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From: Stephan Gerhold <stephan@gerhold.net>
To: "David S. Miller" <davem@davemloft.net>,
	Jakub Kicinski <kuba@kernel.org>
Cc: Loic Poulain <loic.poulain@linaro.org>,
	Sergey Ryazanov <ryazanov.s.a@gmail.com>,
	Johannes Berg <johannes@sipsolutions.net>,
	Bjorn Andersson <bjorn.andersson@linaro.org>,
	Andy Gross <agross@kernel.org>, Vinod Koul <vkoul@kernel.org>,
	Rob Herring <robh+dt@kernel.org>,
	Aleksander Morgado <aleksander@aleksander.es>,
	netdev@vger.kernel.org, linux-arm-msm@vger.kernel.org,
	dmaengine@vger.kernel.org, devicetree@vger.kernel.org,
	linux-kernel@vger.kernel.org, phone-devel@vger.kernel.org,
	~postmarketos/upstreaming@lists.sr.ht,
	Jeffrey Hugo <jeffrey.l.hugo@gmail.com>,
	Stephan Gerhold <stephan@gerhold.net>
Subject: [RFC PATCH net-next 1/4] dt-bindings: dmaengine: bam_dma: Add remote power collapse mode
Date: Mon, 19 Jul 2021 16:53:14 +0200	[thread overview]
Message-ID: <20210719145317.79692-2-stephan@gerhold.net> (raw)
In-Reply-To: <20210719145317.79692-1-stephan@gerhold.net>

In some configurations, the BAM DMA controller is set up by a remote
processor and the local processor can simply start making use of it
without setting up the BAM. This is already supported using the
"qcom,controlled-remotely" property.

However, for some reason another possible configuration is that the
remote processor is responsible for powering up the BAM, but we are
still responsible for initializing it (e.g. resetting it etc). Add
a "qcom,remote-power-collapse" property to describe that configuration.

Signed-off-by: Stephan Gerhold <stephan@gerhold.net>
---
NOTE: This is *not* a compile-time requirement for the BAM-DMUX driver
      so this could also go through the dmaengine tree.

Also note that there is an ongoing effort to convert these bindings
to DT schema but sadly there were not any updates for a while. :/
https://lore.kernel.org/linux-arm-msm/20210519143700.27392-2-bhupesh.sharma@linaro.org/
---
 Documentation/devicetree/bindings/dma/qcom_bam_dma.txt | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Documentation/devicetree/bindings/dma/qcom_bam_dma.txt b/Documentation/devicetree/bindings/dma/qcom_bam_dma.txt
index cf5b9e44432c..362a4f0905a8 100644
--- a/Documentation/devicetree/bindings/dma/qcom_bam_dma.txt
+++ b/Documentation/devicetree/bindings/dma/qcom_bam_dma.txt
@@ -15,6 +15,8 @@ Required properties:
   the secure world.
 - qcom,controlled-remotely : optional, indicates that the bam is controlled by
   remote proccessor i.e. execution environment.
+- qcom,remote-power-collapse : optional, indicates that the bam is powered up by
+  a remote processor but must be initialized by the local processor.
 - num-channels : optional, indicates supported number of DMA channels in a
   remotely controlled bam.
 - qcom,num-ees : optional, indicates supported number of Execution Environments
-- 
2.32.0


  reply	other threads:[~2021-07-19 15:06 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-19 14:53 [RFC PATCH net-next 0/4] net: wwan: Add Qualcomm BAM-DMUX WWAN network driver Stephan Gerhold
2021-07-19 14:53 ` Stephan Gerhold [this message]
2021-07-29 19:36   ` [RFC PATCH net-next 1/4] dt-bindings: dmaengine: bam_dma: Add remote power collapse mode Rob Herring
2021-07-29 19:50     ` Stephan Gerhold
2021-07-19 14:53 ` [RFC PATCH net-next 2/4] dmaengine: qcom: " Stephan Gerhold
2021-07-19 14:53 ` [RFC PATCH net-next 3/4] dt-bindings: net: Add schema for Qualcomm BAM-DMUX Stephan Gerhold
2021-07-19 14:53 ` [RFC PATCH net-next 4/4] net: wwan: Add Qualcomm BAM-DMUX WWAN network driver Stephan Gerhold
2021-07-19 16:01   ` Loic Poulain
2021-07-22 15:40     ` Stephan Gerhold
2021-07-24 11:25       ` Sergey Ryazanov
2021-07-26  8:10         ` Aleksander Morgado
2021-07-26 22:40           ` Sergey Ryazanov
2021-07-20  9:10   ` Sergey Ryazanov
2021-07-21 12:17     ` Stephan Gerhold
2021-07-24 10:22       ` Sergey Ryazanov
2021-07-19 15:43 ` [RFC PATCH net-next 0/4] " Jeffrey Hugo
2021-07-19 18:23   ` Stephan Gerhold
2021-07-19 23:13     ` Jeffrey Hugo
2021-07-22 14:51       ` Stephan Gerhold
2021-07-26 14:58         ` Jeffrey Hugo

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