linux-kernel - Re: [PATCH 1/3] net: ti: icssg-prueth: Enable PTP timestamping support for SR1.0 devices

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Date: Thu, 30 May 2024 11:43:08 -0700
From: Jacob Keller <jacob.e.keller@...el.com>
To: Diogo Ivo <diogo.ivo@...mens.com>, MD Danish Anwar <danishanwar@...com>,
	Roger Quadros <rogerq@...nel.org>, "David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, "Paolo
 Abeni" <pabeni@...hat.com>, Richard Cochran <richardcochran@...il.com>,
	Nishanth Menon <nm@...com>, Vignesh Raghavendra <vigneshr@...com>, "Tero
 Kristo" <kristo@...nel.org>, Rob Herring <robh@...nel.org>, "Krzysztof
 Kozlowski" <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, "Jan
 Kiszka" <jan.kiszka@...mens.com>
CC: <linux-arm-kernel@...ts.infradead.org>, <netdev@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>
Subject: Re: [PATCH 1/3] net: ti: icssg-prueth: Enable PTP timestamping
 support for SR1.0 devices



On 5/29/2024 9:05 AM, Diogo Ivo wrote:
> Enable PTP support for AM65x SR1.0 devices by registering with the IEP
> infrastructure in order to expose a PTP clock to userspace.
> 
> Signed-off-by: Diogo Ivo <diogo.ivo@...mens.com>
> ---
>  drivers/net/ethernet/ti/icssg/icssg_prueth_sr1.c | 49 +++++++++++++++++++++++-
>  1 file changed, 48 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/ti/icssg/icssg_prueth_sr1.c b/drivers/net/ethernet/ti/icssg/icssg_prueth_sr1.c
> index 7b3304bbd7fc..01cad01965dc 100644
> --- a/drivers/net/ethernet/ti/icssg/icssg_prueth_sr1.c
> +++ b/drivers/net/ethernet/ti/icssg/icssg_prueth_sr1.c
> @@ -1011,16 +1011,42 @@ static int prueth_probe(struct platform_device *pdev)
>  	dev_dbg(dev, "sram: pa %llx va %p size %zx\n", prueth->msmcram.pa,
>  		prueth->msmcram.va, prueth->msmcram.size);
>  
> +	prueth->iep0 = icss_iep_get_idx(np, 0);
> +	if (IS_ERR(prueth->iep0)) {
> +		ret = dev_err_probe(dev, PTR_ERR(prueth->iep0), "iep0 get failed\n");
> +		goto free_pool;
> +	}
> +
> +	prueth->iep1 = icss_iep_get_idx(np, 1);
> +	if (IS_ERR(prueth->iep1)) {
> +		ret = dev_err_probe(dev, PTR_ERR(prueth->iep1), "iep1 get failed\n");
> +		goto put_iep0;
> +	}
> +
> +	ret = icss_iep_init(prueth->iep0, NULL, NULL, 0);
> +	if (ret) {
> +		dev_err_probe(dev, ret, "failed to init iep0\n");
> +		goto put_iep;
> +	}
> +
> +	ret = icss_iep_init(prueth->iep1, NULL, NULL, 0);
> +	if (ret) {
> +		dev_err_probe(dev, ret, "failed to init iep1\n");
> +		goto exit_iep0;
> +	}
> +

Once initialized, the icss_iep driver logic must implement the actual
PTP clock interfaces?

Neat.

Reviewed-by: Jacob Keller <jacob.e.keller@...el.com>