From: Peter Griffin <peter.griffin@linaro.org>
To: Lee Jones <lee.jones@linaro.org>
Cc: 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,
devicetree@vger.kernel.org, dmaengine@vger.kernel.org,
ludovic.barre@st.com
Subject: Re: [PATCH 5/7] ARM: STi: DT: STiH407: Add FDMA driver and xbar driver dt nodes.
Date: Thu, 3 Sep 2015 15:12:11 +0100 [thread overview]
Message-ID: <20150903141211.GA5120@griffinp-ThinkPad-X1-Carbon-2nd> (raw)
In-Reply-To: <20150826074620.GV19409@x1>
Hi Lee,
On Wed, 26 Aug 2015, Lee Jones wrote:
> On Wed, 08 Jul 2015, Peter Griffin wrote:
>
> > These nodes are required to get the fdma and xbar driver working
> > on STiH407 based silicon.
> >
> > Signed-off-by: Peter Griffin <peter.griffin@linaro.org>
> > ---
> > arch/arm/boot/dts/stih407-family.dtsi | 59 +++++++++++++++++++++++++++++++++++
> > 1 file changed, 59 insertions(+)
> >
> > diff --git a/arch/arm/boot/dts/stih407-family.dtsi b/arch/arm/boot/dts/stih407-family.dtsi
> > index 838b812..b6d9e20 100644
> > --- a/arch/arm/boot/dts/stih407-family.dtsi
> > +++ b/arch/arm/boot/dts/stih407-family.dtsi
> > @@ -565,5 +565,64 @@
> > <&phy_port2 PHY_TYPE_USB3>;
> > };
> > };
> > +
> > + xbar0: fdma-xbar-mpe@0 {
>
> The unit address should match the one in the reg property.
Will fix in v2.
>
> > + compatible = "st,fdma-xbar-1.0";
>
> Is that a version number in the compatible string?
Yes it is the version number of the IP.
>
> > + reg = <0x8e80000 0x1000>;
> > + dma-requests = <79>;
> > + #st,fdma-xbar-cells = <1>;
>
> Why can't FDMA use the generic DMA properties?
Well the FDMA controller does, but this is a seperate piece of hw
which is really a router rather than a controller.
However I plan on temporarily removing xbar from this series,
as I think it should be re-worked to use the of_dma_router_register
and friends provided by the TI xbar driver.
It looks like the two xbar hw are serving a very similar purpose,
so once that re-work is done it can also use generic DMA propoerties
as I believe using that framework it will get registered as a controller.
>
> > + };
> > +
> > + fdma0: fdma-audio@0 {
>
> Same comment as above.
Will fix in v2.
>
> > + compatible = "st,fdma_mpe31";
>
> DT doesn't usually like underscores.
Obviously I can trivially change it, but out of interest is there
a technical reason for doing so? Clearly it works OK with
an underscore and a quick grep reveals a lot of ste, and some tegra
and vexpress compatibles using underscore as well.
>
> > + reg = <0x8e20000 0x20000>;
> > + interrupts = <GIC_SPI 5 IRQ_TYPE_NONE>;
> > + dma-channels = <16>;
> > + #dma-cells = <3>;
> > + st,fw-name = "fdma_STiH407_0.elf";
>
> I've bought this up before somewhere (although there doesn't appear to
> be a Firmware Maintainer), surely we should define a generic binding
> for passing firmware names? Many vendors are going to require it.
A generic binding would certainly be useful.
>From what I can see TI are using: -
ti,pm-firmware in wkup_m3_rproc.c
and Freescale are using: -
fsl,sdma-ram-script-name in imx-sdma.c
So other platforms are putting it in device tree, there are probably other
examples.
Most other STi drivers keep the firmware name in the C code, which is
usually my first preference. However with fdma it is more comlicated
as there is a seperate firmware file for each instance of the IP block.
I will see if there is a way to remove this from DT and keep it in
the driver.
>
> > + clocks = <&clk_s_c0_flexgen CLK_FDMA>,
> > + <&clk_s_c0_flexgen CLK_EXT2F_A9>,
> > + <&clk_s_c0_flexgen CLK_EXT2F_A9>,
> > + <&clk_s_c0_flexgen CLK_EXT2F_A9>;
> > + clock-names = "fdma_slim",
> > + "fdma_hi",
> > + "fdma_low",
> > + "fdma_ic";
> > + };
> > +
> > + fdma1: fdma-app@1 {
>
> As above.
Will fix
>
> > + compatible = "st,fdma_mpe31";
>
> As above.
Will fix
>
> > + reg = <0x8e40000 0x20000>;
> > + interrupts = <GIC_SPI 7 IRQ_TYPE_NONE>;
> > + dma-channels = <16>;
> > + #dma-cells = <3>;
> > + st,fdma-xbar = <&xbar0 0>;
> > + 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";
> > + };
> > +
> > + fdma2: fdma-free_running@2 {
> > + compatible = "st,fdma_mpe31";
> > + reg = <0x8e60000 0x20000>;
> > + interrupts = <GIC_SPI 9 IRQ_TYPE_NONE>;
> > + dma-channels = <16>;
> > + #dma-cells = <3>;
> > + st,fw-name = "fdma_STiH407_2.elf";
> > + clocks = <&clk_s_c0_flexgen CLK_FDMA>,
> > + <&clk_s_c0_flexgen CLK_EXT2F_A9>,
> > + <&clk_s_c0_flexgen CLK_TX_ICN_DISP_0>,
> > + <&clk_s_c0_flexgen CLK_EXT2F_A9>;
> > + clock-names = "fdma_slim",
> > + "fdma_hi",
> > + "fdma_low",
> > + "fdma_ic";
> > + };
> > };
> > };
>
> --
> Lee Jones
> Linaro STMicroelectronics Landing Team Lead
> Linaro.org │ Open source software for ARM SoCs
> Follow Linaro: Facebook | Twitter | Blog
regards,
Peter.
next prev parent reply other threads:[~2015-09-03 14:12 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 ` [PATCH 1/7] dmaengine: st_fdma: Add STMicroelectronics FDMA DT binding documentation Peter Griffin
2015-08-19 15:06 ` 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 [this message]
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=20150903141211.GA5120@griffinp-ThinkPad-X1-Carbon-2nd \
--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).