linux-kernel - [PATCH] memory: renesas-rpc-if: Add suspend/resume support

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Message-ID: <20250921111855.103566-1-biju.das.jz@bp.renesas.com>
Date: Sun, 21 Sep 2025 12:18:52 +0100
From: Biju Das <biju.das.jz@...renesas.com>
To: Krzysztof Kozlowski <krzk@...nel.org>
Cc: Biju Das <biju.das.jz@...renesas.com>,
	linux-kernel@...r.kernel.org,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	Prabhakar Mahadev Lad <prabhakar.mahadev-lad.rj@...renesas.com>,
	Biju Das <biju.das.au@...il.com>,
	linux-renesas-soc@...r.kernel.org
Subject: [PATCH] memory: renesas-rpc-if: Add suspend/resume support

On RZ/G3E using PSCI, s2ram powers down the SoC. Add suspend/resume
callbacks to control spi/spix2 clocks.

Signed-off-by: Biju Das <biju.das.jz@...renesas.com>
---
 drivers/memory/renesas-rpc-if.c | 56 ++++++++++++++++++++++++++++-----
 1 file changed, 48 insertions(+), 8 deletions(-)

diff --git a/drivers/memory/renesas-rpc-if.c b/drivers/memory/renesas-rpc-if.c
index 4a417b693080..e1fba157982f 100644
--- a/drivers/memory/renesas-rpc-if.c
+++ b/drivers/memory/renesas-rpc-if.c
@@ -67,6 +67,8 @@ struct rpcif_priv {
 	void __iomem *dirmap;
 	struct regmap *regmap;
 	struct reset_control *rstc;
+	struct clk *spi_clk;
+	struct clk *spix2_clk;
 	struct platform_device *vdev;
 	size_t size;
 	const struct rpcif_info *info;
@@ -1025,16 +1027,14 @@ static int rpcif_probe(struct platform_device *pdev)
 	 * disable it in remove().
 	 */
 	if (rpc->info->type == XSPI_RZ_G3E) {
-		struct clk *spi_clk;
-
-		spi_clk = devm_clk_get_enabled(dev, "spix2");
-		if (IS_ERR(spi_clk))
-			return dev_err_probe(dev, PTR_ERR(spi_clk),
+		rpc->spix2_clk = devm_clk_get_enabled(dev, "spix2");
+		if (IS_ERR(rpc->spix2_clk))
+			return dev_err_probe(dev, PTR_ERR(rpc->spix2_clk),
 					     "cannot get enabled spix2 clk\n");
 
-		spi_clk = devm_clk_get_enabled(dev, "spi");
-		if (IS_ERR(spi_clk))
-			return dev_err_probe(dev, PTR_ERR(spi_clk),
+		rpc->spi_clk = devm_clk_get_enabled(dev, "spi");
+		if (IS_ERR(rpc->spi_clk))
+			return dev_err_probe(dev, PTR_ERR(rpc->spi_clk),
 					     "cannot get enabled spi clk\n");
 	}
 
@@ -1063,6 +1063,43 @@ static void rpcif_remove(struct platform_device *pdev)
 	platform_device_unregister(rpc->vdev);
 }
 
+static int rpcif_suspend(struct device *dev)
+{
+	struct rpcif_priv *rpc = dev_get_drvdata(dev);
+
+	if (rpc->info->type == XSPI_RZ_G3E) {
+		clk_disable_unprepare(rpc->spi_clk);
+		clk_disable_unprepare(rpc->spix2_clk);
+	}
+
+	return 0;
+}
+
+static int rpcif_resume(struct device *dev)
+{
+	struct rpcif_priv *rpc = dev_get_drvdata(dev);
+
+	if (rpc->info->type == XSPI_RZ_G3E) {
+		int ret = clk_prepare_enable(rpc->spix2_clk);
+
+		if (ret) {
+			dev_err(dev, "failed to enable spi x2 clock: %pe\n",
+				ERR_PTR(ret));
+			return ret;
+		}
+
+		ret = clk_prepare_enable(rpc->spi_clk);
+		if (ret) {
+			clk_disable_unprepare(rpc->spix2_clk);
+			dev_err(dev, "failed to enable spi x2 clock: %pe\n",
+				ERR_PTR(ret));
+			return ret;
+		}
+	}
+
+	return 0;
+}
+
 static const struct rpcif_impl rpcif_impl = {
 	.hw_init = rpcif_hw_init_impl,
 	.prepare = rpcif_prepare_impl,
@@ -1125,12 +1162,15 @@ static const struct of_device_id rpcif_of_match[] = {
 };
 MODULE_DEVICE_TABLE(of, rpcif_of_match);
 
+static DEFINE_SIMPLE_DEV_PM_OPS(rpcif_pm_ops, rpcif_suspend, rpcif_resume);
+
 static struct platform_driver rpcif_driver = {
 	.probe	= rpcif_probe,
 	.remove = rpcif_remove,
 	.driver = {
 		.name =	"rpc-if",
 		.of_match_table = rpcif_of_match,
+		.pm = pm_sleep_ptr(&rpcif_pm_ops),
 	},
 };
 module_platform_driver(rpcif_driver);
-- 
2.43.0