netdev - Re: [PATCH v2 15/19] clk: imx6ul: fix enet1 gate configuration

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Message-ID: <20230130121530.GA10978@pengutronix.de>
Date:   Mon, 30 Jan 2023 13:15:30 +0100
From:   Oleksij Rempel <o.rempel@...gutronix.de>
To:     Abel Vesa <abel.vesa@...aro.org>
Cc:     Richard Cochran <richardcochran@...il.com>,
        devicetree@...r.kernel.org, kernel@...gutronix.de,
        Stephen Boyd <sboyd@...nel.org>,
        Fabio Estevam <festevam@...il.com>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        linux-clk@...r.kernel.org, Russell King <linux@...linux.org.uk>,
        linux-kernel@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
        NXP Linux Team <linux-imx@....com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        netdev@...r.kernel.org, Shawn Guo <shawnguo@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Abel Vesa <abelvesa@...nel.org>
Subject: Re: [PATCH v2 15/19] clk: imx6ul: fix enet1 gate configuration

On Sun, Jan 29, 2023 at 07:32:31PM +0200, Abel Vesa wrote:
> On 23-01-17 07:14:49, Oleksij Rempel wrote:
> > According to the "i.MX 6UltraLite Applications Processor Reference Manual,
> > Rev. 2, 03/2017", BIT(13) is ENET1_125M_EN which is not controlling root
> > of PLL6. It is controlling ENET1 separately.
> > 
> > So, instead of this picture (implementation before this patch):
> > fec1 <- enet_ref (divider) <---------------------------,
> >                                                        |- pll6_enet (gate)
> > fec2 <- enet2_ref_125m (gate) <- enet2_ref (divider) <-´
> > 
> > we should have this one (after this patch):
> > fec1 <- enet1_ref_125m (gate) <- enet1_ref (divider) <-,
> >                                                        |- pll6_enet
> > fec2 <- enet2_ref_125m (gate) <- enet2_ref (divider) <-´
> > 
> > With this fix, the RMII reference clock will be turned off, after
> > setting network interface down on each separate interface
> > (ip l s dev eth0 down). Which was not working before, on system with both
> > FECs enabled.
> > 
> > Signed-off-by: Oleksij Rempel <o.rempel@...gutronix.de>
> 
> I'm OK with this. Maybe a fixes tag ?

Hm. Initial commit was:
Fixes: 787b4271a6a0 ("clk: imx: add imx6ul clk tree support")
but this patch will not apply on top of it.
Next possible commit would be:
Fixes: 1487b60dc2d2 ("clk: imx6ul: Switch to clk_hw based API")
But this patch didn't introduce this issue, it was just refactoring.

What do you prefer?

Regards,
Oleksij
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