linux-kernel - Re: [PATCH] soc: sunxi: Fix missing dependency on REGMAP

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Date:   Mon, 1 Apr 2019 10:29:43 -0500
From:   Bin Liu <b-liu@...com>
To:     Maxime Ripard <maxime.ripard@...tlin.com>
CC:     Samuel Holland <samuel@...lland.org>, Chen-Yu Tsai <wens@...e.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <linux-usb@...r.kernel.org>,
        <linux-sunxi@...glegroups.com>
Subject: Re: [PATCH] soc: sunxi: Fix missing dependency on REGMAP_MMIO

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?

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

Regards,
-Bin.