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Subject: Re: [linux-sunxi] Re: [PATCH] soc: sunxi: Fix missing dependency on
 REGMAP_MMIO
To:     Bin Liu <b-liu@ti.com>, Maxime Ripard <maxime.ripard@bootlin.com>,
        Chen-Yu Tsai <wens@csie.org>,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org,
        linux-usb@vger.kernel.org, linux-sunxi@googlegroups.com
References: <20190301022044.24431-1-samuel@sholland.org>
 <20190301144348.titicfsmukd3kogj@flea> <20190401152943.GI25852@uda0271908>
From:   Samuel Holland <samuel@sholland.org>
Message-ID: <971c2594-91e0-0567-78fd-979442040209@sholland.org>
Date:   Mon, 1 Apr 2019 17:04:56 -0500
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On 4/1/19 10:29 AM, 'Bin Liu' via linux-sunxi wrote:
> On Fri, Mar 01, 2019 at 03:43:48PM +0100, Maxime Ripard wrote:
>> On Thu, Feb 28, 2019 at 08:20:44PM -0600, Samuel Holland wrote:
>>> When enabling ARCH_SUNXI from allnoconfig, SUNXI_SRAM is enabled, but
>>> not REGMAP_MMIO, so the kernel fails to link with an undefined reference
>>> to __devm_regmap_init_mmio_clk. Select REGMAP_MMIO, as suggested in
>>> drivers/base/regmap/Kconfig.
>>>
>>> This creates the following dependency loop:
>>>
>>>   drivers/of/Kconfig:68:                symbol OF_IRQ depends on IRQ_DOMAIN
>>>   kernel/irq/Kconfig:63:                symbol IRQ_DOMAIN is selected by REGMAP
>>>   drivers/base/regmap/Kconfig:7:        symbol REGMAP default is visible depending on REGMAP_MMIO
>>>   drivers/base/regmap/Kconfig:39:       symbol REGMAP_MMIO is selected by SUNXI_SRAM
>>>   drivers/soc/sunxi/Kconfig:4:          symbol SUNXI_SRAM is selected by USB_MUSB_SUNXI
>>>   drivers/usb/musb/Kconfig:63:          symbol USB_MUSB_SUNXI depends on GENERIC_PHY
>>>   drivers/phy/Kconfig:7:                symbol GENERIC_PHY is selected by PHY_BCM_NS_USB3
>>>   drivers/phy/broadcom/Kconfig:29:      symbol PHY_BCM_NS_USB3 depends on MDIO_BUS
>>>   drivers/net/phy/Kconfig:12:           symbol MDIO_BUS default is visible depending on PHYLIB
>>>   drivers/net/phy/Kconfig:181:          symbol PHYLIB is selected by ARC_EMAC_CORE
>>>   drivers/net/ethernet/arc/Kconfig:18:  symbol ARC_EMAC_CORE is selected by ARC_EMAC
>>>   drivers/net/ethernet/arc/Kconfig:24:  symbol ARC_EMAC depends on OF_IRQ
>>>
>>> To fix the circular dependency, make USB_MUSB_SUNXI select GENERIC_PHY
>>> instead of depending on it. This matches the use of GENERIC_PHY by all
>>> but two other drivers.
> 
> Should this go to stable tree as well? Is a 'Fixes' tag for it?

Yes, I just sent v2 with these tags (although I forgot Maxime's Ack).

>>> Signed-off-by: Samuel Holland <samuel@sholland.org>
>>
>> I assume it would go through the USB tree.
>>
>> Acked-by: Maxime Ripard <maxime.ripard@bootlin.com>

Cheers,
Samuel