linux-kernel - Re: [PATCH v2] soc: sunxi: Fix missing dependency on REGMAP

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Date:   Tue, 2 Apr 2019 08:09:01 +0200
From:   Maxime Ripard <maxime.ripard@...tlin.com>
To:     Samuel Holland <samuel@...lland.org>
Cc:     Chen-Yu Tsai <wens@...e.org>, Bin Liu <b-liu@...com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-usb@...r.kernel.org, linux-sunxi@...glegroups.com,
        stable@...r.kernel.org
Subject: Re: [PATCH v2] soc: sunxi: Fix missing dependency on REGMAP_MMIO

On Mon, Apr 01, 2019 at 05:03:31PM -0500, 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.
>
> Cc: <stable@...r.kernel.org> # 4.19
> Fixes: 5828729bebbb ("soc: sunxi: export a regmap for EMAC clock reg on A64")
> Signed-off-by: Samuel Holland <samuel@...lland.org>

Acked-by: Maxime Ripard <maxime.ripard@...tlin.com>

Maxime

--
Maxime Ripard, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com