[U-Boot] [PATCH v2] DW SPI: Get clock value from Device Tree

[Alexey Brodkin]

Hi Jagan,

> -----Original Message-----
> From: Eugeniy Paltsev [mailto:paltsev at synopsys.com]
> Sent: Tuesday, October 17, 2017 4:33 PM
> To: jagannadh.teki at gmail.com
> Cc: u-boot at lists.denx.de; uboot-snps-arc at synopsys.com
> Subject: [uboot-snps-arc] Re: [PATCH v2] DW SPI: Get clock value from Device Tree
> >
> > How hard it is to make others to use clock manager? do you have any list?
> 
> clock_manager.h is an old (and non-generic) way to deal with different clocks.
> For example in SOCFPGA_GEN5 and SOCFPGA_ARRIA10 clock_manager.h provides
> cm_get_spi_controller_clk_hz function to deal with spi controller clock.
> 
> But today we have another, linux-like alternative: to bind clocks via device tree
> and manipulate with clocks via generic functions provided by clk.h
> 
> In this patch I added option to get clock via device tree using standard bindings
> and restrict clock_manager.h functions usage only to targets which still use it,
> so new targets can simply bind clock via device tree and they do not need to
> implement/define something in clock_manager.h
> 
> So we don't need to make others to use clock manager :)

Maybe it worth trying the other way around and think about switching SOCFPGA platforms to
generic clk framework?

Marek, any plans for that?

-Alexey