linux-kernel - [PATCH v3 0/2] pinctrl: make MediaTek pinctrl v2 driver and MT6765 pinctrl driver ready for building loadable module

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Date:   Tue, 25 Feb 2020 15:38:49 +0800
From:   <light.hsieh@...iatek.com>
To:     <linus.walleij@...aro.org>
CC:     <linux-mediatek@...ts.infradead.org>, <linux-gpio@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <sean.wang@...nel.org>,
        <kuohong.wang@...iatek.com>, Light Hsieh <light.hsieh@...iatek.com>
Subject: [PATCH v3 0/2] pinctrl: make MediaTek pinctrl v2 driver and MT6765 pinctrl driver ready for building loadable module

From: Light Hsieh <light.hsieh@...iatek.com>

In the future we want to be able to build the MediaTek pinctrl driver,
based on paris, as kernel module. This patch allows pinctrl-paris.c, the
external interrupt controller mtk-eint.c, and pinctrl-mtk-common-v2.c to
be loadable as module.

The following is the rationale for determining whether mtk-eint.c,
pinctrl-mtk-common-v2.c, and pinctrl-paris.c are built as loadable module:

1. drivers/pinctrl/mediatek/Kconfig:
1.1 PINCTRL_MTXXXX: change from bool to tristate. It is specified in
        defconfig file. MTXXXX can only be the user of pinctrl-paris,
        which can MT6765 or MT8183. The patch for changing
        PINCTRL_MT6765 from bool to tristate will be given as the next
        patch of the patch series.
1.2 PINCTRL_MTK_PARIS: change from bool to tristate and select
        PINCTRL_MTK_V2. No need to specify in defconfig file.
      * PINCTRL_MTK_PARIS will be y if any PINCTRL_MTXXXX selecting
        PINCTRL_MTK_PARIS is y.
      * PINCTRL_MTK_PARIS will be n if all PINCTRL_MTXXXX selecting
        PINCTRL_MTK_PARIS is n.
      * PINCTRL_MTK_PARIS will be m if some PINCTRL_MTXXXX selecting
        PINCTRL_MTK_PARIS are m and other PINCTRL_MTXXXX selecting
        PINCTRL_MTK_PARIS are n.
1.3 PINCTRL_MTK_MOORE: select EINT_MTK and PINCTRL_MTK_V2. It is make
        to be ready for building as loadable kernel module because it
        is not used on Android kernel.        
1.4 PINCTRL_MTK_V2: add this tristate config which depends on
        PINCTRL_MTK_PARIS and PINCTRL_MTK_MOORE. No need to specify in 
        defconfig file.
      * PINCTRL_MTK_V2 will be y if either PINCTRL_MTK_PARIS or
        PINCTRL_MTK_MOORE is y.
      * PINCTRL_MTK_V2 will be n if both PINCTRL_MTK_PARIS and
        PINCTRL_MTK_MOORE are n.
      * PINCTRL_MTK_V2 will be m if PINCTRL_MTK_PARIS is m and
        PINCTRL_MTK_MOORE is n.
1.5 EINT_MTK: change from bool to tristate and add rule for default.
        No need to specify in defconfig file.
      * First rule: determine if EINT_MTK is y or n according to 
        selection of PINCTRL_MTK or PINCTRL_MTK_MORE.
      * Second rule: determine if EINT_MTK is y, m, or n according to
        selection of PINCTRL_MTK_PARIS.

2. drivers/pinctrl/mediatek/Makefile: Use PINCTRL_MTK_V2 to determine
        if pinctrl-mtk-common-v2.c is built as loadable module or
        built-in.

Light Hsieh (2):
  pinctrl: make MediaTek pinctrl v2 driver ready for buidling loadable
    module
  pinctrl: make MediaTek MT6765 pinctrl ready for buidling loadable
    module

 drivers/pinctrl/mediatek/Kconfig                 | 15 ++++++++++++---
 drivers/pinctrl/mediatek/Makefile                |  5 +++--
 drivers/pinctrl/mediatek/mtk-eint.c              |  9 +++++++++
 drivers/pinctrl/mediatek/pinctrl-mt6765.c        |  4 ++++
 drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c | 24 ++++++++++++++++++++++++
 drivers/pinctrl/mediatek/pinctrl-paris.c         |  5 +++++
 drivers/pinctrl/pinconf-generic.c                |  1 +
 7 files changed, 58 insertions(+), 5 deletions(-)

-- 
1.8.1.1.dirty