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SubjectRe: [PATCH v2 1/1] ARM: dmaengine: sun6i: share the dma driver with sun50i
On Sat, Nov 05, 2016 at 04:05:48PM +0800, Hao Zhang wrote:
> Add soc a64 dma support.
>
> Signed-off-by: Hao Zhang <hao5781286@gmail.com>
> ---
> drivers/dma/sun6i-dma.c | 19 +++++++++++++++++++
> 1 file changed, 19 insertions(+)
>
> diff --git a/drivers/dma/sun6i-dma.c b/drivers/dma/sun6i-dma.c
> index 8346199..00fcfc7 100644
> --- a/drivers/dma/sun6i-dma.c
> +++ b/drivers/dma/sun6i-dma.c
> @@ -1028,11 +1028,23 @@ static struct sun6i_dma_config sun8i_h3_dma_cfg = {
> .nr_max_vchans = 34,
> };
>
> +/*
> + * The A64 has 8 physical channels, a maximum DRQ port id of 27,
> + * and a total of 38 usable source and destination endpoints.
> + */
> +
> +static struct sun6i_dma_config sun50i_a64_dma_cfg = {
> + .nr_max_channels = 8,
> + .nr_max_requests = 27,
> + .nr_max_vchans = 38,
> +};
> +
> static const struct of_device_id sun6i_dma_match[] = {
> { .compatible = "allwinner,sun6i-a31-dma", .data = &sun6i_a31_dma_cfg },
> { .compatible = "allwinner,sun8i-a23-dma", .data = &sun8i_a23_dma_cfg },
> { .compatible = "allwinner,sun8i-a83t-dma", .data = &sun8i_a83t_dma_cfg },
> { .compatible = "allwinner,sun8i-h3-dma", .data = &sun8i_h3_dma_cfg },
> + { .compatible = "allwinner,sun50i-a64-dma", .data = &sun50i_a64_dma_cfg },

You need to add that compatible to the DT binding documentation.

> { /* sentinel */ }
> };
> MODULE_DEVICE_TABLE(of, sun6i_dma_match);
> @@ -1110,6 +1122,13 @@ static int sun6i_dma_probe(struct platform_device *pdev)
> sdc->slave.dst_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
> BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
> BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
> +
> + if (of_device_is_compatible(pdev->dev.of_node,
> + "allwinner,sun50i-a64-dma")) {
> + sdc->slave.src_addr_widths |= BIT(DMA_SLAVE_BUSWIDTH_8_BYTES);
> + sdc->slave.dst_addr_widths |= BIT(DMA_SLAVE_BUSWIDTH_8_BYTES);
> + }
> +

You'll also need to change convert_buswidth, it will reject any width
higher than 4 bytes.

Maxime

--
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com
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