From: Peter Griffin <peter.griffin@linaro.org>
To: linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, srinivas.kandagatla@gmail.com,
maxime.coquelin@st.com, patrice.chotard@st.com,
vinod.koul@intel.com, dan.j.williams@intel.com
Cc: peter.griffin@linaro.org, lee.jones@linaro.org,
devicetree@vger.kernel.org, dmaengine@vger.kernel.org,
ludovic.barre@st.com
Subject: [PATCH 1/7] dmaengine: st_fdma: Add STMicroelectronics FDMA DT binding documentation
Date: Wed, 8 Jul 2015 17:11:22 +0100 [thread overview]
Message-ID: <1436371888-27863-2-git-send-email-peter.griffin@linaro.org> (raw)
In-Reply-To: <1436371888-27863-1-git-send-email-peter.griffin@linaro.org>
This patch adds the DT binding documentation for the FDMA constroller
found on STi based chipsets from STMicroelectronics.
Signed-off-by: Ludovic Barre <ludovic.barre@st.com>
Signed-off-by: Peter Griffin <peter.griffin@linaro.org>
---
Documentation/devicetree/bindings/dma/st_fdma.txt | 76 +++++++++++++++++++++++
1 file changed, 76 insertions(+)
create mode 100644 Documentation/devicetree/bindings/dma/st_fdma.txt
diff --git a/Documentation/devicetree/bindings/dma/st_fdma.txt b/Documentation/devicetree/bindings/dma/st_fdma.txt
new file mode 100644
index 0000000..1ec7470
--- /dev/null
+++ b/Documentation/devicetree/bindings/dma/st_fdma.txt
@@ -0,0 +1,76 @@
+* STMicroelectronics Flexible Direct Memory Access Device Tree bindings
+
+The FDMA is a general-purpose direct memory access controller capable of
+supporting 16 independent DMA channels. It accepts up to 32 DMA requests.
+The FDMA is based on a Slim processor which require a firmware.
+
+* FDMA Controller
+
+Required properties:
+- compatible : Should be "st,fdma_mpe31"
+- reg : Should contain DMA registers location and length
+- interrupts : Should contain one interrupt shared by all channel
+- dma-channels : Number of channels supported by the controller
+- #dma-cells : Must be <3>.
+- st,fw-name : Should contain the name of the firmware to be loaded
+- clocks : Must contain an entry for each name in clock-names
+- clock-names : Must contain "fdma_slim, fdma_hi, fdma_low, fdma_ic" entries
+See: Documentation/devicetree/bindings/clock/clock-bindings.txt
+
+
+Example:
+
+ fdma1: fdma-app@1 {
+ compatible = "st,fdma_mpe31";
+ reg = <0x8e40000 0x20000>;
+ interrupts = <GIC_SPI 7 IRQ_TYPE_NONE>;
+ dma-channels = <16>;
+ #dma-cells = <3>;
+ st,fw-name = "fdma_STiH407_1.elf";
+ clocks = <&CLK_S_C0_FLEXGEN CLK_FDMA>,
+ <&CLK_S_C0_FLEXGEN CLK_TX_ICN_DMU>,
+ <&CLK_S_C0_FLEXGEN CLK_TX_ICN_DMU>,
+ <&CLK_S_C0_FLEXGEN CLK_EXT2F_A9>;
+ clock-names = "fdma_slim",
+ "fdma_hi",
+ "fdma_low",
+ "fdma_ic";
+
+* DMA client
+
+Required properties:
+- dmas: Comma separated list of dma channel requests
+- dma-names: Names of the aforementioned requested channels
+
+Each dmas request consists of 4 cells:
+1. A phandle pointing to the FDMA controller
+2. The request line number
+3. A 32bit mask specifying (see include/linux/platform_data/dma-st-fdma.h)
+ -bit 2-0: Holdoff value, dreq will be masked for
+ 0x0: 0-0.5us
+ 0x1: 0.5-1us
+ 0x2: 1-1.5us
+ -bit 17: data swap
+ 0x0: disabled
+ 0x1: enabled
+ -bit 21: Increment Address
+ 0x0: no address increment between transfers
+ 0x1: increment address between transfers
+ -bit 22: 2 STBus Initiator Coprocessor interface
+ 0x0: high priority port
+ 0x1: low priority port
+4. transfers type
+ 0 free running
+ 1 paced
+
+Example:
+
+ snd_uni_player2: snd-uni-player@2 {
+ compatible = "st,snd_uni_player";
+ status = "okay";
+ reg = <0x8D82000 0x158>;
+ interrupts = <GIC_SPI 86 IRQ_TYPE_NONE>;
+ version = <5>;
+ dmas = <&fdma0 4 0 1>;
+ dma-names = "tx";
+ description = "Uni Player #2 (DAC)";
--
1.9.1
next prev parent reply other threads:[~2015-07-08 16:11 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-08 16:11 [PATCH 0/7] Add support for FDMA DMA controller found on STi chipsets Peter Griffin
2015-07-08 16:11 ` Peter Griffin [this message]
2015-08-19 15:06 ` [PATCH 1/7] dmaengine: st_fdma: Add STMicroelectronics FDMA DT binding documentation Vinod Koul
2015-08-25 17:08 ` Peter Griffin
2015-08-26 7:12 ` Lee Jones
2015-09-03 9:18 ` Peter Griffin
2015-07-08 16:11 ` [PATCH 2/7] dmaengine: st_fdma: Add STMicroelectronics FDMA xbar " Peter Griffin
2015-07-08 16:11 ` [PATCH 3/7] dmaengine: st_fdma: Add STMicroelectronics FDMA engine driver support Peter Griffin
2015-07-09 8:17 ` Paul Bolle
2015-08-28 17:59 ` Peter Griffin
2015-08-31 7:49 ` Maxime Coquelin
2015-08-31 8:08 ` Paul Bolle
2015-08-31 8:44 ` Maxime Coquelin
2015-08-19 15:40 ` Vinod Koul
2015-09-02 17:42 ` Peter Griffin
2015-07-08 16:11 ` [PATCH 4/7] dmaengine: st_fdma: Add xbar support Peter Griffin
2015-07-09 8:27 ` Paul Bolle
2015-07-08 16:11 ` [PATCH 5/7] ARM: STi: DT: STiH407: Add FDMA driver and xbar driver dt nodes Peter Griffin
2015-08-26 7:46 ` Lee Jones
2015-09-03 14:12 ` Peter Griffin
2015-07-08 16:11 ` [PATCH 6/7] MAINTAINERS: Add FDMA driver files to STi section Peter Griffin
2015-08-26 7:33 ` Lee Jones
2015-09-02 15:14 ` Peter Griffin
2015-07-08 16:11 ` [PATCH 7/7] ARM: multi_v7_defconfig: Enable STi FDMA driver Peter Griffin
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1436371888-27863-2-git-send-email-peter.griffin@linaro.org \
--to=peter.griffin@linaro.org \
--cc=dan.j.williams@intel.com \
--cc=devicetree@vger.kernel.org \
--cc=dmaengine@vger.kernel.org \
--cc=lee.jones@linaro.org \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-kernel@vger.kernel.org \
--cc=ludovic.barre@st.com \
--cc=maxime.coquelin@st.com \
--cc=patrice.chotard@st.com \
--cc=srinivas.kandagatla@gmail.com \
--cc=vinod.koul@intel.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).