Hi Arnd,

Thanks for reviewing.

On Fri, 11 Sep 2015, Arnd Bergmann wrote:

On Friday 11 September 2015 15:14:26 Peter Griffin wrote:

quoted

+
+#include "st_fdma.h"

Just move the contents of that file here, no other driver should
be including it.

There is another file st_fdma_xbar.c which will be upstreamed shortly
which uses some parts of this header. It was originally part of the
v1 series here: -
http://lists.infradead.org/pipermail/linux-arm-kernel/2015-July/355069.html

But I removed it from subsequent submissions as it needs to be re-worked
to use some of the new xbar functionality recently added by TI.

However large parts probably aren't required by xbar, and could be
moved into the c file, so I will move those parts in the next submission.

quoted

+static struct dma_chan *st_fdma_of_xlate(struct of_phandle_args *dma_spec,
+					 struct of_dma *ofdma)
+{
+	struct st_fdma_dev *fdev = ofdma->of_dma_data;
+	struct st_fdma_cfg cfg;
+
+	if (dma_spec->args_count < 1)
+		return NULL;
+
+	cfg.of_node = dma_spec->np;
+	cfg.req_line = dma_spec->args[0];
+	cfg.req_ctrl = 0;
+	cfg.type = ST_FDMA_TYPE_FREE_RUN;
+
+	if (dma_spec->args_count > 1)
+		cfg.req_ctrl = dma_spec->args[1] & REQ_CTRL_CFG_MASK;
+
+	if (dma_spec->args_count > 2)
+		cfg.type = dma_spec->args[2];

The binding mandates #dma-cells=<3>, so you can just return an error
otherwise.

Ok will fix in next submission

quoted

+	dev_dbg(fdev->dev, "xlate req_line:%d type:%d req_ctrl:%#x\n",
+		cfg.req_line, cfg.type, cfg.req_ctrl);
+
+	return dma_request_channel(fdev->dma_device.cap_mask,
+			st_fdma_filter_fn, &cfg);
+}

Why this indirection? You should be able to just use
dma_get_any_slave_channel() to get the first available channel and
then configure it the same way that the filter function does.

Ok I will look at using this API instead of dma_request_channel
in the next submission.

quoted

+bool st_fdma_filter_fn(struct dma_chan *chan, void *param)
+{
+	struct st_fdma_cfg *config = param;
+	struct st_fdma_chan *fchan = to_st_fdma_chan(chan);
+
+	if (!param)
+		return false;
+
+	if (fchan->fdev->dma_device.dev->of_node != config->of_node)
+		return false;
+
+	fchan->cfg = *config;
+
+	return true;
+}

Please drop this until there is a board file that references the
function. Otherwise it's just dead code. I assume there are some
users in arch/sh/ in a private tree?

I'll drop this in the next submission. There aren't any users I can
see in the private tree. This function is currently only used by
dma_reuest_channel above, so won't be required if we move over to
using dma_get_any_slave_channel().

regards,

Peter.