linux-kernel - Re: [PATCH v4 1/2] drm/bridge: sil_sii8620: make remote control optional.

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Message-ID: <b50b902d-d145-5442-389c-8fd0f73e2f87@samsung.com>
Date:   Mon, 8 Apr 2019 07:49:18 +0200
From:   Andrzej Hajda <a.hajda@...sung.com>
To:     Ronald Tschalär <ronald@...ovation.ch>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Henrik Rydberg <rydberg@...math.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Lukas Wunner <lukas@...ner.de>,
        Federico Lorenzi <federico@...velground.com>,
        linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
        Inki Dae <inki.dae@...sung.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>
Subject: Re: [PATCH v4 1/2] drm/bridge: sil_sii8620: make remote control
 optional.

On 07.04.2019 07:03, Ronald Tschalär wrote:
> commit d6abe6df706c (drm/bridge: sil_sii8620: do not have a dependency
> of RC_CORE) changed the driver to select both RC_CORE and INPUT.
> However, this causes problems with other drivers, in particular an input
> driver that depends on MFD_INTEL_LPSS_PCI (to be added in a separate
> commit):
>
>   drivers/clk/Kconfig:9:error: recursive dependency detected!
>   drivers/clk/Kconfig:9:        symbol COMMON_CLK is selected by MFD_INTEL_LPSS
>   drivers/mfd/Kconfig:566:      symbol MFD_INTEL_LPSS is selected by MFD_INTEL_LPSS_PCI
>   drivers/mfd/Kconfig:580:      symbol MFD_INTEL_LPSS_PCI is implied by KEYBOARD_APPLESPI
>   drivers/input/keyboard/Kconfig:73:    symbol KEYBOARD_APPLESPI depends on INPUT
>   drivers/input/Kconfig:8:      symbol INPUT is selected by DRM_SIL_SII8620
>   drivers/gpu/drm/bridge/Kconfig:83:    symbol DRM_SIL_SII8620 depends on DRM_BRIDGE
>   drivers/gpu/drm/bridge/Kconfig:1:     symbol DRM_BRIDGE is selected by DRM_PL111
>   drivers/gpu/drm/pl111/Kconfig:1:      symbol DRM_PL111 depends on COMMON_CLK
>
> According to the docs and general consensus, select should only be used
> for non user-visible symbols, but both RC_CORE and INPUT are
> user-visible. Furthermore almost all other references to INPUT
> throughout the kernel config are depends, not selects. For this reason
> the first part of this change reverts commit d6abe6df706c.
>
> In order to address the original reason for commit d6abe6df706c, namely
> that not all boards use the remote controller functionality and hence
> should not need have to deal with RC_CORE, the second part of this
> change now makes the remote control support in the driver optional and
> contingent on RC_CORE being defined. And with this the hard dependency
> on INPUT also goes away as that is only needed if RC_CORE is defined
> (which in turn already depends on INPUT).
>
> CC: Inki Dae <inki.dae@...sung.com>
> CC: Andrzej Hajda <a.hajda@...sung.com>
> CC: Laurent Pinchart <laurent.pinchart@...asonboard.com>
> CC: Dmitry Torokhov <dmitry.torokhov@...il.com>
> Signed-off-by: Ronald Tschalär <ronald@...ovation.ch>
Reviewed-by: Andrzej Hajda <a.hajda@...sung.com>

 --
Regards
Andrzej