From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andy Shevchenko Subject: Re: [PATCH v5 2/2] DW DMAC: add multi-block property to device tree Date: Thu, 24 Nov 2016 17:52:08 +0200 Message-ID: <1480002728.20074.15.camel@linux.intel.com> References: <1479999878-19120-1-git-send-email-Eugeniy.Paltsev@synopsys.com> <1479999878-19120-3-git-send-email-Eugeniy.Paltsev@synopsys.com> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8bit Return-path: In-Reply-To: <1479999878-19120-3-git-send-email-Eugeniy.Paltsev-HKixBCOQz3hWk0Htik3J/w@public.gmane.org> Sender: devicetree-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Eugeniy Paltsev , devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org Cc: robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org, mark.rutland-5wv7dgnIgG8@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, vinod.koul-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org, dmaengine-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, arnd-r2nGTMty4D4@public.gmane.org, linux-snps-arc-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, vireshk-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org, shiraz.linux.kernel-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org, christian.ruppert-Yycd8EPnGM5BDgjK7y7TUQ@public.gmane.org List-Id: devicetree@vger.kernel.org On Thu, 2016-11-24 at 18:04 +0300, Eugeniy Paltsev wrote: > Several versions of DW DMAC have multi block transfers hardware > support. Hardware support of multi block transfers is disabled > by default if we use DT to configure DMAC and software emulation > of multi block transfers used instead. > Add multi-block property, so it is possible to enable hardware > multi block transfers (if present) via DT. > > Switch from per device is_nollp variable to multi_block array > to be able enable/disable multi block transfers separately per > channel. Thanks for an update. Basically I'm fine with this one. So, we still have question about autoconfiguration in SPEAr SoCs, and your ARC SoC but it's a different story. I would expect once you will clarify it. Another one is minor listed below, otherwise Acked-by: Andy Shevchenko > Signed-off-by: Eugeniy Paltsev > --- a/drivers/dma/dw/platform.c > +++ b/drivers/dma/dw/platform.c > @@ -102,7 +102,7 @@ dw_dma_parse_dt(struct platform_device *pdev) >  { >   struct device_node *np = pdev->dev.of_node; >   struct dw_dma_platform_data *pdata; > - u32 tmp, arr[DW_DMA_MAX_NR_MASTERS]; > + u32 tmp, arr[DW_DMA_MAX_NR_MASTERS], > chan[DW_DMA_MAX_NR_CHANNELS]; chan here will confuse people... > @@ -152,6 +154,11 @@ dw_dma_parse_dt(struct platform_device *pdev) >   pdata->data_width[tmp] = BIT(arr[tmp] & > 0x07); >   } >   > + if (!of_property_read_u32_array(np, "multi-block", chan, > nr_channels)) { > + for (tmp = 0; tmp < nr_channels; tmp++) > + pdata->multi_block[tmp] = chan[tmp]; ...mb (as short of multi-block) would suit better. -- Andy Shevchenko Intel Finland Oy -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html