netdev - Re: [PATCH v1] ptp: add ToD device driver for Intel FPGA cards

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Date:   Mon, 13 Mar 2023 11:49:53 -0700
From:   Richard Cochran <richardcochran@...il.com>
To:     Tianfei Zhang <tianfei.zhang@...el.com>
Cc:     netdev@...r.kernel.org, linux-fpga@...r.kernel.org,
        ilpo.jarvinen@...ux.intel.com, andriy.shevchenko@...ux.intel.com,
        russell.h.weight@...el.com, matthew.gerlach@...ux.intel.com,
        pierre-louis.bossart@...ux.intel.com, vinicius.gomes@...el.com,
        Raghavendra Khadatare <raghavendrax.anand.khadatare@...el.com>
Subject: Re: [PATCH v1] ptp: add ToD device driver for Intel FPGA cards

On Sun, Mar 12, 2023 at 11:02:39PM -0400, Tianfei Zhang wrote:


> +static int dfl_tod_probe(struct dfl_device *ddev)
> +{
> +	struct device *dev = &ddev->dev;
> +	struct dfl_tod *dt;
> +
> +	dt = devm_kzalloc(dev, sizeof(*dt), GFP_KERNEL);
> +	if (!dt)
> +		return -ENOMEM;
> +
> +	dt->tod_ctrl = devm_ioremap_resource(dev, &ddev->mmio_res);
> +	if (IS_ERR(dt->tod_ctrl))
> +		return PTR_ERR(dt->tod_ctrl);
> +
> +	dt->dev = dev;
> +	spin_lock_init(&dt->tod_lock);
> +	dev_set_drvdata(dev, dt);
> +
> +	dt->ptp_clock_ops = dfl_tod_clock_ops;
> +
> +	dt->ptp_clock = ptp_clock_register(&dt->ptp_clock_ops, dev);
> +	if (IS_ERR(dt->ptp_clock))
> +		return dev_err_probe(dt->dev, PTR_ERR(dt->ptp_clock),
> +				     "Unable to register PTP clock\n");

Need to handle NULL as well...

/**
 * ptp_clock_register() - register a PTP hardware clock driver
 *
 * @info:   Structure describing the new clock.
 * @parent: Pointer to the parent device of the new clock.
 *
 * Returns a valid pointer on success or PTR_ERR on failure.  If PHC
 * support is missing at the configuration level, this function
 * returns NULL, and drivers are expected to gracefully handle that
 * case separately.
 */

Thanks,
Richard