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Date:   Fri, 24 May 2019 10:09:58 +0530
From:   Yash Shah <>
To:     Andreas Schwab <>
        Palmer Dabbelt <>,,, Paul Walmsley <>,
        Sachin Ghadi <>
Subject: Re: [PATCH 0/2] net: macb: Add support for SiFive FU540-C000

Hi Andreas,

On Thu, May 23, 2019 at 6:19 PM Andreas Schwab <> wrote:
> On Mai 23 2019, Yash Shah <> wrote:
> > On FU540, the management IP block is tightly coupled with the Cadence
> > MACB IP block. It manages many of the boundary signals from the MACB IP
> > This patchset controls the tx_clk input signal to the MACB IP. It
> > switches between the local TX clock (125MHz) and PHY TX clocks. This
> > is necessary to toggle between 1Gb and 100/10Mb speeds.
> Doesn't work for me:
> [  365.842801] macb: probe of 10090000.ethernet failed with error -17

Make sure you have applied all the patches needed for testing found at
dev/yashs/ethernet branch of:

In addition to that, make sure in your kernel config GPIO_SIFIVE=y
In v2 of this patch, I will add this select GPIO_SIFIVE config in the
Cadence Kconfig file.

- Yash

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