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PIN_CONFIG_INPUT_SCHMITT_ENABLE is one such option. Fix the readback of the option in the mediatek-paris library, so that the debugfs dump is not showing "input schmitt enabled" for pins that don't have it enabled. Fixes: 1bea6afbc842 ("pinctrl: mediatek: Refine mtk_pinconf_get()") Signed-off-by: Chen-Yu Tsai Reviewed-by: AngeloGioacchino Del Regno --- drivers/pinctrl/mediatek/pinctrl-paris.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/pinctrl/mediatek/pinctrl-paris.c b/drivers/pinctrl/med= iatek/pinctrl-paris.c index b6bc31abd2b0..9353f78a52f0 100644 --- a/drivers/pinctrl/mediatek/pinctrl-paris.c +++ b/drivers/pinctrl/mediatek/pinctrl-paris.c @@ -193,6 +193,8 @@ static int mtk_pinconf_get(struct pinctrl_dev *pctldev, } =20 err =3D mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_SMT, &ret); + if (!ret) + err =3D -EINVAL; break; case PIN_CONFIG_DRIVE_STRENGTH: if (!hw->soc->drive_get) --=20 2.44.0.396.g6e790dbe36-goog From nobody Fri Sep 20 01:45:51 2024 Received: from mail-oi1-f176.google.com (mail-oi1-f176.google.com [209.85.167.176]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 09CAC381BD for ; 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Wed, 27 Mar 2024 02:13:45 -0700 (PDT) Received: from wenstp920.tpe.corp.google.com ([2401:fa00:1:10:74c2:3606:170b:52f3]) by smtp.gmail.com with ESMTPSA id fa31-20020a056a002d1f00b006e69cb93585sm7342911pfb.83.2024.03.27.02.13.43 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 27 Mar 2024 02:13:44 -0700 (PDT) From: Chen-Yu Tsai To: Sean Wang , Linus Walleij , Matthias Brugger , AngeloGioacchino Del Regno Cc: Chen-Yu Tsai , linux-mediatek@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 2/2] pinctrl: mediatek: paris: Rework support for PIN_CONFIG_{INPUT,OUTPUT}_ENABLE Date: Wed, 27 Mar 2024 17:13:34 +0800 Message-ID: <20240327091336.3434141-3-wenst@chromium.org> X-Mailer: git-send-email 2.44.0.396.g6e790dbe36-goog In-Reply-To: <20240327091336.3434141-1-wenst@chromium.org> References: <20240327091336.3434141-1-wenst@chromium.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" There is a misinterpretation of some of the PIN_CONFIG_* options in this driver library. PIN_CONFIG_OUTPUT_ENABLE should refer to a buffer or switch in the output direction of the electrical path. The MediaTek hardware does not have such a thing. The driver incorrectly maps this option to the GPIO function's direction. Likewise, PIN_CONFIG_INPUT_ENABLE should refer to a buffer or switch in the input direction. The hardware does have such a mechanism, and is mapped to the IES bit. The driver however sets the direction in addition to the IES bit, which is incorrect. On readback, the IES bit isn't even considered. Ironically, the driver does not support readback for PIN_CONFIG_OUTPUT, while its readback of PIN_CONFIG_{INPUT,OUTPUT}_ENABLE is what it should be doing for PIN_CONFIG_OUTPUT. Rework support for these three options, so that PIN_CONFIG_OUTPUT_ENABLE is completely removed, PIN_CONFIG_INPUT_ENABLE is only linked to the IES bit, and PIN_CONFIG_OUTPUT is linked to the GPIO function's direction and output level. Fixes: 805250982bb5 ("pinctrl: mediatek: add pinctrl-paris that implements = the vendor dt-bindings") Signed-off-by: Chen-Yu Tsai Reviewed-by: AngeloGioacchino Del Regno --- drivers/pinctrl/mediatek/pinctrl-paris.c | 38 +++++++----------------- 1 file changed, 11 insertions(+), 27 deletions(-) diff --git a/drivers/pinctrl/mediatek/pinctrl-paris.c b/drivers/pinctrl/med= iatek/pinctrl-paris.c index 9353f78a52f0..b19bc391705e 100644 --- a/drivers/pinctrl/mediatek/pinctrl-paris.c +++ b/drivers/pinctrl/mediatek/pinctrl-paris.c @@ -165,20 +165,21 @@ static int mtk_pinconf_get(struct pinctrl_dev *pctlde= v, err =3D mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_SR, &ret); break; case PIN_CONFIG_INPUT_ENABLE: - case PIN_CONFIG_OUTPUT_ENABLE: + err =3D mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_IES, &ret); + if (!ret) + err =3D -EINVAL; + break; + case PIN_CONFIG_OUTPUT: err =3D mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_DIR, &ret); if (err) break; - /* CONFIG Current direction return value - * ------------- ----------------- ---------------------- - * OUTPUT_ENABLE output 1 (=3D HW value) - * input 0 (=3D HW value) - * INPUT_ENABLE output 0 (=3D reverse HW value) - * input 1 (=3D reverse HW value) - */ - if (param =3D=3D PIN_CONFIG_INPUT_ENABLE) - ret =3D !ret; =20 + if (!ret) { + err =3D -EINVAL; + break; + } + + err =3D mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_DO, &ret); break; case PIN_CONFIG_INPUT_SCHMITT_ENABLE: err =3D mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_DIR, &ret); @@ -283,26 +284,9 @@ static int mtk_pinconf_set(struct pinctrl_dev *pctldev= , unsigned int pin, break; err =3D hw->soc->bias_set_combo(hw, desc, 0, arg); break; - case PIN_CONFIG_OUTPUT_ENABLE: - err =3D mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_SMT, - MTK_DISABLE); - /* Keep set direction to consider the case that a GPIO pin - * does not have SMT control - */ - if (err !=3D -ENOTSUPP) - break; - - err =3D mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_DIR, - MTK_OUTPUT); - break; case PIN_CONFIG_INPUT_ENABLE: /* regard all non-zero value as enable */ err =3D mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_IES, !!arg); - if (err) - break; - - err =3D mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_DIR, - MTK_INPUT); break; case PIN_CONFIG_SLEW_RATE: /* regard all non-zero value as enable */ --=20 2.44.0.396.g6e790dbe36-goog