linux-kernel - Re: [PATCH 07/13] net: ravb: Rely on PM domain to enable gptp

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Date:   Wed, 22 Nov 2023 19:59:52 +0300
From:   Sergey Shtylyov <s.shtylyov@....ru>
To:     Claudiu <claudiu.beznea@...on.dev>, <davem@...emloft.net>,
        <edumazet@...gle.com>, <kuba@...nel.org>, <pabeni@...hat.com>,
        <p.zabel@...gutronix.de>, <yoshihiro.shimoda.uh@...esas.com>,
        <geert+renesas@...der.be>, <wsa+renesas@...g-engineering.com>,
        <biju.das.jz@...renesas.com>,
        <prabhakar.mahadev-lad.rj@...renesas.com>,
        <sergei.shtylyov@...entembedded.com>,
        <mitsuhiro.kimura.kc@...esas.com>, <masaru.nagai.vx@...esas.com>
CC:     <netdev@...r.kernel.org>, <linux-renesas-soc@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
Subject: Re: [PATCH 07/13] net: ravb: Rely on PM domain to enable gptp_clk

On 11/20/23 11:46 AM, Claudiu wrote:

> From: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
> 
> ravb_rzv2m_hw_info::gptp_ref_clk is enabled only for RZ/V2M. RZ/V2M
> is an ARM64 based device which selects power domains by default and
> CONFIG_PM. The RZ/V2M Ethernet DT node has proper power-domain binding
> available in device tree from the commit that added the Ethernet node.
> (4872ca1f92b0 ("arm64: dts: renesas: r9a09g011: Add ethernet nodes")).
> 
> Power domain support was available in rzg2l-cpg.c driver when the
> Ethernet DT node has been enabled in RZ/V2M device tree.
> (ef3c613ccd68 ("clk: renesas: Add CPG core wrapper for RZ/G2L SoC")).
> 
> Thus remove the explicit clock enable for gptp_clk (and treat it as the
> other clocks are treated) as it is not needed and removing it doesn't
> break the ABI according to the above explanations.
> 
> By removing the enable/disable operation from the driver we can add
> runtime PM support (which operates on clocks) w/o the need to handle
> the gptp_clk in Ethernet driver functions like ravb_runtime_nop().
> PM domain does all that is needed.
> 
> Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>

Reviewed-by: Sergey Shtylyov <s.shtylyov@....ru>

[...]

MBR, Sergey