[PATCH v1 13/15] aspeed: Add support for Clocks needed by MACs

[Simon Glass]

On 17 April 2017 at 13:00, Maxim Sloyko <maxims at google.com> wrote:
> Add support for clocks needed by MACs to ast2500 clock driver.
> The clocks are D2-PLL, which is used by both MACs and PCLK_MAC1 and
> PCLK_MAC2 for MAC1 and MAC2 respectively.
>
> The rate of D2-PLL is hardcoded to 250MHz -- the value used in Aspeed
> SDK. It is not entirely clear from the datasheet how this clock is used
> by MACs, so not clear if the rate would ever need to be different. So,
> for now, hardcoding it is probably safer.
>
> The rate of PCLK_MAC{1,2} is chosen based on MAC speed selected through
> hardware strapping.
>
> So, the network driver would only need to enable these clocks, no need
> to configure the rate.
>
> Signed-off-by: Maxim Sloyko <maxims at google.com>
> ---
>
> Changes in v1: None
>
>  arch/arm/dts/ast2500-u-boot.dtsi               |   8 +
>  arch/arm/include/asm/arch-aspeed/scu_ast2500.h |  62 +++++-
>  drivers/clk/aspeed/clk_ast2500.c               | 265 ++++++++++++++++++++++---
>  include/dt-bindings/clock/ast2500-scu.h        |   2 +
>  4 files changed, 304 insertions(+), 33 deletions(-)

Reviewed-by: Simon Glass <sjg at chromium.org>

Wow that 10ms delay is pretty unfortunate!