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

[Andrew Lunn]

> +#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