netdev - Re: [PATCH v2] net: ethernet: ti: Remove TI_CPTS

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Message-ID: <1654101f-9dd7-2e10-7344-0d08e32bc309@ti.com>
Date:   Wed, 6 May 2020 23:56:35 +0300
From:   Grygorii Strashko <grygorii.strashko@...com>
To:     Clay McClure <clay@...mons.net>
CC:     Arnd Bergmann <arnd@...db.de>, 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-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <linux-omap@...r.kernel.org>,
        <netdev@...r.kernel.org>
Subject: Re: [PATCH v2] net: ethernet: ti: Remove TI_CPTS_MOD workaround



On 06/05/2020 09:51, Clay McClure wrote:
> On Tue, May 05, 2020 at 10:41:26AM +0300, Grygorii Strashko wrote:
> 
>> It's better if you send v2 not as reply to v1.
> 
> Noted, thank you, and thank you for taking the time to review my patch.
> 
>> just to clarify. After these two patches
>>   - the PTP_1588_CLOCK can still be set to "M"
>>   - which will cause TI_CPTS to be "M",
>>   - but TI_CPSW will still be "Y".
>>
>> and all above will build and produce built-in CPSW without CPTS support
>> and cpts.ko which is loadable, but not functional.
>>
>> Sorry, I'm a little bit lost regarding the target you'are trying to achieve.
>> At least previously "imply PTP_1588_CLOCK" allowed to select properly PTP_1588_CLOCK
>> without modifying every defconfig.
> 
> Well, I just wanted to squelch a WARN_ON(). As Arnd pointed out in [1],
> code that uses the stubbed cpts functions is supposed to gracefully
> handle receiving a null pointer. Splatting a warning is not graceful,
> and that's what I was trying to fix.
> 
> But your question in [2] prompted me to consider whether it should be
> possible to build TI_CPTS without PTP_1588_CLOCK at all. I think the
> answer is no, so I tried to fix it, but you're right, it's still
> possible to end up with a nonfunctional module after my patch.
> 
> If you prefer to revert, that's fine with me. Should I post a patch, or
> just ask David to revert?
> 

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.

-- 
Best regards,
grygorii