicetree/bindings/serial/qcom,serial-geni-qcom.yaml >>>>> @@ -56,6 +56,13 @@ properties: >>>>> reg: >>>>> maxItems: 1 >>>>> >>>>> + qcom,xfer-mode: >>>>> + description: Set the value to 1 for non-GPI (FIFO/CPU DMA) mode and 3 for GPI DMA mode. >>>>> + The default mode is FIFO. >>>>> + $ref: /schemas/types.yaml#/definitions/uint32 >>>>> + enum: [1, 3] >>>>> + >>>>> + >>>> >>>> Just one blank line, but anyway, this property should not be in three >>>> places. Do you really expect that each of serial engines within one >>>> GeniQUP will be configured differently by TZ? >>> >>> Yes, each SE is configured separately and it's quite frequent when >>> different SEs have different DMA configuration. >> >> Well, I checked at sm8550 and sm8650 and each pair of SE - which shares >> resources - has the same DMAs, so I would not call it frequent. Care to >> bring an example where same serial engines have different DMAs and >> different TZ? We do not talk about single QUP. > > Well, I don't have access to the latest sm8550 / sm8650 devcfg sources. > I checked the RB5 ones. As far as I understand out of 14 enabled SEs > only two are configured for the GSI DMA, others should use FIFO / SE > DMA. Same applies to the SM8250 MTP devices. Checking the RB1 / RB2 > setup also shows 3 out of 6 SEs being set for GSI. But they are the same serial engines. Again, we do not talk here about QUP, but serial engines. Best regards, Krzysztof