On Thu, Aug 27, 2015 at 09:19:18PM +0530, Anurag Kumar Vulisha wrote:
> This VDMA is a soft ip, which can be programmed to support
> 32 bit addressing or greater than 32 bit addressing.
>
> When the VDMA ip is configured for 32 bit address space the
> transfer start address is specified by a single register.
would be good to specfiy which one
> When the VDMA core is configured for an address space greater
> than 32 then each start address is specified by a combination
> of two registers. The first register specifies the LSB 32 bits
> of address, while the next register specifies the MSB 32 bits
> of address.For example,5Ch will specify the LSB 32 bits while
> 60h will specify the MSB 32 bits of the first start address.So
> we need to program two registers at a time.
can we have spaces after full stops and commas!
> +/* Since vdma driver is trying to write to a register offset which is not a
> + * multiple of 64 bits(ex : 0x5c), we are writing as two separate 32 bits
> + * instead of a single 64 bit register write.
> + */
This is not kernel style for multi-lines, pls refer to
Documentation/CodingStyle
> +
> +static inline void vdma_desc_write_64(struct xilinx_vdma_chan *chan, u32 reg,
> + u32 value_lsb, u32 value_msb)
> +{
> + /* Write the lsb 32 bits*/
> + writel(value_lsb, chan->xdev->regs + chan->desc_offset + reg);
> +
> + /* Write the msb 32 bits */
> + writel(value_msb, chan->xdev->regs + chan->desc_offset + reg + 4);
why not writeq
> + err = of_property_read_u32(node, "xlnx,addrwidth", &addr_width);
> +
> + if (err < 0) {
> + /* Setting addr_width property to default 32 bits */
> + addr_width = 32;
> + }
braces for a single line statement! Also space is redandant before if
condition
--
~Vinod
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