On Friday 11 September 2015 15:14:26 Peter Griffin wrote:
> +
> +#include "st_fdma.h"
Just move the contents of that file here, no other driver should
be including it.
> +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.
> + 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.
> +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?
Arnd
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