linux-kernel - [PATCH v6 0/2] pinctr: mediatek: make MediaTek pinctrl-paris and related driver ready for buidling loadable module

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Date:   Tue, 7 Apr 2020 15:22:08 +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 v6 0/2] pinctr: mediatek: make MediaTek pinctrl-paris and related driver ready for buidling loadable module

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

pinctrl: mediatek: make MediaTek pinctrl v2 driver ready for buidling loadable module

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: mediatek: make MediaTek pinctrl v2 driver ready for buidling
    loadable module
  pinctrl: mediatek: make MediaTek MT6765 pinctrl ready for buiding
    loadable module

 drivers/pinctrl/mediatek/Kconfig                 | 13 ++++++++++---
 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         |  6 ++++++
 6 files changed, 56 insertions(+), 5 deletions(-)

-- 
1.8.1.1.dirty