[PATCH 6.18.y 1/3] spi: atmel-quadspi: add controller init callback

[Sasha Levin <sashal@kernel.org>]

From: Robert Marko <robert.marko@sartura.hr>

[ Upstream commit cbbd5a945e85e7835ac5792d855d85c20e40d1e3 ]

Allow controller variants to provide a custom initialization callback
through their capability data.

This prepares the driver for variants which require a different hardware
initialization sequence without adding SoC checks to the common path.

Signed-off-by: Robert Marko <robert.marko@sartura.hr>
Link: https://patch.msgid.link/20260709112006.390742-3-robert.marko@sartura.hr
Signed-off-by: Mark Brown <broonie@kernel.org>
Stable-dep-of: 717e45f97246 ("spi: atmel-quadspi: balance runtime PM and pclk across system sleep")
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/spi/atmel-quadspi.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/spi/atmel-quadspi.c b/drivers/spi/atmel-quadspi.c
index d7a3d85d00c2f..6c2d3c00409bb 100644
--- a/drivers/spi/atmel-quadspi.c
+++ b/drivers/spi/atmel-quadspi.c
@@ -256,8 +256,11 @@ static const struct atmel_qspi_pcal pcal[ATMEL_QSPI_PCAL_ARRAY_SIZE] = {
 	{200000000, 7},
 };
 
+struct atmel_qspi;
+
 struct atmel_qspi_caps {
 	u32 max_speed_hz;
+	int (*init)(struct atmel_qspi *aq);
 	bool has_qspick;
 	bool has_gclk;
 	bool has_ricr;
@@ -1156,6 +1159,9 @@ static int atmel_qspi_sama7g5_setup(struct spi_device *spi)
 	/* The controller can communicate with a single peripheral device (target). */
 	aq->target_max_speed_hz = spi->max_speed_hz;
 
+	if (aq->caps->init)
+		return aq->caps->init(aq);
+
 	return atmel_qspi_sama7g5_init(aq);
 }
 
@@ -1571,6 +1577,9 @@ static int __maybe_unused atmel_qspi_resume(struct device *dev)
 		return ret;
 	}
 
+	if (aq->caps->init)
+		return aq->caps->init(aq);
+
 	if (aq->caps->has_gclk)
 		return atmel_qspi_sama7g5_init(aq);
 
-- 
2.53.0