linux-kernel - [PATCH 09/13] spi: rzv2h-rspi: split out PIO transfer

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Message-ID: <20251201134229.600817-10-cosmin-gabriel.tanislav.xa@renesas.com>
Date: Mon,  1 Dec 2025 15:42:25 +0200
From: Cosmin Tanislav <cosmin-gabriel.tanislav.xa@...esas.com>
To: Fabrizio Castro <fabrizio.castro.jz@...esas.com>,
	Mark Brown <broonie@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	Magnus Damm <magnus.damm@...il.com>,
	Philipp Zabel <p.zabel@...gutronix.de>
Cc: linux-spi@...r.kernel.org,
	linux-renesas-soc@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Cosmin Tanislav <cosmin-gabriel.tanislav.xa@...esas.com>
Subject: [PATCH 09/13] spi: rzv2h-rspi: split out PIO transfer

In preparation for implementing DMA support, split out the PIO transfer
code into its own function.

Signed-off-by: Cosmin Tanislav <cosmin-gabriel.tanislav.xa@...esas.com>
---
 drivers/spi/spi-rzv2h-rspi.c | 27 ++++++++++++++++++++-------
 1 file changed, 20 insertions(+), 7 deletions(-)

diff --git a/drivers/spi/spi-rzv2h-rspi.c b/drivers/spi/spi-rzv2h-rspi.c
index b31ef2f31f1b..9f5bc047b485 100644
--- a/drivers/spi/spi-rzv2h-rspi.c
+++ b/drivers/spi/spi-rzv2h-rspi.c
@@ -219,17 +219,14 @@ static int rzv2h_rspi_receive(struct rzv2h_rspi_priv *rspi, void *rxbuf,
 	return 0;
 }
 
-static int rzv2h_rspi_transfer_one(struct spi_controller *controller,
+static int rzv2h_rspi_transfer_pio(struct rzv2h_rspi_priv *rspi,
 				   struct spi_device *spi,
-				   struct spi_transfer *transfer)
+				   struct spi_transfer *transfer,
+				   unsigned int words_to_transfer)
 {
-	struct rzv2h_rspi_priv *rspi = spi_controller_get_devdata(controller);
-	unsigned int words_to_transfer, i;
+	unsigned int i;
 	int ret = 0;
 
-	transfer->effective_speed_hz = rspi->freq;
-	words_to_transfer = transfer->len / rspi->bytes_per_word;
-
 	for (i = 0; i < words_to_transfer; i++) {
 		rzv2h_rspi_clear_all_irqs(rspi);
 
@@ -240,6 +237,22 @@ static int rzv2h_rspi_transfer_one(struct spi_controller *controller,
 			break;
 	}
 
+	return ret;
+}
+
+static int rzv2h_rspi_transfer_one(struct spi_controller *controller,
+				   struct spi_device *spi,
+				   struct spi_transfer *transfer)
+{
+	struct rzv2h_rspi_priv *rspi = spi_controller_get_devdata(controller);
+	unsigned int words_to_transfer;
+	int ret;
+
+	transfer->effective_speed_hz = rspi->freq;
+	words_to_transfer = transfer->len / rspi->bytes_per_word;
+
+	ret = rzv2h_rspi_transfer_pio(rspi, spi, transfer, words_to_transfer);
+
 	rzv2h_rspi_clear_all_irqs(rspi);
 
 	return ret;
-- 
2.52.0