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Date:   Thu, 7 May 2020 23:37:32 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Grygorii Strashko <grygorii.strashko@...com>
Cc:     Clay McClure <clay@...mons.net>, kbuild test robot <lkp@...el.com>,
        Russell King <linux@...linux.org.uk>,
        Tony Lindgren <tony@...mide.com>,
        "David S. Miller" <davem@...emloft.net>,
        Murali Karicheri <m-karicheri2@...com>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Andrew Jeffery <andrew@...id.au>,
        Santosh Shilimkar <santosh.shilimkar@...cle.com>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Ilias Apalodimas <ilias.apalodimas@...aro.org>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ivan Khoronzhuk <ivan.khoronzhuk@...aro.org>,
        Jakub Kicinski <kuba@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Pankaj Bharadiya <pankaj.laxminarayan.bharadiya@...el.com>,
        Richard Cochran <richardcochran@...il.com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        linux-omap <linux-omap@...r.kernel.org>,
        Networking <netdev@...r.kernel.org>
Subject: Re: [PATCH v2] net: ethernet: ti: Remove TI_CPTS_MOD workaround

On Wed, May 6, 2020 at 10:57 PM Grygorii Strashko
<grygorii.strashko@...com> wrote:
> On 06/05/2020 09:51, Clay McClure wrote:
> > On Tue, May 05, 2020 at 10:41:26AM +0300, Grygorii Strashko wrote:

> >
>
> Ok. After some thinking and hence you commit b6d49cab44b5 ("net: Make PTP-specific drivers depend on PTP_1588_CLOCK")
> seems was merged in net (not net-next)
> 1) for-net: defconfig changes can be separated to fix build fail, but add change for multi_v7_defconfig
> 2) for-net-next: rest of changes plus below diff on top of it
>
> diff --git a/drivers/net/ethernet/ti/Kconfig b/drivers/net/ethernet/ti/Kconfig
> index f3f8bb724294..62f809b67469 100644
> --- a/drivers/net/ethernet/ti/Kconfig
> +++ b/drivers/net/ethernet/ti/Kconfig
> @@ -49,6 +49,7 @@ config TI_CPSW_PHY_SEL
>   config TI_CPSW
>          tristate "TI CPSW Switch Support"
>          depends on ARCH_DAVINCI || ARCH_OMAP2PLUS || COMPILE_TEST
> +       depends on TI_CPTS || !TI_CPTS
>          select TI_DAVINCI_MDIO
>          select MFD_SYSCON
>          select PAGE_POOL
> @@ -64,6 +65,7 @@ config TI_CPSW_SWITCHDEV
>          tristate "TI CPSW Switch Support with switchdev"
>          depends on ARCH_DAVINCI || ARCH_OMAP2PLUS || COMPILE_TEST
>          depends on NET_SWITCHDEV
> +       depends on TI_CPTS || !TI_CPTS
>          select PAGE_POOL
>          select TI_DAVINCI_MDIO
>          select MFD_SYSCON
> @@ -78,11 +80,9 @@ config TI_CPSW_SWITCHDEV
>
>   config TI_CPTS
>          tristate "TI Common Platform Time Sync (CPTS) Support"
> -       depends on TI_CPSW || TI_KEYSTONE_NETCP || TI_CPSW_SWITCHDEV || COMPILE_TEST
> +       depends on ARCH_OMAP2PLUS || ARCH_KEYSTONE || COMPILE_TEST
>          depends on COMMON_CLK
>          depends on PTP_1588_CLOCK
> -       default y if TI_CPSW=y || TI_KEYSTONE_NETCP=y || TI_CPSW_SWITCHDEV=y
> -       default m
>          ---help---
>            This driver supports the Common Platform Time Sync unit of
>            the CPSW Ethernet Switch and Keystone 2 1g/10g Switch Subsystem.
> @@ -109,6 +109,7 @@ config TI_KEYSTONE_NETCP
>          select TI_DAVINCI_MDIO
>          depends on OF
>          depends on KEYSTONE_NAVIGATOR_DMA && KEYSTONE_NAVIGATOR_QMSS
> +       depends on TI_CPTS || !TI_CPTS
>          ---help---
>            This driver supports TI's Keystone NETCP Core.
>
> It should properly resolve "M" vs "Y" dependencies between
>   PTP_1588_CLOCK->TI_CPTS->TI_CPSW
>
> On thing, TI_CPTS can be selected without TI_CPSW, but it's probably ok.

I think that solution is reasonable. I had come up with a different
for when I ran
into the build failure, but I like yours better. Here is my patch, for
reference:


commit 94233d78655876f735189890eb40ef33c49e8523 (HEAD -> randconfig)
Author: Arnd Bergmann <arnd@...db.de>
Date:   Thu May 7 21:25:59 2020 +0200

    cpsw: fix cpts link failure

    When CONFIG_PTP_1588_CLOCK is a loadable module, trying to build cpts
    support into the built-in cpsw driver results in a link error:

    arm-linux-gnueabi-ld: drivers/net/ethernet/ti/cpsw.o: in function
`cpsw_probe':
    cpsw.c:(.text+0x918): undefined reference to `cpts_release'
    arm-linux-gnueabi-ld: drivers/net/ethernet/ti/cpsw.o: in function
`cpsw_remove':
    cpsw.c:(.text+0x1048): undefined reference to `cpts_release'
    arm-linux-gnueabi-ld: drivers/net/ethernet/ti/cpsw.o: in function
`cpsw_rx_handler':
    cpsw.c:(.text+0x12c0): undefined reference to `cpts_rx_timestamp'
    arm-linux-gnueabi-ld: drivers/net/ethernet/ti/cpsw.o: in function
`cpsw_ndo_open':

    Add a dependency for CPTS that only allows it to be enabled when
    doing so does not cause link-time probles.

    Fixes: b6d49cab44b5 ("net: Make PTP-specific drivers depend on
PTP_1588_CLOCK")
    Signed-off-by: Arnd Bergmann <arnd@...db.de>

diff --git a/drivers/net/ethernet/ti/Kconfig b/drivers/net/ethernet/ti/Kconfig
index 4ab35ce7b451..571caf4192c5 100644
--- a/drivers/net/ethernet/ti/Kconfig
+++ b/drivers/net/ethernet/ti/Kconfig
@@ -79,6 +79,9 @@ config TI_CPSW_SWITCHDEV
 config TI_CPTS
        bool "TI Common Platform Time Sync (CPTS) Support"
        depends on TI_CPSW || TI_KEYSTONE_NETCP || TI_CPSW_SWITCHDEV
|| COMPILE_TEST
+       depends on TI_CPSW=n || TI_CPSW=PTP_1588_CLOCK || PTP_1588_CLOCK=y
+       depends on TI_KEYSTONE_NETCP=n ||
TI_KEYSTONE_NETCP=PTP_1588_CLOCK || PTP_1588_CLOCK=y
+       depends on TI_CPSW_SWITCHDEV=n ||
TI_CPSW_SWITCHDEV=PTP_1588_CLOCK || PTP_1588_CLOCK=y
        depends on COMMON_CLK
        depends on POSIX_TIMERS
        ---help---

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