On Wed, Apr 08, 2015 at 11:42:24AM +0100, Yoshihiro Shimoda wrote: > Since the DT should describe the hardware (not the driver limitation), > This patch revises the binding document about the dma-names to change > simple numbering as "ch%d" instead of "tx<n>" and "rx<n>". The naming given in this patch looks more sensible to me. > Also this patch fixes the actual code of renesas_usbhs driver to handle > the new dma-names. > > Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx> > --- > This patch is based on Felipe's usb.bit / testing/next branch. > (commit id = bbc78c07a51f6fd29c227b1220a9016e585358ba) I take it the existing driver and binding haven't hit mainline, and therefore there are no users yet? Mark. > > Geert is pointed out about this issue: > https://www.mail-archive.com/devicetree@xxxxxxxxxxxxxxx/msg68401.html > > .../devicetree/bindings/usb/renesas_usbhs.txt | 6 ++---- > drivers/usb/renesas_usbhs/fifo.c | 24 ++++++++++++++-------- > 2 files changed, 17 insertions(+), 13 deletions(-) > > diff --git a/Documentation/devicetree/bindings/usb/renesas_usbhs.txt b/Documentation/devicetree/bindings/usb/renesas_usbhs.txt > index dc2a18f..ddbe304 100644 > --- a/Documentation/devicetree/bindings/usb/renesas_usbhs.txt > +++ b/Documentation/devicetree/bindings/usb/renesas_usbhs.txt > @@ -15,10 +15,8 @@ Optional properties: > - phys: phandle + phy specifier pair > - phy-names: must be "usb" > - dmas: Must contain a list of references to DMA specifiers. > - - dma-names : Must contain a list of DMA names: > - - tx0 ... tx<n> > - - rx0 ... rx<n> > - - This <n> means DnFIFO in USBHS module. > + - dma-names : named "ch%d", where %d is the channel number ranging from zero > + to the number of channels (DnFIFOs) minus one. > > Example: > usbhs: usb@e6590000 { > diff --git a/drivers/usb/renesas_usbhs/fifo.c b/drivers/usb/renesas_usbhs/fifo.c > index 8597cf9..bc23b4a 100644 > --- a/drivers/usb/renesas_usbhs/fifo.c > +++ b/drivers/usb/renesas_usbhs/fifo.c > @@ -1227,15 +1227,21 @@ static void usbhsf_dma_init_dt(struct device *dev, struct usbhs_fifo *fifo, > { > char name[16]; > > - snprintf(name, sizeof(name), "tx%d", channel); > - fifo->tx_chan = dma_request_slave_channel_reason(dev, name); > - if (IS_ERR(fifo->tx_chan)) > - fifo->tx_chan = NULL; > - > - snprintf(name, sizeof(name), "rx%d", channel); > - fifo->rx_chan = dma_request_slave_channel_reason(dev, name); > - if (IS_ERR(fifo->rx_chan)) > - fifo->rx_chan = NULL; > + /* > + * To avoid complex handing for DnFIFOs, the driver uses each > + * DnFIFO as TX or RX direction (not bi-direction). > + * So, the driver uses odd channels for TX, even channels for RX. > + */ > + snprintf(name, sizeof(name), "ch%d", channel); > + if (channel & 1) { > + fifo->tx_chan = dma_request_slave_channel_reason(dev, name); > + if (IS_ERR(fifo->tx_chan)) > + fifo->tx_chan = NULL; > + } else { > + fifo->rx_chan = dma_request_slave_channel_reason(dev, name); > + if (IS_ERR(fifo->rx_chan)) > + fifo->rx_chan = NULL; > + } > } > > static void usbhsf_dma_init(struct usbhs_priv *priv, struct usbhs_fifo *fifo, > -- > 1.9.1 > -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
