From: Geert Uytterhoeven <geert@linux-m68k.org>
To: Adam Ford <aford173@gmail.com>
Cc: netdev <netdev@vger.kernel.org>,
Adam Ford-BE <aford@beaconembedded.com>,
Sergei Shtylyov <sergei.shtylyov@gmail.com>,
"David S. Miller" <davem@davemloft.net>,
Jakub Kicinski <kuba@kernel.org>,
Rob Herring <robh+dt@kernel.org>,
Linux-Renesas <linux-renesas-soc@vger.kernel.org>,
"open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS"
<devicetree@vger.kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH V4 2/2] net: ethernet: ravb: Enable optional refclk
Date: Tue, 13 Apr 2021 09:33:23 +0200 [thread overview]
Message-ID: <CAMuHMdU5RfTGs3SCvJX9epKBLOo6o1BQMng49RjrBn+P7QOSeg@mail.gmail.com> (raw)
In-Reply-To: <20210412132619.7896-2-aford173@gmail.com>
Hi Adam,
On Mon, Apr 12, 2021 at 3:27 PM Adam Ford <aford173@gmail.com> wrote:
> For devices that use a programmable clock for the AVB reference clock,
> the driver may need to enable them. Add code to find the optional clock
> and enable it when available.
>
> Signed-off-by: Adam Ford <aford173@gmail.com>
> Reviewed-by: Andrew Lunn <andrew@lunn.ch>
>
> ---
> V4: Eliminate the NULL check when disabling refclk, and add a line
> to disable the refclk if there is a failure after it's been
> initialized.
Thanks for the update!
> --- a/drivers/net/ethernet/renesas/ravb_main.c
> +++ b/drivers/net/ethernet/renesas/ravb_main.c
> @@ -2148,6 +2148,13 @@ static int ravb_probe(struct platform_device *pdev)
> goto out_release;
> }
>
> + priv->refclk = devm_clk_get_optional(&pdev->dev, "refclk");
> + if (IS_ERR(priv->refclk)) {
> + error = PTR_ERR(priv->refclk);
> + goto out_release;
Note that this will call clk_disable_unprepare() in case of failure, which is
fine, as that function is a no-op in case of a failed clock.
> + }
> + clk_prepare_enable(priv->refclk);
> +
> ndev->max_mtu = 2048 - (ETH_HLEN + VLAN_HLEN + ETH_FCS_LEN);
> ndev->min_mtu = ETH_MIN_MTU;
>
> @@ -2244,6 +2251,7 @@ static int ravb_probe(struct platform_device *pdev)
> if (chip_id != RCAR_GEN2)
> ravb_ptp_stop(ndev);
> out_release:
> + clk_disable_unprepare(priv->refclk);
> free_netdev(ndev);
>
> pm_runtime_put(&pdev->dev);
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
next prev parent reply other threads:[~2021-04-13 7:33 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-12 13:26 [PATCH V4 1/2] dt-bindings: net: renesas,etheravb: Add additional clocks Adam Ford
2021-04-12 13:26 ` [PATCH V4 2/2] net: ethernet: ravb: Enable optional refclk Adam Ford
2021-04-13 7:33 ` Geert Uytterhoeven [this message]
2021-04-14 13:07 ` Adam Ford
2021-04-14 17:59 ` Geert Uytterhoeven
2021-04-12 21:20 ` [PATCH V4 1/2] dt-bindings: net: renesas,etheravb: Add additional clocks patchwork-bot+netdevbpf
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