netdev - Re: [PATCH net-next v2] ptp: add Alibaba CIPU PTP clock driver

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Message-ID: <69ee8a60-3134-4b7a-8217-be9bbc79a8fa@lunn.ch>
Date: Fri, 27 Jun 2025 09:46:26 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Wen Gu <guwen@...ux.alibaba.com>
Cc: richardcochran@...il.com, andrew+netdev@...n.ch, davem@...emloft.net,
	edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
	xuanzhuo@...ux.alibaba.com, dust.li@...ux.alibaba.com,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next v2] ptp: add Alibaba CIPU PTP clock driver

> +#define DRV_VER_MAJOR		1
> +#define DRV_VER_MINOR		3
> +#define DRV_VER_SUBMINOR	0

> +#define LINUX_UPSTREAM		0x1F

> +static int ptp_cipu_set_drv_version(struct ptp_cipu_ctx *ptp_ctx)
> +{
> +	struct ptp_cipu_regs *regs = &ptp_ctx->regs;
> +	int version, patchlevel, sublevel;
> +	u32 env_ver, drv_ver;
> +	int rc;
> +
> +	if (sscanf(utsname()->release, "%u.%u.%u",
> +		   &version, &patchlevel, &sublevel) != 3)
> +		return -EINVAL;
> +	sublevel = sublevel < 0xFF ? sublevel : 0xFF;
> +
> +	env_ver = (LINUX_UPSTREAM << 27) | (version << 16) |
> +		  (patchlevel << 8) | sublevel;
> +
> +	rc = cipu_iowrite32_and_check(ptp_ctx->reg_addr +
> +				      PTP_CIPU_REG(env_ver),
> +				      env_ver, &regs->env_ver);
> +	if (rc)
> +		return rc;
> +
> +	drv_ver = (DRV_TYPE << 24) | (DRV_VER_MAJOR << 16) |
> +		  (DRV_VER_MINOR << 8) | DRV_VER_SUBMINOR;
> +
> +	return cipu_iowrite32_and_check(ptp_ctx->reg_addr +
> +					PTP_CIPU_REG(drv_ver), drv_ver,
> +					&regs->drv_ver);
> +}

Please could you explain what this is doing.

	Andrew