linux-kernel - [PATCH] spi: spi-mt65xx: Support sleep pin control

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Date: Mon,  8 Jan 2024 20:08:02 +0800
From: Ruihai Zhou <zhouruihai@...qin.corp-partner.google.com>
To: broonie@...nel.org,
	matthias.bgg@...il.com,
	angelogioacchino.delregno@...labora.com
Cc: linux-spi@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org,
	wenst@...omium.org,
	Ruihai Zhou <zhouruihai@...qin.corp-partner.google.com>
Subject: [PATCH] spi: spi-mt65xx: Support sleep pin control

Supports configuring sleep pin control during system suspend to prevent
potential power leakage and additional power consumption.

Signed-off-by: Ruihai Zhou <zhouruihai@...qin.corp-partner.google.com>
---
 drivers/spi/spi-mt65xx.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/spi/spi-mt65xx.c b/drivers/spi/spi-mt65xx.c
index 8d5d170d49cc..8d4633b353ee 100644
--- a/drivers/spi/spi-mt65xx.c
+++ b/drivers/spi/spi-mt65xx.c
@@ -13,6 +13,7 @@
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/gpio/consumer.h>
+#include <linux/pinctrl/consumer.h>
 #include <linux/platform_device.h>
 #include <linux/platform_data/spi-mt65xx.h>
 #include <linux/pm_runtime.h>
@@ -1316,6 +1317,8 @@ static int mtk_spi_suspend(struct device *dev)
 		clk_disable_unprepare(mdata->spi_hclk);
 	}
 
+	pinctrl_pm_select_sleep_state(dev);
+
 	return 0;
 }
 
@@ -1325,6 +1328,8 @@ static int mtk_spi_resume(struct device *dev)
 	struct spi_controller *host = dev_get_drvdata(dev);
 	struct mtk_spi *mdata = spi_controller_get_devdata(host);
 
+	pinctrl_pm_select_default_state(dev);
+
 	if (!pm_runtime_suspended(dev)) {
 		ret = clk_prepare_enable(mdata->spi_clk);
 		if (ret < 0) {
-- 
2.17.1