linux-kernel - [PATCH v2] pinctrl: msm: Add sleep pinctrl state transitions

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Date:   Fri, 16 Nov 2018 10:58:53 -0800
From:   Evan Green <evgreen@...omium.org>
To:     Linus Walleij <linus.walleij@...aro.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     Stephen Boyd <swboyd@...omium.org>,
        Evan Green <evgreen@...omium.org>, linux-gpio@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org
Subject: [PATCH v2] pinctrl: msm: Add sleep pinctrl state transitions

Add PM suspend callbacks to the msm core driver that select the
sleep and default pinctrl states. Then wire those callbacks up
in the sdm845 driver, for those boards that may have GPIO hogs
that need to change state during suspend.

Signed-off-by: Evan Green <evgreen@...omium.org>
Reviewed-by: Stephen Boyd <swboyd@...omium.org>
---

Changes in v2:
 - Moved dev_pm_ops structure to pinctrl-msm [Bjorn]

 drivers/pinctrl/qcom/pinctrl-msm.c    | 19 +++++++++++++++++++
 drivers/pinctrl/qcom/pinctrl-msm.h    |  2 ++
 drivers/pinctrl/qcom/pinctrl-sdm845.c |  1 +
 3 files changed, 22 insertions(+)

diff --git a/drivers/pinctrl/qcom/pinctrl-msm.c b/drivers/pinctrl/qcom/pinctrl-msm.c
index 7c7d083e2c0dc..87cbebe217fd2 100644
--- a/drivers/pinctrl/qcom/pinctrl-msm.c
+++ b/drivers/pinctrl/qcom/pinctrl-msm.c
@@ -1072,6 +1072,25 @@ static void msm_pinctrl_setup_pm_reset(struct msm_pinctrl *pctrl)
 		}
 }
 
+static int msm_pinctrl_suspend(struct device *dev)
+{
+	struct msm_pinctrl *pctrl = dev_get_drvdata(dev);
+
+	return pinctrl_force_sleep(pctrl->pctrl);
+}
+
+static int msm_pinctrl_resume(struct device *dev)
+{
+	struct msm_pinctrl *pctrl = dev_get_drvdata(dev);
+
+	return pinctrl_force_default(pctrl->pctrl);
+}
+
+SIMPLE_DEV_PM_OPS(msm_pinctrl_dev_pm_ops, msm_pinctrl_suspend,
+		  msm_pinctrl_resume);
+
+EXPORT_SYMBOL(msm_pinctrl_dev_pm_ops);
+
 int msm_pinctrl_probe(struct platform_device *pdev,
 		      const struct msm_pinctrl_soc_data *soc_data)
 {
diff --git a/drivers/pinctrl/qcom/pinctrl-msm.h b/drivers/pinctrl/qcom/pinctrl-msm.h
index 29172fdf5882c..c12048e54a6f0 100644
--- a/drivers/pinctrl/qcom/pinctrl-msm.h
+++ b/drivers/pinctrl/qcom/pinctrl-msm.h
@@ -123,6 +123,8 @@ struct msm_pinctrl_soc_data {
 	unsigned int ntiles;
 };
 
+extern const struct dev_pm_ops msm_pinctrl_dev_pm_ops;
+
 int msm_pinctrl_probe(struct platform_device *pdev,
 		      const struct msm_pinctrl_soc_data *soc_data);
 int msm_pinctrl_remove(struct platform_device *pdev);
diff --git a/drivers/pinctrl/qcom/pinctrl-sdm845.c b/drivers/pinctrl/qcom/pinctrl-sdm845.c
index 2ab7a88857579..c97f20fca5fd3 100644
--- a/drivers/pinctrl/qcom/pinctrl-sdm845.c
+++ b/drivers/pinctrl/qcom/pinctrl-sdm845.c
@@ -1300,6 +1300,7 @@ static const struct of_device_id sdm845_pinctrl_of_match[] = {
 static struct platform_driver sdm845_pinctrl_driver = {
 	.driver = {
 		.name = "sdm845-pinctrl",
+		.pm = &msm_pinctrl_dev_pm_ops,
 		.of_match_table = sdm845_pinctrl_of_match,
 	},
 	.probe = sdm845_pinctrl_probe,
-- 
2.16.4