linux-kernel - [PATCH 3/4] pinctrl: qcom: add support for i2c specific pull feature

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Message-Id: <20221116105724.2600349-4-abel.vesa@linaro.org>
Date:   Wed, 16 Nov 2022 12:57:23 +0200
From:   Abel Vesa <abel.vesa@...aro.org>
To:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        devicetree@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        Neil Armstrong <neil.armstrong@...aro.org>
Subject: [PATCH 3/4] pinctrl: qcom: add support for i2c specific pull feature

From: Neil Armstrong <neil.armstrong@...aro.org>

Add support for the new i2c_pull property introduced for SM8550 setting
a I2C specific pull mode on I2C able pins.

Signed-off-by: Neil Armstrong <neil.armstrong@...aro.org>
---
 drivers/pinctrl/qcom/pinctrl-msm.c | 20 ++++++++++++++++++++
 drivers/pinctrl/qcom/pinctrl-msm.h |  1 +
 2 files changed, 21 insertions(+)

diff --git a/drivers/pinctrl/qcom/pinctrl-msm.c b/drivers/pinctrl/qcom/pinctrl-msm.c
index 8fbb953c4bbe..f92082c1c805 100644
--- a/drivers/pinctrl/qcom/pinctrl-msm.c
+++ b/drivers/pinctrl/qcom/pinctrl-msm.c
@@ -83,6 +83,12 @@ struct msm_pinctrl {
 	u32 phys_base[MAX_NR_TILES];
 };
 
+#define PIN_CONFIG_QCOM_I2C_PULL	(PIN_CONFIG_END + 1)
+
+static const struct pinconf_generic_params msm_pinconf_custom_bindings[] = {
+	{"qcom,i2c-pull", PIN_CONFIG_END + 1, 0},
+};
+
 #define MSM_ACCESSOR(name) \
 static u32 msm_readl_##name(struct msm_pinctrl *pctrl, \
 			    const struct msm_pingroup *g) \
@@ -324,6 +330,12 @@ static int msm_config_reg(struct msm_pinctrl *pctrl,
 		*bit = g->oe_bit;
 		*mask = 1;
 		break;
+	case PIN_CONFIG_QCOM_I2C_PULL:
+		if (g->i2c_pull_bit == 0)
+			return -EOPNOTSUPP;
+		*bit = g->i2c_pull_bit;
+		*mask = 1;
+		break;
 	default:
 		return -ENOTSUPP;
 	}
@@ -415,6 +427,9 @@ static int msm_config_group_get(struct pinctrl_dev *pctldev,
 			return -EINVAL;
 		arg = 1;
 		break;
+	case PIN_CONFIG_QCOM_I2C_PULL:
+		arg = 1;
+		break;
 	default:
 		return -ENOTSUPP;
 	}
@@ -498,6 +513,9 @@ static int msm_config_group_set(struct pinctrl_dev *pctldev,
 			/* disable output */
 			arg = 0;
 			break;
+		case PIN_CONFIG_QCOM_I2C_PULL:
+			arg = 1;
+			break;
 		default:
 			dev_err(pctrl->dev, "Unsupported config parameter: %x\n",
 				param);
@@ -1495,6 +1513,8 @@ int msm_pinctrl_probe(struct platform_device *pdev,
 	pctrl->desc.name = dev_name(&pdev->dev);
 	pctrl->desc.pins = pctrl->soc->pins;
 	pctrl->desc.npins = pctrl->soc->npins;
+	pctrl->desc.custom_params = msm_pinconf_custom_bindings;
+	pctrl->desc.num_custom_params = ARRAY_SIZE(msm_pinconf_custom_bindings);
 
 	pctrl->pctrl = devm_pinctrl_register(&pdev->dev, &pctrl->desc, pctrl);
 	if (IS_ERR(pctrl->pctrl)) {
diff --git a/drivers/pinctrl/qcom/pinctrl-msm.h b/drivers/pinctrl/qcom/pinctrl-msm.h
index 05a1209bf9ae..985eceda2517 100644
--- a/drivers/pinctrl/qcom/pinctrl-msm.h
+++ b/drivers/pinctrl/qcom/pinctrl-msm.h
@@ -80,6 +80,7 @@ struct msm_pingroup {
 
 	unsigned pull_bit:5;
 	unsigned drv_bit:5;
+	unsigned i2c_pull_bit:5;
 
 	unsigned od_bit:5;
 	unsigned egpio_enable:5;
-- 
2.34.1