linux-kernel - [PATCH v3 0/3] Tegra GPCDMA: Add channel-mask support

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Message-ID: <20221101082712.59263-1-akhilrajeev@nvidia.com>
Date:   Tue, 1 Nov 2022 13:57:09 +0530
From:   Akhil R <akhilrajeev@...dia.com>
To:     <ldewangan@...dia.com>, <jonathanh@...dia.com>, <vkoul@...nel.org>,
        <thierry.reding@...il.com>, <p.zabel@...gutronix.de>,
        <dmaengine@...r.kernel.org>, <linux-tegra@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <robh+dt@...nel.org>,
        <devicetree@...r.kernel.org>, <krzysztof.kozlowski+dt@...aro.org>,
        <sfr@...b.auug.org.au>
CC:     <akhilrajeev@...dia.com>
Subject: [PATCH v3 0/3] Tegra GPCDMA: Add channel-mask support

Read dma-channel-mask from device tree and register only the
specified channels. This is useful to reserve some channels for the
firmware.

Also update the channel number and interrupts to include all 32
channels. The current driver was using only 31 channels as one
channel was reserved for firmware. Now with this change, the driver
can align more to the actual hardware.

v2->v3:
  * Updates in driver and DT to provide only the interrupts
    corresponding to the channels used in kernel. This would fix
    the ABI breakage that could occur with the previous version

v1->v2:
  * Reversed the operands and used BIT macro in 'if' condition.
  * Fixed warning reported-by: kernel test robot <lkp@...el.com>

Akhil R (3):
  dt-bindings: dmaengine: Add dma-channel-mask to Tegra GPCDMA
  arm64: tegra: Add dma-channel-mask in GPCDMA node
  dmaengine: tegra: Add support for dma-channel-mask

 .../bindings/dma/nvidia,tegra186-gpc-dma.yaml |  7 ++-
 arch/arm64/boot/dts/nvidia/tegra186.dtsi      |  1 +
 arch/arm64/boot/dts/nvidia/tegra194.dtsi      |  1 +
 arch/arm64/boot/dts/nvidia/tegra234.dtsi      |  1 +
 drivers/dma/tegra186-gpc-dma.c                | 46 +++++++++++++++----
 5 files changed, 46 insertions(+), 10 deletions(-)

-- 
2.17.1