linux-kernel - [PATCH 2/2] spi: atmel: add PM support to SAMA5D2

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Message-Id: <20170412070520.29621-2-quentin.schulz@free-electrons.com>
Date:   Wed, 12 Apr 2017 09:05:20 +0200
From:   Quentin Schulz <quentin.schulz@...e-electrons.com>
To:     nicolas.ferre@...rochip.com, broonie@...nel.org
Cc:     Quentin Schulz <quentin.schulz@...e-electrons.com>,
        linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org,
        alexandre.belloni@...e-electrons.com,
        thomas.petazzoni@...e-electrons.com
Subject: [PATCH 2/2] spi: atmel: add PM support to SAMA5D2

This adds PM support to the ATMEL SAMA5D2 Xplained.

When suspending, VDDCore is shut down and the SPI registers are lost.
Thus, the SPI controller needs to be re-initialized after resuming from
a system suspend.

Signed-off-by: Quentin Schulz <quentin.schulz@...e-electrons.com>
---
 drivers/spi/spi-atmel.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/spi/spi-atmel.c b/drivers/spi/spi-atmel.c
index 247d920..1eb83c9 100644
--- a/drivers/spi/spi-atmel.c
+++ b/drivers/spi/spi-atmel.c
@@ -1702,8 +1702,17 @@ static int atmel_spi_suspend(struct device *dev)
 static int atmel_spi_resume(struct device *dev)
 {
 	struct spi_master *master = dev_get_drvdata(dev);
+	struct atmel_spi *as = spi_master_get_devdata(master);
 	int ret;
 
+	ret = clk_prepare_enable(as->clk);
+	if (ret)
+		return ret;
+
+	atmel_spi_init(as);
+
+	clk_disable_unprepare(as->clk);
+
 	if (!pm_runtime_suspended(dev)) {
 		ret = atmel_spi_runtime_resume(dev);
 		if (ret)
-- 
2.9.3