linux-kernel - Re: [Patch net-next v1 01/12] net: dsa: microchip: ptp: add the posix clock support

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Message-ID: <CALs4sv19Efi0oKVqRqRFtF2SCr6Phejh4RFvuRN1UCkdvcKJeg@mail.gmail.com>
Date:   Mon, 28 Nov 2022 20:19:33 +0530
From:   Pavan Chebbi <pavan.chebbi@...adcom.com>
To:     Arun Ramadoss <arun.ramadoss@...rochip.com>
Cc:     linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        woojung.huh@...rochip.com, UNGLinuxDriver@...rochip.com,
        andrew@...n.ch, vivien.didelot@...il.com, f.fainelli@...il.com,
        olteanv@...il.com, davem@...emloft.net, edumazet@...gle.com,
        kuba@...nel.org, pabeni@...hat.com, linux@...linux.org.uk,
        Tristram.Ha@...rochip.com, richardcochran@...il.com,
        ceggers@...i.de
Subject: Re: [Patch net-next v1 01/12] net: dsa: microchip: ptp: add the posix
 clock support

On Mon, Nov 28, 2022 at 4:03 PM Arun Ramadoss
<arun.ramadoss@...rochip.com> wrote:

> diff --git a/drivers/net/dsa/microchip/ksz_ptp_reg.h b/drivers/net/dsa/microchip/ksz_ptp_reg.h
> new file mode 100644
> index 000000000000..e578a0006ecf
> --- /dev/null
> +++ b/drivers/net/dsa/microchip/ksz_ptp_reg.h
> @@ -0,0 +1,57 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/* Microchip KSZ PTP register definitions
> + * Copyright (C) 2022 Microchip Technology Inc.
> + */
> +
> +#ifndef __KSZ_PTP_REGS_H
> +#define __KSZ_PTP_REGS_H
> +
> +/* 5 - PTP Clock */
> +#define REG_PTP_CLK_CTRL               0x0500
> +
> +#define PTP_STEP_ADJ                   BIT(6)
> +#define PTP_STEP_DIR                   BIT(5)
> +#define PTP_READ_TIME                  BIT(4)
> +#define PTP_LOAD_TIME                  BIT(3)

PTP_WRITE_TIME sounds more intuitive than PTP_LOAD_TIME?
Also I see that all the #defines are introduced in this patch, some of
which are used later. It is a good idea to introduce the #defines in
the same patches where they are being used for the first time.
I will be looking at the entire series but am responding to this now.

> +#define PTP_CLK_ADJ_ENABLE             BIT(2)
> +#define PTP_CLK_ENABLE                 BIT(1)
> +#define PTP_CLK_RESET                  BIT(0)
> +
> +#define REG_PTP_RTC_SUB_NANOSEC__2     0x0502
> +
> +#define PTP_RTC_SUB_NANOSEC_M          0x0007
> +#define PTP_RTC_0NS                    0x00
> +
> +#define REG_PTP_RTC_NANOSEC            0x0504
> +#define REG_PTP_RTC_NANOSEC_H          0x0504
> +#define REG_PTP_RTC_NANOSEC_L          0x0506
> +
> +#define REG_PTP_RTC_SEC                        0x0508
> +#define REG_PTP_RTC_SEC_H              0x0508
> +#define REG_PTP_RTC_SEC_L              0x050A
> +
> +#define REG_PTP_SUBNANOSEC_RATE                0x050C
> +#define REG_PTP_SUBNANOSEC_RATE_H      0x050C
> +#define PTP_SUBNANOSEC_M               0x3FFFFFFF
> +
> +#define PTP_RATE_DIR                   BIT(31)
> +#define PTP_TMP_RATE_ENABLE            BIT(30)
> +
> +#define REG_PTP_SUBNANOSEC_RATE_L      0x050E
> +
> +#define REG_PTP_RATE_DURATION          0x0510
> +#define REG_PTP_RATE_DURATION_H                0x0510
> +#define REG_PTP_RATE_DURATION_L                0x0512
> +
> +#define REG_PTP_MSG_CONF1              0x0514
> +
> +#define PTP_802_1AS                    BIT(7)
> +#define PTP_ENABLE                     BIT(6)
> +#define PTP_ETH_ENABLE                 BIT(5)
> +#define PTP_IPV4_UDP_ENABLE            BIT(4)
> +#define PTP_IPV6_UDP_ENABLE            BIT(3)
> +#define PTP_TC_P2P                     BIT(2)
> +#define PTP_MASTER                     BIT(1)
> +#define PTP_1STEP                      BIT(0)
> +
> +#endif
> --
> 2.36.1
>

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