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From:   Mars Cheng <mars.cheng@mediatek.com>
To:     Matthias Brugger <matthias.bgg@gmail.com>,
        Rob Herring <robh@kernel.org>,
        Marc Zyngier <marc.zyngier@arm.com>,
        Stephen Boyd <sboyd@kernel.org>,
        Sean Wang <sean.wang@kernel.org>,
        Linus Walleij <linus.walleij@linaro.org>
CC:     CC Hwang <cc.hwang@mediatek.com>,
        Loda Chou <loda.chou@mediatek.com>,
        <linux-kernel@vger.kernel.org>,
        <linux-mediatek@lists.infradead.org>, <devicetree@vger.kernel.org>,
        <wsd_upstream@mediatek.com>, mtk01761 <wendell.lin@mediatek.com>,
        <linux-clk@vger.kernel.org>, Mars Cheng <mars.cheng@mediatek.com>
Subject: [PATCH v2 05/11] pinctrl: mediatek: avoid virtual gpio trying to set reg
Date:   Mon, 19 Aug 2019 17:21:36 +0800
Message-ID: <1566206502-4347-6-git-send-email-mars.cheng@mediatek.com>
In-Reply-To: <1566206502-4347-1-git-send-email-mars.cheng@mediatek.com>
References: <1566206502-4347-1-git-send-email-mars.cheng@mediatek.com>
MIME-Version: 1.0
Content-Type: text/plain
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

for virtual gpios, they should not do reg setting and
should behave as expected for eint function.

Signed-off-by: Mars Cheng <mars.cheng@mediatek.com>
---
 drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c |   20 ++++++++++++++++++++
 drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.h |    1 +
 drivers/pinctrl/mediatek/pinctrl-paris.c         |    3 +++
 3 files changed, 24 insertions(+)

diff --git a/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c b/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c
index 20e1c89..04948a6 100644
--- a/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c
+++ b/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c
@@ -226,6 +226,23 @@ static int mtk_xt_find_eint_num(struct mtk_pinctrl *hw, unsigned long eint_n)
 	return EINT_NA;
 }
 
+bool mtk_is_virt_gpio(struct mtk_pinctrl *hw, unsigned int gpio_n)
+{
+	const struct mtk_pin_desc *desc;
+	bool virt_gpio = false;
+
+	if (gpio_n >= hw->soc->npins)
+		return virt_gpio;
+
+	desc = (const struct mtk_pin_desc *)&hw->soc->pins[gpio_n];
+
+	if (desc->funcs &&
+	    desc->funcs[desc->eint.eint_m].name == 0)
+		virt_gpio = true;
+
+	return virt_gpio;
+}
+
 static int mtk_xt_get_gpio_n(void *data, unsigned long eint_n,
 			     unsigned int *gpio_n,
 			     struct gpio_chip **gpio_chip)
@@ -278,6 +295,9 @@ static int mtk_xt_set_gpio_as_eint(void *data, unsigned long eint_n)
 	if (err)
 		return err;
 
+	if (mtk_is_virt_gpio(hw, gpio_n))
+		return 0;
+
 	desc = (const struct mtk_pin_desc *)&hw->soc->pins[gpio_n];
 
 	err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_MODE,
diff --git a/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.h b/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.h
index 1b7da42..cda1c7a0 100644
--- a/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.h
+++ b/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.h
@@ -299,4 +299,5 @@ int mtk_pinconf_adv_drive_set(struct mtk_pinctrl *hw,
 int mtk_pinconf_adv_drive_get(struct mtk_pinctrl *hw,
 			      const struct mtk_pin_desc *desc, u32 *val);
 
+bool mtk_is_virt_gpio(struct mtk_pinctrl *hw, unsigned int gpio_n);
 #endif /* __PINCTRL_MTK_COMMON_V2_H */
diff --git a/drivers/pinctrl/mediatek/pinctrl-paris.c b/drivers/pinctrl/mediatek/pinctrl-paris.c
index 923264d..ef479ea 100644
--- a/drivers/pinctrl/mediatek/pinctrl-paris.c
+++ b/drivers/pinctrl/mediatek/pinctrl-paris.c
@@ -693,6 +693,9 @@ static int mtk_gpio_get_direction(struct gpio_chip *chip, unsigned int gpio)
 	const struct mtk_pin_desc *desc;
 	int value, err;
 
+	if (mtk_is_virt_gpio(hw, gpio))
+		return 1;
+
 	desc = (const struct mtk_pin_desc *)&hw->soc->pins[gpio];
 
 	err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_DIR, &value);
-- 
1.7.9.5