From patchwork Mon Dec 20 19:08:39 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Paul Cercueil X-Patchwork-Id: 527330 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 49E2BC433EF for ; Mon, 20 Dec 2021 19:09:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240515AbhLTTJB (ORCPT ); Mon, 20 Dec 2021 14:09:01 -0500 Received: from aposti.net ([89.234.176.197]:34358 "EHLO aposti.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240701AbhLTTI7 (ORCPT ); Mon, 20 Dec 2021 14:08:59 -0500 From: Paul Cercueil To: Ulf Hansson , Rob Herring Cc: list@opendingux.net, linux-mmc@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mips@vger.kernel.org, Paul Cercueil Subject: [PATCH 1/2] dt-bindings: mmc: ingenic: Support using bi-directional DMA channel Date: Mon, 20 Dec 2021 19:08:39 +0000 Message-Id: <20211220190840.108061-2-paul@crapouillou.net> In-Reply-To: <20211220190840.108061-1-paul@crapouillou.net> References: <20211220190840.108061-1-paul@crapouillou.net> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-mmc@vger.kernel.org Update the binding documentation and the examples to support bi-directional DMA channels. Signed-off-by: Paul Cercueil --- .../devicetree/bindings/mmc/ingenic,mmc.yaml | 37 ++++++++++++++++--- 1 file changed, 31 insertions(+), 6 deletions(-) diff --git a/Documentation/devicetree/bindings/mmc/ingenic,mmc.yaml b/Documentation/devicetree/bindings/mmc/ingenic,mmc.yaml index 01d5c6da0eeb..2d10aedf2e00 100644 --- a/Documentation/devicetree/bindings/mmc/ingenic,mmc.yaml +++ b/Documentation/devicetree/bindings/mmc/ingenic,mmc.yaml @@ -39,14 +39,15 @@ properties: const: mmc dmas: - items: - - description: DMA controller phandle and request line for RX - - description: DMA controller phandle and request line for TX + minItems: 1 + maxItems: 2 dma-names: - items: - - const: rx - - const: tx + oneOf: + - items: + - const: rx + - const: tx + - const: tx-rx required: - compatible @@ -80,3 +81,27 @@ examples: <&dma JZ4780_DMA_MSC0_TX 0xffffffff>; dma-names = "rx", "tx"; }; + - | + #include + #include + /* + * Alternative version of the example above, + * but using one single DMA channel for both + * TX and RX. + */ + mmc1: mmc@13460000 { + compatible = "ingenic,jz4780-mmc"; + reg = <0x13460000 0x1000>; + + interrupt-parent = <&intc>; + interrupts = <36>; + + clocks = <&cgu JZ4780_CLK_MSC1>; + clock-names = "mmc"; + + cap-sd-highspeed; + cap-mmc-highspeed; + cap-sdio-irq; + dmas = <&dma JZ4780_DMA_MSC1_TX JZ4780_DMA_MSC1_RX 0xffffffff>; + dma-names = "tx-rx"; + };