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Date: Fri, 29 May 2020 01:23:58 +0300 From: Serge Semin <Sergey.Semin@...kalelectronics.ru> To: Vinod Koul <vkoul@...nel.org>, Viresh Kumar <vireshk@...nel.org>, Andy Shevchenko <andriy.shevchenko@...ux.intel.com>, Dan Williams <dan.j.williams@...el.com> CC: Serge Semin <Sergey.Semin@...kalelectronics.ru>, Serge Semin <fancer.lancer@...il.com>, Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>, Thomas Bogendoerfer <tsbogend@...ha.franken.de>, Arnd Bergmann <arnd@...db.de>, Rob Herring <robh+dt@...nel.org>, <linux-mips@...r.kernel.org>, <devicetree@...r.kernel.org>, <dmaengine@...r.kernel.org>, <linux-kernel@...r.kernel.org> Subject: [PATCH v4 08/11] dmaengine: dw: Add dummy device_caps callback Since some DW DMA controllers (like one installed on Baikal-T1 SoC) may have non-uniform DMA capabilities per device channels, let's add the DW DMA specific device_caps callback to expose that specifics up to the DMA consumer. It's a dummy function for now. We'll fill it in with capabilities overrides in the next commits. Signed-off-by: Serge Semin <Sergey.Semin@...kalelectronics.ru> Cc: Alexey Malahov <Alexey.Malahov@...kalelectronics.ru> Cc: Thomas Bogendoerfer <tsbogend@...ha.franken.de> Cc: Arnd Bergmann <arnd@...db.de> Cc: Rob Herring <robh+dt@...nel.org> Cc: linux-mips@...r.kernel.org Cc: devicetree@...r.kernel.org --- Changelog v3: - This is a new patch created as a result of the discussion with Vinud and Andy in the framework of DW DMA burst and LLP capabilities. --- drivers/dma/dw/core.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/dma/dw/core.c b/drivers/dma/dw/core.c index fb95920c429e..ceded21537e2 100644 --- a/drivers/dma/dw/core.c +++ b/drivers/dma/dw/core.c @@ -1049,6 +1049,11 @@ static void dwc_free_chan_resources(struct dma_chan *chan) dev_vdbg(chan2dev(chan), "%s: done\n", __func__); } +static void dwc_caps(struct dma_chan *chan, struct dma_slave_caps *caps) +{ + +} + int do_dma_probe(struct dw_dma_chip *chip) { struct dw_dma *dw = chip->dw; @@ -1214,6 +1219,7 @@ int do_dma_probe(struct dw_dma_chip *chip) dw->dma.device_prep_dma_memcpy = dwc_prep_dma_memcpy; dw->dma.device_prep_slave_sg = dwc_prep_slave_sg; + dw->dma.device_caps = dwc_caps; dw->dma.device_config = dwc_config; dw->dma.device_pause = dwc_pause; dw->dma.device_resume = dwc_resume; -- 2.26.2
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