linux-kernel - [PATCH 05/14] spi: spi-qcom-qspi: Support pinctrl sleep states

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Message-Id: <20230323102605.5.I79544b9486033bd7b27f2be55adda6d36f62a366@changeid>
Date:   Thu, 23 Mar 2023 10:30:09 -0700
From:   Douglas Anderson <dianders@...omium.org>
To:     Bjorn Andersson <andersson@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Mark Brown <broonie@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>
Cc:     Matthias Kaehlcke <mka@...omium.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        linux-gpio@...r.kernel.org, Stephen Boyd <swboyd@...omium.org>,
        devicetree@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-spi@...r.kernel.org,
        Douglas Anderson <dianders@...omium.org>,
        Andy Gross <agross@...nel.org>, linux-kernel@...r.kernel.org
Subject: [PATCH 05/14] spi: spi-qcom-qspi: Support pinctrl sleep states

It's fairly common practice for drivers to switch to a "sleep" pinctrl
state at the end of its runtime_suspend function and then back to
"default" at the beginning of runtime_resume. Let's do that for
spi-qcom-qspi.

Signed-off-by: Douglas Anderson <dianders@...omium.org>
---

 drivers/spi/spi-qcom-qspi.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/spi/spi-qcom-qspi.c b/drivers/spi/spi-qcom-qspi.c
index c334dfec4117..7851cf1986cc 100644
--- a/drivers/spi/spi-qcom-qspi.c
+++ b/drivers/spi/spi-qcom-qspi.c
@@ -8,6 +8,7 @@
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/of_platform.h>
+#include <linux/pinctrl/consumer.h>
 #include <linux/pm_runtime.h>
 #include <linux/pm_opp.h>
 #include <linux/spi/spi.h>
@@ -581,6 +582,8 @@ static int __maybe_unused qcom_qspi_runtime_suspend(struct device *dev)
 		return ret;
 	}
 
+	pinctrl_pm_select_sleep_state(dev);
+
 	return 0;
 }
 
@@ -590,6 +593,8 @@ static int __maybe_unused qcom_qspi_runtime_resume(struct device *dev)
 	struct qcom_qspi *ctrl = spi_master_get_devdata(master);
 	int ret;
 
+	pinctrl_pm_select_default_state(dev);
+
 	ret = icc_enable(ctrl->icc_path_cpu_to_qspi);
 	if (ret) {
 		dev_err_ratelimited(ctrl->dev, "%s: ICC enable failed for cpu: %d\n",
-- 
2.40.0.348.gf938b09366-goog