[PATCH v5 1/7] riscv: Add DMA 64-bit address support

[Bin Meng]

Hi Padmarao,

On Thu, Dec 3, 2020 at 4:43 AM Padmarao Begari
<padmarao.begari at microchip.com> wrote:
>
> dma_addr_t holds any valid DMA address. If the DMA API only uses 32/64-bit
> addresses, dma_addr_t need only be 32/64 bits wide.
>
> Signed-off-by: Padmarao Begari <padmarao.begari at microchip.com>
> Reviewed-by: Anup Patel <anup.patel at wdc.com>
> ---
>  arch/riscv/Kconfig             | 4 ++++
>  arch/riscv/include/asm/types.h | 4 ++++
>  2 files changed, 8 insertions(+)
>
> diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
> index 30b05408b1..55eaee2da6 100644
> --- a/arch/riscv/Kconfig
> +++ b/arch/riscv/Kconfig
> @@ -152,6 +152,10 @@ config 32BIT
>  config 64BIT
>         bool
>
> +config DMA_ADDR_T_64BIT
> +       bool
> +       default y if 64BIT
> +
>  config SIFIVE_CLINT
>         bool
>         depends on RISCV_MMODE || SPL_RISCV_MMODE
> diff --git a/arch/riscv/include/asm/types.h b/arch/riscv/include/asm/types.h
> index 403cf9a48f..b800b2d221 100644
> --- a/arch/riscv/include/asm/types.h
> +++ b/arch/riscv/include/asm/types.h
> @@ -29,7 +29,11 @@ typedef unsigned short umode_t;
>
>  #include <stddef.h>
>
> +#ifdef CONFIG_DMA_ADDR_T_64BIT
> +typedef u64 dma_addr_t;
> +#else
>  typedef u32 dma_addr_t;
> +#endif

Why is this patch needed for U-Boot?

Regards,
Bin