From: Vinod Koul <vinod.koul@intel.com>
To: Pierre Yves MORDRET <pierre-yves.mordret@st.com>
Cc: Rob Herring <robh+dt@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
Maxime Coquelin <mcoquelin.stm32@gmail.com>,
Alexandre TORGUE <alexandre.torgue@st.com>,
Russell King <linux@armlinux.org.uk>,
Dan Williams <dan.j.williams@intel.com>,
"M'boumba Cedric Madianga" <cedric.madianga@gmail.com>,
Fabrice GASNIER <fabrice.gasnier@st.com>,
Herbert Xu <herbert@gondor.apana.org.au>,
Fabien DESSENNE <fabien.dessenne@st.com>,
Amelie DELAUNAY <amelie.delaunay@st.com>,
"dmaengine@vger.kernel.org" <dmaengine@vger.kernel.org>,
"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v3 2/5] dmaengine: Add STM32 DMAMUX driver
Date: Wed, 26 Jul 2017 10:59:31 +0530 [thread overview]
Message-ID: <20170726052930.GF3053@localhost> (raw)
In-Reply-To: <2b916330-9b65-f4d5-817f-79b66cc236b3@st.com>
On Mon, Jul 24, 2017 at 01:55:10PM +0000, Pierre Yves MORDRET wrote:
> >> +
> >> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> >> + if (!res)
> >> + return -ENODEV;
> >> +
> >> + iomem = devm_ioremap_resource(&pdev->dev, res);
> >> + if (!iomem)
> >> + return -ENOMEM;
> >> +
> >> + spin_lock_init(&stm32_dmamux->lock);
> >> +
> >> + stm32_dmamux->clk = devm_clk_get(&pdev->dev, NULL);
> >> + if (IS_ERR(stm32_dmamux->clk)) {
> >> + dev_info(&pdev->dev, "Missing controller clock\n");
> >
> > Can you check for EPROBE_DEFER and print only for if that is not the error
> > otherwise we end up sapmming with defered probe issues
> >
>
> This is what you meant ?
> if (IS_ERR(stm32_dmamux->clk) != EPROBE_DEFER) {
> dev_info(&pdev->dev, "Missing controller clock\n");
> return PTR_ERR(stm32_dmamux->clk);
> }
>
> OR
>
> if (IS_ERR(stm32_dmamux->clk)) {
> if (IS_ERR(stm32_dmamux->clk) != EPROBE_DEFER)
> dev_info(&pdev->dev, "Missing controller clock\n");
> return PTR_ERR(stm32_dmamux->clk);
> }
This one please
>
> >> +
> >> +#ifndef __DMA_STM32_DMAMUX_H
> >> +#define __DMA_STM32_DMAMUX_H
> >> +
> >> +#if defined(CONFIG_STM32_DMAMUX)
> >> +int stm32_dmamux_set_config(struct device *dev, void *route_data, u32 chan_id);
> >
> > Why do we need a custom API in this case?
> >
>
> This API is called by DMA when a slave is requested by client. DMA can work
> without DMAMUX this API has been put in place to configure DMAMUX whether client
> is requesting a DMAMUX Channel instead of a DMA one.
You mean the dmaengine driver right?
--
~Vinod
next prev parent reply other threads:[~2017-07-26 5:26 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-07-06 12:20 [PATCH v3 0/5] Add STM32 DMAMUX support Pierre-Yves MORDRET
2017-07-06 12:20 ` [PATCH v3 1/5] dt-bindings: Document the STM32 DMAMUX bindings Pierre-Yves MORDRET
2017-07-10 3:56 ` Rob Herring
2017-07-06 12:20 ` [PATCH v3 2/5] dmaengine: Add STM32 DMAMUX driver Pierre-Yves MORDRET
2017-07-22 6:51 ` Vinod Koul
2017-07-24 13:55 ` Pierre Yves MORDRET
2017-07-26 5:29 ` Vinod Koul [this message]
2017-07-26 7:38 ` Pierre Yves MORDRET
2017-07-31 12:31 ` Vinod Koul
2017-08-01 9:32 ` Pierre Yves MORDRET
2017-08-02 4:55 ` Vinod Koul
2017-08-02 9:19 ` Peter Ujfalusi
2017-08-02 13:11 ` Pierre Yves MORDRET
2017-08-02 14:09 ` Peter Ujfalusi
2017-08-02 14:28 ` Pierre Yves MORDRET
2017-08-03 6:42 ` Peter Ujfalusi
2017-08-03 9:00 ` Pierre Yves MORDRET
2017-08-03 9:48 ` Peter Ujfalusi
2017-08-04 12:50 ` Pierre Yves MORDRET
2017-08-04 14:21 ` Peter Ujfalusi
2017-08-21 9:34 ` Pierre Yves MORDRET
2017-08-24 5:47 ` Peter Ujfalusi
2017-08-24 13:03 ` Pierre Yves MORDRET
2017-08-28 11:48 ` Peter Ujfalusi
2017-08-30 8:02 ` Pierre Yves MORDRET
2017-07-06 12:20 ` [PATCH v3 3/5] dt-bindings: stm32-dma: Add property to handle STM32 DMAMUX Pierre-Yves MORDRET
2017-07-10 3:57 ` Rob Herring
2017-07-06 12:20 ` [PATCH v3 4/5] dmaengine: stm32-dma: Add support for " Pierre-Yves MORDRET
2017-07-06 12:20 ` [PATCH v3 5/5] ARM: configs: stm32: Add DMAMUX support in STM32 defconfig Pierre-Yves MORDRET
2017-07-20 9:42 ` [PATCH v3 0/5] Add STM32 DMAMUX support Pierre Yves MORDRET
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