[PATCH 0/5] Add STM32F7 SPI support

[PATCH 0/5] Add STM32F7 SPI support

[Ben Wolsieffer]

This series adds support for SPI on STM32F7 processors. The STM32F7 SPI
peripheral is nearly identical to the STM32F4, with the only significant
differences being that it supports a wider range of word sizes, and the
addition of 32-bit transmit and receive FIFOs.

Ben Wolsieffer (5):
  spi: stm32: rename stm32f4_* to stm32fx_*
  spi: stm32: use callbacks for read_rx and write_tx
  dt-bindings: spi: add stm32f7-spi compatible
  spi: stm32: add STM32F7 support
  ARM: dts: stm32: add SPI support on STM32F746

 .../devicetree/bindings/spi/st,stm32-spi.yaml |   1 +
 arch/arm/boot/dts/st/stm32f746.dtsi           |  60 +++
 drivers/spi/spi-stm32.c                       | 455 ++++++++++++------
 3 files changed, 367 insertions(+), 149 deletions(-)

-- 
2.42.0

[PATCH 1/5] spi: stm32: rename stm32f4_* to stm32fx_*

[Ben Wolsieffer]

The STM32F4 and STM32F7 SPI peripherals are very similar, therefore
most of the driver can be shared between the two. In preparation for
adding support for the F7, change all functions and defines to use a
generic stm32fx prefix, except for code and registers that differ
between the two devices.

Signed-off-by: Ben Wolsieffer <ben.wolsieffer@hefring.com>
---
 drivers/spi/spi-stm32.c | 290 ++++++++++++++++++++--------------------
 1 file changed, 145 insertions(+), 145 deletions(-)

diff --git a/drivers/spi/spi-stm32.c b/drivers/spi/spi-stm32.c
index e6e3e4ea29f9..02d1409d7229 100644
--- a/drivers/spi/spi-stm32.c
+++ b/drivers/spi/spi-stm32.c
@@ -22,58 +22,58 @@
 
 #define DRIVER_NAME "spi_stm32"
 
-/* STM32F4 SPI registers */
-#define STM32F4_SPI_CR1			0x00
-#define STM32F4_SPI_CR2			0x04
-#define STM32F4_SPI_SR			0x08
-#define STM32F4_SPI_DR			0x0C
-#define STM32F4_SPI_I2SCFGR		0x1C
-
-/* STM32F4_SPI_CR1 bit fields */
-#define STM32F4_SPI_CR1_CPHA		BIT(0)
-#define STM32F4_SPI_CR1_CPOL		BIT(1)
-#define STM32F4_SPI_CR1_MSTR		BIT(2)
-#define STM32F4_SPI_CR1_BR_SHIFT	3
-#define STM32F4_SPI_CR1_BR		GENMASK(5, 3)
-#define STM32F4_SPI_CR1_SPE		BIT(6)
-#define STM32F4_SPI_CR1_LSBFRST		BIT(7)
-#define STM32F4_SPI_CR1_SSI		BIT(8)
-#define STM32F4_SPI_CR1_SSM		BIT(9)
-#define STM32F4_SPI_CR1_RXONLY		BIT(10)
+/* STM32F4/7 SPI registers */
+#define STM32FX_SPI_CR1			0x00
+#define STM32FX_SPI_CR2			0x04
+#define STM32FX_SPI_SR			0x08
+#define STM32FX_SPI_DR			0x0C
+#define STM32FX_SPI_I2SCFGR		0x1C
+
+/* STM32FX_SPI_CR1 bit fields */
+#define STM32FX_SPI_CR1_CPHA		BIT(0)
+#define STM32FX_SPI_CR1_CPOL		BIT(1)
+#define STM32FX_SPI_CR1_MSTR		BIT(2)
+#define STM32FX_SPI_CR1_BR_SHIFT	3
+#define STM32FX_SPI_CR1_BR		GENMASK(5, 3)
+#define STM32FX_SPI_CR1_SPE		BIT(6)
+#define STM32FX_SPI_CR1_LSBFRST		BIT(7)
+#define STM32FX_SPI_CR1_SSI		BIT(8)
+#define STM32FX_SPI_CR1_SSM		BIT(9)
+#define STM32FX_SPI_CR1_RXONLY		BIT(10)
 #define STM32F4_SPI_CR1_DFF		BIT(11)
-#define STM32F4_SPI_CR1_CRCNEXT		BIT(12)
-#define STM32F4_SPI_CR1_CRCEN		BIT(13)
-#define STM32F4_SPI_CR1_BIDIOE		BIT(14)
-#define STM32F4_SPI_CR1_BIDIMODE	BIT(15)
-#define STM32F4_SPI_CR1_BR_MIN		0
-#define STM32F4_SPI_CR1_BR_MAX		(GENMASK(5, 3) >> 3)
-
-/* STM32F4_SPI_CR2 bit fields */
-#define STM32F4_SPI_CR2_RXDMAEN		BIT(0)
-#define STM32F4_SPI_CR2_TXDMAEN		BIT(1)
-#define STM32F4_SPI_CR2_SSOE		BIT(2)
-#define STM32F4_SPI_CR2_FRF		BIT(4)
-#define STM32F4_SPI_CR2_ERRIE		BIT(5)
-#define STM32F4_SPI_CR2_RXNEIE		BIT(6)
-#define STM32F4_SPI_CR2_TXEIE		BIT(7)
-
-/* STM32F4_SPI_SR bit fields */
-#define STM32F4_SPI_SR_RXNE		BIT(0)
-#define STM32F4_SPI_SR_TXE		BIT(1)
-#define STM32F4_SPI_SR_CHSIDE		BIT(2)
-#define STM32F4_SPI_SR_UDR		BIT(3)
-#define STM32F4_SPI_SR_CRCERR		BIT(4)
-#define STM32F4_SPI_SR_MODF		BIT(5)
-#define STM32F4_SPI_SR_OVR		BIT(6)
-#define STM32F4_SPI_SR_BSY		BIT(7)
-#define STM32F4_SPI_SR_FRE		BIT(8)
-
-/* STM32F4_SPI_I2SCFGR bit fields */
-#define STM32F4_SPI_I2SCFGR_I2SMOD	BIT(11)
+#define STM32FX_SPI_CR1_CRCNEXT		BIT(12)
+#define STM32FX_SPI_CR1_CRCEN		BIT(13)
+#define STM32FX_SPI_CR1_BIDIOE		BIT(14)
+#define STM32FX_SPI_CR1_BIDIMODE	BIT(15)
+#define STM32FX_SPI_CR1_BR_MIN		0
+#define STM32FX_SPI_CR1_BR_MAX		(GENMASK(5, 3) >> 3)
+
+/* STM32FX_SPI_CR2 bit fields */
+#define STM32FX_SPI_CR2_RXDMAEN		BIT(0)
+#define STM32FX_SPI_CR2_TXDMAEN		BIT(1)
+#define STM32FX_SPI_CR2_SSOE		BIT(2)
+#define STM32FX_SPI_CR2_FRF		BIT(4)
+#define STM32FX_SPI_CR2_ERRIE		BIT(5)
+#define STM32FX_SPI_CR2_RXNEIE		BIT(6)
+#define STM32FX_SPI_CR2_TXEIE		BIT(7)
+
+/* STM32FX_SPI_SR bit fields */
+#define STM32FX_SPI_SR_RXNE		BIT(0)
+#define STM32FX_SPI_SR_TXE		BIT(1)
+#define STM32FX_SPI_SR_CHSIDE		BIT(2)
+#define STM32FX_SPI_SR_UDR		BIT(3)
+#define STM32FX_SPI_SR_CRCERR		BIT(4)
+#define STM32FX_SPI_SR_MODF		BIT(5)
+#define STM32FX_SPI_SR_OVR		BIT(6)
+#define STM32FX_SPI_SR_BSY		BIT(7)
+#define STM32FX_SPI_SR_FRE		BIT(8)
+
+/* STM32FX_SPI_I2SCFGR bit fields */
+#define STM32FX_SPI_I2SCFGR_I2SMOD	BIT(11)
 
 /* STM32F4 SPI Baud Rate min/max divisor */
-#define STM32F4_SPI_BR_DIV_MIN		(2 << STM32F4_SPI_CR1_BR_MIN)
-#define STM32F4_SPI_BR_DIV_MAX		(2 << STM32F4_SPI_CR1_BR_MAX)
+#define STM32FX_SPI_BR_DIV_MIN		(2 << STM32FX_SPI_CR1_BR_MIN)
+#define STM32FX_SPI_BR_DIV_MAX		(2 << STM32FX_SPI_CR1_BR_MAX)
 
 /* STM32H7 SPI registers */
 #define STM32H7_SPI_CR1			0x00
@@ -324,20 +324,20 @@ struct stm32_spi {
 	bool device_mode;
 };
 
-static const struct stm32_spi_regspec stm32f4_spi_regspec = {
-	.en = { STM32F4_SPI_CR1, STM32F4_SPI_CR1_SPE },
+static const struct stm32_spi_regspec stm32fx_spi_regspec = {
+	.en = { STM32FX_SPI_CR1, STM32FX_SPI_CR1_SPE },
 
-	.dma_rx_en = { STM32F4_SPI_CR2, STM32F4_SPI_CR2_RXDMAEN },
-	.dma_tx_en = { STM32F4_SPI_CR2, STM32F4_SPI_CR2_TXDMAEN },
+	.dma_rx_en = { STM32FX_SPI_CR2, STM32FX_SPI_CR2_RXDMAEN },
+	.dma_tx_en = { STM32FX_SPI_CR2, STM32FX_SPI_CR2_TXDMAEN },
 
-	.cpol = { STM32F4_SPI_CR1, STM32F4_SPI_CR1_CPOL },
-	.cpha = { STM32F4_SPI_CR1, STM32F4_SPI_CR1_CPHA },
-	.lsb_first = { STM32F4_SPI_CR1, STM32F4_SPI_CR1_LSBFRST },
+	.cpol = { STM32FX_SPI_CR1, STM32FX_SPI_CR1_CPOL },
+	.cpha = { STM32FX_SPI_CR1, STM32FX_SPI_CR1_CPHA },
+	.lsb_first = { STM32FX_SPI_CR1, STM32FX_SPI_CR1_LSBFRST },
 	.cs_high = {},
-	.br = { STM32F4_SPI_CR1, STM32F4_SPI_CR1_BR, STM32F4_SPI_CR1_BR_SHIFT },
+	.br = { STM32FX_SPI_CR1, STM32FX_SPI_CR1_BR, STM32FX_SPI_CR1_BR_SHIFT },
 
-	.rx = { STM32F4_SPI_DR },
-	.tx = { STM32F4_SPI_DR },
+	.rx = { STM32FX_SPI_DR },
+	.tx = { STM32FX_SPI_DR },
 };
 
 static const struct stm32_spi_regspec stm32h7_spi_regspec = {
@@ -502,19 +502,19 @@ static u32 stm32h7_spi_prepare_fthlv(struct stm32_spi *spi, u32 xfer_len)
  */
 static void stm32f4_spi_write_tx(struct stm32_spi *spi)
 {
-	if ((spi->tx_len > 0) && (readl_relaxed(spi->base + STM32F4_SPI_SR) &
-				  STM32F4_SPI_SR_TXE)) {
+	if ((spi->tx_len > 0) && (readl_relaxed(spi->base + STM32FX_SPI_SR) &
+				  STM32FX_SPI_SR_TXE)) {
 		u32 offs = spi->cur_xferlen - spi->tx_len;
 
 		if (spi->cur_bpw == 16) {
 			const u16 *tx_buf16 = (const u16 *)(spi->tx_buf + offs);
 
-			writew_relaxed(*tx_buf16, spi->base + STM32F4_SPI_DR);
+			writew_relaxed(*tx_buf16, spi->base + STM32FX_SPI_DR);
 			spi->tx_len -= sizeof(u16);
 		} else {
 			const u8 *tx_buf8 = (const u8 *)(spi->tx_buf + offs);
 
-			writeb_relaxed(*tx_buf8, spi->base + STM32F4_SPI_DR);
+			writeb_relaxed(*tx_buf8, spi->base + STM32FX_SPI_DR);
 			spi->tx_len -= sizeof(u8);
 		}
 	}
@@ -566,19 +566,19 @@ static void stm32h7_spi_write_txfifo(struct stm32_spi *spi)
  */
 static void stm32f4_spi_read_rx(struct stm32_spi *spi)
 {
-	if ((spi->rx_len > 0) && (readl_relaxed(spi->base + STM32F4_SPI_SR) &
-				  STM32F4_SPI_SR_RXNE)) {
+	if ((spi->rx_len > 0) && (readl_relaxed(spi->base + STM32FX_SPI_SR) &
+				  STM32FX_SPI_SR_RXNE)) {
 		u32 offs = spi->cur_xferlen - spi->rx_len;
 
 		if (spi->cur_bpw == 16) {
 			u16 *rx_buf16 = (u16 *)(spi->rx_buf + offs);
 
-			*rx_buf16 = readw_relaxed(spi->base + STM32F4_SPI_DR);
+			*rx_buf16 = readw_relaxed(spi->base + STM32FX_SPI_DR);
 			spi->rx_len -= sizeof(u16);
 		} else {
 			u8 *rx_buf8 = (u8 *)(spi->rx_buf + offs);
 
-			*rx_buf8 = readb_relaxed(spi->base + STM32F4_SPI_DR);
+			*rx_buf8 = readb_relaxed(spi->base + STM32FX_SPI_DR);
 			spi->rx_len -= sizeof(u8);
 		}
 	}
@@ -645,10 +645,10 @@ static void stm32_spi_enable(struct stm32_spi *spi)
 }
 
 /**
- * stm32f4_spi_disable - Disable SPI controller
+ * stm32fx_spi_disable - Disable SPI controller
  * @spi: pointer to the spi controller data structure
  */
-static void stm32f4_spi_disable(struct stm32_spi *spi)
+static void stm32fx_spi_disable(struct stm32_spi *spi)
 {
 	unsigned long flags;
 	u32 sr;
@@ -657,20 +657,20 @@ static void stm32f4_spi_disable(struct stm32_spi *spi)
 
 	spin_lock_irqsave(&spi->lock, flags);
 
-	if (!(readl_relaxed(spi->base + STM32F4_SPI_CR1) &
-	      STM32F4_SPI_CR1_SPE)) {
+	if (!(readl_relaxed(spi->base + STM32FX_SPI_CR1) &
+	      STM32FX_SPI_CR1_SPE)) {
 		spin_unlock_irqrestore(&spi->lock, flags);
 		return;
 	}
 
 	/* Disable interrupts */
-	stm32_spi_clr_bits(spi, STM32F4_SPI_CR2, STM32F4_SPI_CR2_TXEIE |
-						 STM32F4_SPI_CR2_RXNEIE |
-						 STM32F4_SPI_CR2_ERRIE);
+	stm32_spi_clr_bits(spi, STM32FX_SPI_CR2, STM32FX_SPI_CR2_TXEIE |
+						 STM32FX_SPI_CR2_RXNEIE |
+						 STM32FX_SPI_CR2_ERRIE);
 
 	/* Wait until BSY = 0 */
-	if (readl_relaxed_poll_timeout_atomic(spi->base + STM32F4_SPI_SR,
-					      sr, !(sr & STM32F4_SPI_SR_BSY),
+	if (readl_relaxed_poll_timeout_atomic(spi->base + STM32FX_SPI_SR,
+					      sr, !(sr & STM32FX_SPI_SR_BSY),
 					      10, 100000) < 0) {
 		dev_warn(spi->dev, "disabling condition timeout\n");
 	}
@@ -680,14 +680,14 @@ static void stm32f4_spi_disable(struct stm32_spi *spi)
 	if (spi->cur_usedma && spi->dma_rx)
 		dmaengine_terminate_async(spi->dma_rx);
 
-	stm32_spi_clr_bits(spi, STM32F4_SPI_CR1, STM32F4_SPI_CR1_SPE);
+	stm32_spi_clr_bits(spi, STM32FX_SPI_CR1, STM32FX_SPI_CR1_SPE);
 
-	stm32_spi_clr_bits(spi, STM32F4_SPI_CR2, STM32F4_SPI_CR2_TXDMAEN |
-						 STM32F4_SPI_CR2_RXDMAEN);
+	stm32_spi_clr_bits(spi, STM32FX_SPI_CR2, STM32FX_SPI_CR2_TXDMAEN |
+						 STM32FX_SPI_CR2_RXDMAEN);
 
 	/* Sequence to clear OVR flag */
-	readl_relaxed(spi->base + STM32F4_SPI_DR);
-	readl_relaxed(spi->base + STM32F4_SPI_SR);
+	readl_relaxed(spi->base + STM32FX_SPI_DR);
+	readl_relaxed(spi->base + STM32FX_SPI_SR);
 
 	spin_unlock_irqrestore(&spi->lock, flags);
 }
@@ -763,11 +763,11 @@ static bool stm32_spi_can_dma(struct spi_controller *ctrl,
 }
 
 /**
- * stm32f4_spi_irq_event - Interrupt handler for SPI controller events
+ * stm32fx_spi_irq_event - Interrupt handler for SPI controller events
  * @irq: interrupt line
  * @dev_id: SPI controller ctrl interface
  */
-static irqreturn_t stm32f4_spi_irq_event(int irq, void *dev_id)
+static irqreturn_t stm32fx_spi_irq_event(int irq, void *dev_id)
 {
 	struct spi_controller *ctrl = dev_id;
 	struct stm32_spi *spi = spi_controller_get_devdata(ctrl);
@@ -776,26 +776,26 @@ static irqreturn_t stm32f4_spi_irq_event(int irq, void *dev_id)
 
 	spin_lock(&spi->lock);
 
-	sr = readl_relaxed(spi->base + STM32F4_SPI_SR);
+	sr = readl_relaxed(spi->base + STM32FX_SPI_SR);
 	/*
 	 * BSY flag is not handled in interrupt but it is normal behavior when
 	 * this flag is set.
 	 */
-	sr &= ~STM32F4_SPI_SR_BSY;
+	sr &= ~STM32FX_SPI_SR_BSY;
 
 	if (!spi->cur_usedma && (spi->cur_comm == SPI_SIMPLEX_TX ||
 				 spi->cur_comm == SPI_3WIRE_TX)) {
 		/* OVR flag shouldn't be handled for TX only mode */
-		sr &= ~(STM32F4_SPI_SR_OVR | STM32F4_SPI_SR_RXNE);
-		mask |= STM32F4_SPI_SR_TXE;
+		sr &= ~(STM32FX_SPI_SR_OVR | STM32FX_SPI_SR_RXNE);
+		mask |= STM32FX_SPI_SR_TXE;
 	}
 
 	if (!spi->cur_usedma && (spi->cur_comm == SPI_FULL_DUPLEX ||
 				spi->cur_comm == SPI_SIMPLEX_RX ||
 				spi->cur_comm == SPI_3WIRE_RX)) {
 		/* TXE flag is set and is handled when RXNE flag occurs */
-		sr &= ~STM32F4_SPI_SR_TXE;
-		mask |= STM32F4_SPI_SR_RXNE | STM32F4_SPI_SR_OVR;
+		sr &= ~STM32FX_SPI_SR_TXE;
+		mask |= STM32FX_SPI_SR_RXNE | STM32FX_SPI_SR_OVR;
 	}
 
 	if (!(sr & mask)) {
@@ -804,12 +804,12 @@ static irqreturn_t stm32f4_spi_irq_event(int irq, void *dev_id)
 		return IRQ_NONE;
 	}
 
-	if (sr & STM32F4_SPI_SR_OVR) {
+	if (sr & STM32FX_SPI_SR_OVR) {
 		dev_warn(spi->dev, "Overrun: received value discarded\n");
 
 		/* Sequence to clear OVR flag */
-		readl_relaxed(spi->base + STM32F4_SPI_DR);
-		readl_relaxed(spi->base + STM32F4_SPI_SR);
+		readl_relaxed(spi->base + STM32FX_SPI_DR);
+		readl_relaxed(spi->base + STM32FX_SPI_SR);
 
 		/*
 		 * If overrun is detected, it means that something went wrong,
@@ -820,14 +820,14 @@ static irqreturn_t stm32f4_spi_irq_event(int irq, void *dev_id)
 		goto end_irq;
 	}
 
-	if (sr & STM32F4_SPI_SR_TXE) {
+	if (sr & STM32FX_SPI_SR_TXE) {
 		if (spi->tx_buf)
 			stm32f4_spi_write_tx(spi);
 		if (spi->tx_len == 0)
 			end = true;
 	}
 
-	if (sr & STM32F4_SPI_SR_RXNE) {
+	if (sr & STM32FX_SPI_SR_RXNE) {
 		stm32f4_spi_read_rx(spi);
 		if (spi->rx_len == 0)
 			end = true;
@@ -838,10 +838,10 @@ static irqreturn_t stm32f4_spi_irq_event(int irq, void *dev_id)
 end_irq:
 	if (end) {
 		/* Immediately disable interrupts to do not generate new one */
-		stm32_spi_clr_bits(spi, STM32F4_SPI_CR2,
-					STM32F4_SPI_CR2_TXEIE |
-					STM32F4_SPI_CR2_RXNEIE |
-					STM32F4_SPI_CR2_ERRIE);
+		stm32_spi_clr_bits(spi, STM32FX_SPI_CR2,
+					STM32FX_SPI_CR2_TXEIE |
+					STM32FX_SPI_CR2_RXNEIE |
+					STM32FX_SPI_CR2_ERRIE);
 		spin_unlock(&spi->lock);
 		return IRQ_WAKE_THREAD;
 	}
@@ -851,17 +851,17 @@ static irqreturn_t stm32f4_spi_irq_event(int irq, void *dev_id)
 }
 
 /**
- * stm32f4_spi_irq_thread - Thread of interrupt handler for SPI controller
+ * stm32fx_spi_irq_thread - Thread of interrupt handler for SPI controller
  * @irq: interrupt line
  * @dev_id: SPI controller interface
  */
-static irqreturn_t stm32f4_spi_irq_thread(int irq, void *dev_id)
+static irqreturn_t stm32fx_spi_irq_thread(int irq, void *dev_id)
 {
 	struct spi_controller *ctrl = dev_id;
 	struct stm32_spi *spi = spi_controller_get_devdata(ctrl);
 
 	spi_finalize_current_transfer(ctrl);
-	stm32f4_spi_disable(spi);
+	stm32fx_spi_disable(spi);
 
 	return IRQ_HANDLED;
 }
@@ -1034,18 +1034,18 @@ static int stm32_spi_prepare_msg(struct spi_controller *ctrl,
 }
 
 /**
- * stm32f4_spi_dma_tx_cb - dma callback
+ * stm32fx_spi_dma_tx_cb - dma callback
  * @data: pointer to the spi controller data structure
  *
  * DMA callback is called when the transfer is complete for DMA TX channel.
  */
-static void stm32f4_spi_dma_tx_cb(void *data)
+static void stm32fx_spi_dma_tx_cb(void *data)
 {
 	struct stm32_spi *spi = data;
 
 	if (spi->cur_comm == SPI_SIMPLEX_TX || spi->cur_comm == SPI_3WIRE_TX) {
 		spi_finalize_current_transfer(spi->ctrl);
-		stm32f4_spi_disable(spi);
+		stm32fx_spi_disable(spi);
 	}
 }
 
@@ -1114,21 +1114,21 @@ static void stm32_spi_dma_config(struct stm32_spi *spi,
 }
 
 /**
- * stm32f4_spi_transfer_one_irq - transfer a single spi_transfer using
+ * stm32fx_spi_transfer_one_irq - transfer a single spi_transfer using
  *				  interrupts
  * @spi: pointer to the spi controller data structure
  *
  * It must returns 0 if the transfer is finished or 1 if the transfer is still
  * in progress.
  */
-static int stm32f4_spi_transfer_one_irq(struct stm32_spi *spi)
+static int stm32fx_spi_transfer_one_irq(struct stm32_spi *spi)
 {
 	unsigned long flags;
 	u32 cr2 = 0;
 
 	/* Enable the interrupts relative to the current communication mode */
 	if (spi->cur_comm == SPI_SIMPLEX_TX || spi->cur_comm == SPI_3WIRE_TX) {
-		cr2 |= STM32F4_SPI_CR2_TXEIE;
+		cr2 |= STM32FX_SPI_CR2_TXEIE;
 	} else if (spi->cur_comm == SPI_FULL_DUPLEX ||
 				spi->cur_comm == SPI_SIMPLEX_RX ||
 				spi->cur_comm == SPI_3WIRE_RX) {
@@ -1136,14 +1136,14 @@ static int stm32f4_spi_transfer_one_irq(struct stm32_spi *spi)
 		 * since the received data are never read. Therefore set OVR
 		 * interrupt only when rx buffer is available.
 		 */
-		cr2 |= STM32F4_SPI_CR2_RXNEIE | STM32F4_SPI_CR2_ERRIE;
+		cr2 |= STM32FX_SPI_CR2_RXNEIE | STM32FX_SPI_CR2_ERRIE;
 	} else {
 		return -EINVAL;
 	}
 
 	spin_lock_irqsave(&spi->lock, flags);
 
-	stm32_spi_set_bits(spi, STM32F4_SPI_CR2, cr2);
+	stm32_spi_set_bits(spi, STM32FX_SPI_CR2, cr2);
 
 	stm32_spi_enable(spi);
 
@@ -1200,11 +1200,11 @@ static int stm32h7_spi_transfer_one_irq(struct stm32_spi *spi)
 }
 
 /**
- * stm32f4_spi_transfer_one_dma_start - Set SPI driver registers to start
+ * stm32fx_spi_transfer_one_dma_start - Set SPI driver registers to start
  *					transfer using DMA
  * @spi: pointer to the spi controller data structure
  */
-static void stm32f4_spi_transfer_one_dma_start(struct stm32_spi *spi)
+static void stm32fx_spi_transfer_one_dma_start(struct stm32_spi *spi)
 {
 	/* In DMA mode end of transfer is handled by DMA TX or RX callback. */
 	if (spi->cur_comm == SPI_SIMPLEX_RX || spi->cur_comm == SPI_3WIRE_RX ||
@@ -1214,7 +1214,7 @@ static void stm32f4_spi_transfer_one_dma_start(struct stm32_spi *spi)
 		 * since the received data are never read. Therefore set OVR
 		 * interrupt only when rx buffer is available.
 		 */
-		stm32_spi_set_bits(spi, STM32F4_SPI_CR2, STM32F4_SPI_CR2_ERRIE);
+		stm32_spi_set_bits(spi, STM32FX_SPI_CR2, STM32FX_SPI_CR2_ERRIE);
 	}
 
 	stm32_spi_enable(spi);
@@ -1353,9 +1353,9 @@ static int stm32_spi_transfer_one_dma(struct stm32_spi *spi,
 static void stm32f4_spi_set_bpw(struct stm32_spi *spi)
 {
 	if (spi->cur_bpw == 16)
-		stm32_spi_set_bits(spi, STM32F4_SPI_CR1, STM32F4_SPI_CR1_DFF);
+		stm32_spi_set_bits(spi, STM32FX_SPI_CR1, STM32F4_SPI_CR1_DFF);
 	else
-		stm32_spi_clr_bits(spi, STM32F4_SPI_CR1, STM32F4_SPI_CR1_DFF);
+		stm32_spi_clr_bits(spi, STM32FX_SPI_CR1, STM32F4_SPI_CR1_DFF);
 }
 
 /**
@@ -1433,26 +1433,26 @@ static unsigned int stm32_spi_communication_type(struct spi_device *spi_dev,
 }
 
 /**
- * stm32f4_spi_set_mode - configure communication mode
+ * stm32fx_spi_set_mode - configure communication mode
  * @spi: pointer to the spi controller data structure
  * @comm_type: type of communication to configure
  */
-static int stm32f4_spi_set_mode(struct stm32_spi *spi, unsigned int comm_type)
+static int stm32fx_spi_set_mode(struct stm32_spi *spi, unsigned int comm_type)
 {
 	if (comm_type == SPI_3WIRE_TX || comm_type == SPI_SIMPLEX_TX) {
-		stm32_spi_set_bits(spi, STM32F4_SPI_CR1,
-					STM32F4_SPI_CR1_BIDIMODE |
-					STM32F4_SPI_CR1_BIDIOE);
+		stm32_spi_set_bits(spi, STM32FX_SPI_CR1,
+					STM32FX_SPI_CR1_BIDIMODE |
+					STM32FX_SPI_CR1_BIDIOE);
 	} else if (comm_type == SPI_FULL_DUPLEX ||
 				comm_type == SPI_SIMPLEX_RX) {
-		stm32_spi_clr_bits(spi, STM32F4_SPI_CR1,
-					STM32F4_SPI_CR1_BIDIMODE |
-					STM32F4_SPI_CR1_BIDIOE);
+		stm32_spi_clr_bits(spi, STM32FX_SPI_CR1,
+					STM32FX_SPI_CR1_BIDIMODE |
+					STM32FX_SPI_CR1_BIDIOE);
 	} else if (comm_type == SPI_3WIRE_RX) {
-		stm32_spi_set_bits(spi, STM32F4_SPI_CR1,
-					STM32F4_SPI_CR1_BIDIMODE);
-		stm32_spi_clr_bits(spi, STM32F4_SPI_CR1,
-					STM32F4_SPI_CR1_BIDIOE);
+		stm32_spi_set_bits(spi, STM32FX_SPI_CR1,
+					STM32FX_SPI_CR1_BIDIMODE);
+		stm32_spi_clr_bits(spi, STM32FX_SPI_CR1,
+					STM32FX_SPI_CR1_BIDIOE);
 	} else {
 		return -EINVAL;
 	}
@@ -1672,18 +1672,18 @@ static int stm32_spi_unprepare_msg(struct spi_controller *ctrl,
 }
 
 /**
- * stm32f4_spi_config - Configure SPI controller as SPI master
+ * stm32fx_spi_config - Configure SPI controller as SPI master
  * @spi: pointer to the spi controller data structure
  */
-static int stm32f4_spi_config(struct stm32_spi *spi)
+static int stm32fx_spi_config(struct stm32_spi *spi)
 {
 	unsigned long flags;
 
 	spin_lock_irqsave(&spi->lock, flags);
 
 	/* Ensure I2SMOD bit is kept cleared */
-	stm32_spi_clr_bits(spi, STM32F4_SPI_I2SCFGR,
-			   STM32F4_SPI_I2SCFGR_I2SMOD);
+	stm32_spi_clr_bits(spi, STM32FX_SPI_I2SCFGR,
+			   STM32FX_SPI_I2SCFGR_I2SMOD);
 
 	/*
 	 * - SS input value high
@@ -1692,10 +1692,10 @@ static int stm32f4_spi_config(struct stm32_spi *spi)
 	 * - Consider 1 master/n slaves configuration and
 	 *   SS input value is determined by the SSI bit
 	 */
-	stm32_spi_set_bits(spi, STM32F4_SPI_CR1, STM32F4_SPI_CR1_SSI |
-						 STM32F4_SPI_CR1_BIDIOE |
-						 STM32F4_SPI_CR1_MSTR |
-						 STM32F4_SPI_CR1_SSM);
+	stm32_spi_set_bits(spi, STM32FX_SPI_CR1, STM32FX_SPI_CR1_SSI |
+						 STM32FX_SPI_CR1_BIDIOE |
+						 STM32FX_SPI_CR1_MSTR |
+						 STM32FX_SPI_CR1_SSM);
 
 	spin_unlock_irqrestore(&spi->lock, flags);
 
@@ -1746,20 +1746,20 @@ static int stm32h7_spi_config(struct stm32_spi *spi)
 }
 
 static const struct stm32_spi_cfg stm32f4_spi_cfg = {
-	.regs = &stm32f4_spi_regspec,
+	.regs = &stm32fx_spi_regspec,
 	.get_bpw_mask = stm32f4_spi_get_bpw_mask,
-	.disable = stm32f4_spi_disable,
-	.config = stm32f4_spi_config,
+	.disable = stm32fx_spi_disable,
+	.config = stm32fx_spi_config,
 	.set_bpw = stm32f4_spi_set_bpw,
-	.set_mode = stm32f4_spi_set_mode,
-	.transfer_one_dma_start = stm32f4_spi_transfer_one_dma_start,
-	.dma_tx_cb = stm32f4_spi_dma_tx_cb,
+	.set_mode = stm32fx_spi_set_mode,
+	.transfer_one_dma_start = stm32fx_spi_transfer_one_dma_start,
+	.dma_tx_cb = stm32fx_spi_dma_tx_cb,
 	.dma_rx_cb = stm32_spi_dma_rx_cb,
-	.transfer_one_irq = stm32f4_spi_transfer_one_irq,
-	.irq_handler_event = stm32f4_spi_irq_event,
-	.irq_handler_thread = stm32f4_spi_irq_thread,
-	.baud_rate_div_min = STM32F4_SPI_BR_DIV_MIN,
-	.baud_rate_div_max = STM32F4_SPI_BR_DIV_MAX,
+	.transfer_one_irq = stm32fx_spi_transfer_one_irq,
+	.irq_handler_event = stm32fx_spi_irq_event,
+	.irq_handler_thread = stm32fx_spi_irq_thread,
+	.baud_rate_div_min = STM32FX_SPI_BR_DIV_MIN,
+	.baud_rate_div_max = STM32FX_SPI_BR_DIV_MAX,
 	.has_fifo = false,
 	.has_device_mode = false,
 	.flags = SPI_CONTROLLER_MUST_TX,
-- 
2.42.0

[PATCH 2/5] spi: stm32: use callbacks for read_rx and write_tx

[Ben Wolsieffer]

The STM32F7 will require different read and write routines, so make
these functions into configurable callbacks.

Signed-off-by: Ben Wolsieffer <ben.wolsieffer@hefring.com>
---
 drivers/spi/spi-stm32.c | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/drivers/spi/spi-stm32.c b/drivers/spi/spi-stm32.c
index 02d1409d7229..427788d18532 100644
--- a/drivers/spi/spi-stm32.c
+++ b/drivers/spi/spi-stm32.c
@@ -229,6 +229,8 @@ struct stm32_spi;
  * time between frames (if driver has this functionality)
  * @set_number_of_data: optional routine to configure registers to desired
  * number of data (if driver has this functionality)
+ * @write_tx: routine to write to transmit register/FIFO
+ * @read_rx: routine to read from receive register/FIFO
  * @transfer_one_dma_start: routine to start transfer a single spi_transfer
  * using DMA
  * @dma_rx_cb: routine to call after DMA RX channel operation is complete
@@ -252,6 +254,8 @@ struct stm32_spi_cfg {
 	int (*set_mode)(struct stm32_spi *spi, unsigned int comm_type);
 	void (*set_data_idleness)(struct stm32_spi *spi, u32 length);
 	int (*set_number_of_data)(struct stm32_spi *spi, u32 length);
+	void (*write_tx)(struct stm32_spi *spi);
+	void (*read_rx)(struct stm32_spi *spi);
 	void (*transfer_one_dma_start)(struct stm32_spi *spi);
 	void (*dma_rx_cb)(void *data);
 	void (*dma_tx_cb)(void *data);
@@ -822,17 +826,17 @@ static irqreturn_t stm32fx_spi_irq_event(int irq, void *dev_id)
 
 	if (sr & STM32FX_SPI_SR_TXE) {
 		if (spi->tx_buf)
-			stm32f4_spi_write_tx(spi);
+			spi->cfg->write_tx(spi);
 		if (spi->tx_len == 0)
 			end = true;
 	}
 
 	if (sr & STM32FX_SPI_SR_RXNE) {
-		stm32f4_spi_read_rx(spi);
+		spi->cfg->read_rx(spi);
 		if (spi->rx_len == 0)
 			end = true;
 		else if (spi->tx_buf)/* Load data for discontinuous mode */
-			stm32f4_spi_write_tx(spi);
+			spi->cfg->write_tx(spi);
 	}
 
 end_irq:
@@ -1149,7 +1153,7 @@ static int stm32fx_spi_transfer_one_irq(struct stm32_spi *spi)
 
 	/* starting data transfer when buffer is loaded */
 	if (spi->tx_buf)
-		stm32f4_spi_write_tx(spi);
+		spi->cfg->write_tx(spi);
 
 	spin_unlock_irqrestore(&spi->lock, flags);
 
@@ -1752,6 +1756,8 @@ static const struct stm32_spi_cfg stm32f4_spi_cfg = {
 	.config = stm32fx_spi_config,
 	.set_bpw = stm32f4_spi_set_bpw,
 	.set_mode = stm32fx_spi_set_mode,
+	.write_tx = stm32f4_spi_write_tx,
+	.read_rx = stm32f4_spi_read_rx,
 	.transfer_one_dma_start = stm32fx_spi_transfer_one_dma_start,
 	.dma_tx_cb = stm32fx_spi_dma_tx_cb,
 	.dma_rx_cb = stm32_spi_dma_rx_cb,
@@ -1775,6 +1781,8 @@ static const struct stm32_spi_cfg stm32h7_spi_cfg = {
 	.set_mode = stm32h7_spi_set_mode,
 	.set_data_idleness = stm32h7_spi_data_idleness,
 	.set_number_of_data = stm32h7_spi_number_of_data,
+	.write_tx = stm32h7_spi_write_txfifo,
+	.read_rx = stm32h7_spi_read_rxfifo,
 	.transfer_one_dma_start = stm32h7_spi_transfer_one_dma_start,
 	.dma_rx_cb = stm32_spi_dma_rx_cb,
 	/*
-- 
2.42.0

[PATCH 3/5] dt-bindings: spi: add stm32f7-spi compatible

[Ben Wolsieffer]

Signed-off-by: Ben Wolsieffer <ben.wolsieffer@hefring.com>
---
 Documentation/devicetree/bindings/spi/st,stm32-spi.yaml | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Documentation/devicetree/bindings/spi/st,stm32-spi.yaml b/Documentation/devicetree/bindings/spi/st,stm32-spi.yaml
index ae0f082bd377..5754d603f34f 100644
--- a/Documentation/devicetree/bindings/spi/st,stm32-spi.yaml
+++ b/Documentation/devicetree/bindings/spi/st,stm32-spi.yaml
@@ -23,6 +23,7 @@ properties:
   compatible:
     enum:
       - st,stm32f4-spi
+      - st,stm32f7-spi
       - st,stm32h7-spi
 
   reg:
-- 
2.42.0

[PATCH 4/5] spi: stm32: add STM32F7 support

[Ben Wolsieffer]

The STM32F7 SPI peripheral is similar to the STM32F4, except it allows
arbitrary word lengths between 4 and 16 bits, and has a small 32-bit
FIFO that allows two 8-bit or smaller words to be transferred with a
single 16-bit read/write.

Signed-off-by: Ben Wolsieffer <ben.wolsieffer@hefring.com>
---
 drivers/spi/spi-stm32.c | 149 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 149 insertions(+)

diff --git a/drivers/spi/spi-stm32.c b/drivers/spi/spi-stm32.c
index 427788d18532..94df3836834c 100644
--- a/drivers/spi/spi-stm32.c
+++ b/drivers/spi/spi-stm32.c
@@ -41,6 +41,7 @@
 #define STM32FX_SPI_CR1_SSM		BIT(9)
 #define STM32FX_SPI_CR1_RXONLY		BIT(10)
 #define STM32F4_SPI_CR1_DFF		BIT(11)
+#define STM32F7_SPI_CR1_CRCL		BIT(11)
 #define STM32FX_SPI_CR1_CRCNEXT		BIT(12)
 #define STM32FX_SPI_CR1_CRCEN		BIT(13)
 #define STM32FX_SPI_CR1_BIDIOE		BIT(14)
@@ -56,6 +57,10 @@
 #define STM32FX_SPI_CR2_ERRIE		BIT(5)
 #define STM32FX_SPI_CR2_RXNEIE		BIT(6)
 #define STM32FX_SPI_CR2_TXEIE		BIT(7)
+#define STM32F7_SPI_CR2_DS		GENMASK(11, 8)
+#define STM32F7_SPI_CR2_FRXTH		BIT(12)
+#define STM32F7_SPI_CR2_LDMA_RX		BIT(13)
+#define STM32F7_SPI_CR2_LDMA_TX		BIT(14)
 
 /* STM32FX_SPI_SR bit fields */
 #define STM32FX_SPI_SR_RXNE		BIT(0)
@@ -67,6 +72,8 @@
 #define STM32FX_SPI_SR_OVR		BIT(6)
 #define STM32FX_SPI_SR_BSY		BIT(7)
 #define STM32FX_SPI_SR_FRE		BIT(8)
+#define STM32F7_SPI_SR_FRLVL		GENMASK(10, 9)
+#define STM32F7_SPI_SR_FTLVL		GENMASK(12, 11)
 
 /* STM32FX_SPI_I2SCFGR bit fields */
 #define STM32FX_SPI_I2SCFGR_I2SMOD	BIT(11)
@@ -413,6 +420,16 @@ static int stm32f4_spi_get_bpw_mask(struct stm32_spi *spi)
 	return SPI_BPW_MASK(8) | SPI_BPW_MASK(16);
 }
 
+/**
+ * stm32f7_spi_get_bpw_mask - Return bits per word mask
+ * @spi: pointer to the spi controller data structure
+ */
+static int stm32f7_spi_get_bpw_mask(struct stm32_spi *spi)
+{
+	dev_dbg(spi->dev, "16-bit maximum data frame\n");
+	return SPI_BPW_RANGE_MASK(4, 16);
+}
+
 /**
  * stm32h7_spi_get_bpw_mask - Return bits per word mask
  * @spi: pointer to the spi controller data structure
@@ -526,6 +543,35 @@ static void stm32f4_spi_write_tx(struct stm32_spi *spi)
 	dev_dbg(spi->dev, "%s: %d bytes left\n", __func__, spi->tx_len);
 }
 
+/**
+ * stm32f7_spi_write_tx - Write bytes to Transmit Data Register
+ * @spi: pointer to the spi controller data structure
+ *
+ * Read from tx_buf depends on remaining bytes to avoid to read beyond
+ * tx_buf end.
+ */
+static void stm32f7_spi_write_tx(struct stm32_spi *spi)
+{
+	if ((spi->tx_len > 0) && (readl_relaxed(spi->base + STM32FX_SPI_SR) &
+				  STM32FX_SPI_SR_TXE)) {
+		u32 offs = spi->cur_xferlen - spi->tx_len;
+
+		if (spi->tx_len >= sizeof(u16)) {
+			const u16 *tx_buf16 = (const u16 *)(spi->tx_buf + offs);
+
+			writew_relaxed(*tx_buf16, spi->base + STM32FX_SPI_DR);
+			spi->tx_len -= sizeof(u16);
+		} else {
+			const u8 *tx_buf8 = (const u8 *)(spi->tx_buf + offs);
+
+			writeb_relaxed(*tx_buf8, spi->base + STM32FX_SPI_DR);
+			spi->tx_len -= sizeof(u8);
+		}
+	}
+
+	dev_dbg(spi->dev, "%s: %d bytes left\n", __func__, spi->tx_len);
+}
+
 /**
  * stm32h7_spi_write_txfifo - Write bytes in Transmit Data Register
  * @spi: pointer to the spi controller data structure
@@ -590,6 +636,46 @@ static void stm32f4_spi_read_rx(struct stm32_spi *spi)
 	dev_dbg(spi->dev, "%s: %d bytes left\n", __func__, spi->rx_len);
 }
 
+/**
+ * stm32f7_spi_read_rx - Read bytes from Receive Data Register
+ * @spi: pointer to the spi controller data structure
+ *
+ * Write in rx_buf depends on remaining bytes to avoid to write beyond
+ * rx_buf end.
+ */
+static void stm32f7_spi_read_rx(struct stm32_spi *spi)
+{
+	u32 sr = readl_relaxed(spi->base + STM32FX_SPI_SR);
+	u32 frlvl = FIELD_GET(STM32F7_SPI_SR_FRLVL, sr);
+
+	while ((spi->rx_len > 0) && (frlvl > 0)) {
+		u32 offs = spi->cur_xferlen - spi->rx_len;
+
+		if ((spi->rx_len >= sizeof(u16)) && (frlvl >= 2)) {
+			u16 *rx_buf16 = (u16 *)(spi->rx_buf + offs);
+
+			*rx_buf16 = readw_relaxed(spi->base + STM32FX_SPI_DR);
+			spi->rx_len -= sizeof(u16);
+		} else {
+			u8 *rx_buf8 = (u8 *)(spi->rx_buf + offs);
+
+			*rx_buf8 = readb_relaxed(spi->base + STM32FX_SPI_DR);
+			spi->rx_len -= sizeof(u8);
+		}
+
+		sr = readl_relaxed(spi->base + STM32FX_SPI_SR);
+		frlvl = FIELD_GET(STM32F7_SPI_SR_FRLVL, sr);
+	}
+
+	if (spi->rx_len >= sizeof(u16))
+		stm32_spi_clr_bits(spi, STM32FX_SPI_CR2, STM32F7_SPI_CR2_FRXTH);
+	else
+		stm32_spi_set_bits(spi, STM32FX_SPI_CR2, STM32F7_SPI_CR2_FRXTH);
+
+	dev_dbg(spi->dev, "%s: %d bytes left (sr=%08x)\n",
+		__func__, spi->rx_len, sr);
+}
+
 /**
  * stm32h7_spi_read_rxfifo - Read bytes in Receive Data Register
  * @spi: pointer to the spi controller data structure
@@ -1224,6 +1310,22 @@ static void stm32fx_spi_transfer_one_dma_start(struct stm32_spi *spi)
 	stm32_spi_enable(spi);
 }
 
+/**
+ * stm32f7_spi_transfer_one_dma_start - Set SPI driver registers to start
+ *					transfer using DMA
+ * @spi: pointer to the spi controller data structure
+ */
+static void stm32f7_spi_transfer_one_dma_start(struct stm32_spi *spi)
+{
+	/* Configure DMA request trigger threshold according to DMA width */
+	if (spi->cur_bpw <= 8)
+		stm32_spi_set_bits(spi, STM32FX_SPI_CR2, STM32F7_SPI_CR2_FRXTH);
+	else
+		stm32_spi_clr_bits(spi, STM32FX_SPI_CR2, STM32F7_SPI_CR2_FRXTH);
+
+	stm32fx_spi_transfer_one_dma_start(spi);
+}
+
 /**
  * stm32h7_spi_transfer_one_dma_start - Set SPI driver registers to start
  *					transfer using DMA
@@ -1362,6 +1464,31 @@ static void stm32f4_spi_set_bpw(struct stm32_spi *spi)
 		stm32_spi_clr_bits(spi, STM32FX_SPI_CR1, STM32F4_SPI_CR1_DFF);
 }
 
+/**
+ * stm32f7_spi_set_bpw - Configure bits per word
+ * @spi: pointer to the spi controller data structure
+ */
+static void stm32f7_spi_set_bpw(struct stm32_spi *spi)
+{
+	u32 bpw;
+	u32 cr2_clrb = 0, cr2_setb = 0;
+
+	bpw = spi->cur_bpw - 1;
+
+	cr2_clrb |= STM32F7_SPI_CR2_DS;
+	cr2_setb |= FIELD_PREP(STM32F7_SPI_CR2_DS, bpw);
+
+	if (spi->rx_len >= sizeof(u16))
+		cr2_clrb |= STM32F7_SPI_CR2_FRXTH;
+	else
+		cr2_setb |= STM32F7_SPI_CR2_FRXTH;
+
+	writel_relaxed(
+		(readl_relaxed(spi->base + STM32FX_SPI_CR2) &
+		 ~cr2_clrb) | cr2_setb,
+		spi->base + STM32FX_SPI_CR2);
+}
+
 /**
  * stm32h7_spi_set_bpw - configure bits per word
  * @spi: pointer to the spi controller data structure
@@ -1771,6 +1898,27 @@ static const struct stm32_spi_cfg stm32f4_spi_cfg = {
 	.flags = SPI_CONTROLLER_MUST_TX,
 };
 
+static const struct stm32_spi_cfg stm32f7_spi_cfg = {
+	.regs = &stm32fx_spi_regspec,
+	.get_bpw_mask = stm32f7_spi_get_bpw_mask,
+	.disable = stm32fx_spi_disable,
+	.config = stm32fx_spi_config,
+	.set_bpw = stm32f7_spi_set_bpw,
+	.set_mode = stm32fx_spi_set_mode,
+	.write_tx = stm32f7_spi_write_tx,
+	.read_rx = stm32f7_spi_read_rx,
+	.transfer_one_dma_start = stm32f7_spi_transfer_one_dma_start,
+	.dma_tx_cb = stm32fx_spi_dma_tx_cb,
+	.dma_rx_cb = stm32_spi_dma_rx_cb,
+	.transfer_one_irq = stm32fx_spi_transfer_one_irq,
+	.irq_handler_event = stm32fx_spi_irq_event,
+	.irq_handler_thread = stm32fx_spi_irq_thread,
+	.baud_rate_div_min = STM32FX_SPI_BR_DIV_MIN,
+	.baud_rate_div_max = STM32FX_SPI_BR_DIV_MAX,
+	.has_fifo = false,
+	.flags = SPI_CONTROLLER_MUST_TX,
+};
+
 static const struct stm32_spi_cfg stm32h7_spi_cfg = {
 	.regs = &stm32h7_spi_regspec,
 	.get_fifo_size = stm32h7_spi_get_fifo_size,
@@ -1800,6 +1948,7 @@ static const struct stm32_spi_cfg stm32h7_spi_cfg = {
 static const struct of_device_id stm32_spi_of_match[] = {
 	{ .compatible = "st,stm32h7-spi", .data = (void *)&stm32h7_spi_cfg },
 	{ .compatible = "st,stm32f4-spi", .data = (void *)&stm32f4_spi_cfg },
+	{ .compatible = "st,stm32f7-spi", .data = (void *)&stm32f7_spi_cfg },
 	{},
 };
 MODULE_DEVICE_TABLE(of, stm32_spi_of_match);
-- 
2.42.0

[PATCH 5/5] ARM: dts: stm32: add SPI support on STM32F746

[Ben Wolsieffer]

Add device tree nodes for the STM32F746 SPI controllers.

Signed-off-by: Ben Wolsieffer <ben.wolsieffer@hefring.com>
---
 arch/arm/boot/dts/st/stm32f746.dtsi | 60 +++++++++++++++++++++++++++++
 1 file changed, 60 insertions(+)

diff --git a/arch/arm/boot/dts/st/stm32f746.dtsi b/arch/arm/boot/dts/st/stm32f746.dtsi
index cce6ab0e4617..15ad965f8d96 100644
--- a/arch/arm/boot/dts/st/stm32f746.dtsi
+++ b/arch/arm/boot/dts/st/stm32f746.dtsi
@@ -281,6 +281,26 @@ gcan3: gcan@40003600 {
 			clocks = <&rcc 0 STM32F7_APB1_CLOCK(CAN3)>;
 		};
 
+		spi2: spi@40003800 {
+			#address-cells = <1>;
+			#size-cells = <0>;
+			compatible = "st,stm32f7-spi";
+			reg = <0x40003800 0x400>;
+			interrupts = <36>;
+			clocks = <&rcc 0 STM32F7_APB1_CLOCK(SPI2)>;
+			status = "disabled";
+		};
+
+		spi3: spi@40003c00 {
+			#address-cells = <1>;
+			#size-cells = <0>;
+			compatible = "st,stm32f7-spi";
+			reg = <0x40003c00 0x400>;
+			interrupts = <51>;
+			clocks = <&rcc 0 STM32F7_APB1_CLOCK(SPI3)>;
+			status = "disabled";
+		};
+
 		usart2: serial@40004400 {
 			compatible = "st,stm32f7-uart";
 			reg = <0x40004400 0x400>;
@@ -498,6 +518,26 @@ sdio1: mmc@40012c00 {
 			status = "disabled";
 		};
 
+		spi1: spi@40013000 {
+			#address-cells = <1>;
+			#size-cells = <0>;
+			compatible = "st,stm32f7-spi";
+			reg = <0x40013000 0x400>;
+			interrupts = <35>;
+			clocks = <&rcc 0 STM32F7_APB2_CLOCK(SPI1)>;
+			status = "disabled";
+		};
+
+		spi4: spi@40013400 {
+			#address-cells = <1>;
+			#size-cells = <0>;
+			compatible = "st,stm32f7-spi";
+			reg = <0x40013400 0x400>;
+			interrupts = <84>;
+			clocks = <&rcc 0 STM32F7_APB2_CLOCK(SPI4)>;
+			status = "disabled";
+		};
+
 		syscfg: syscon@40013800 {
 			compatible = "st,stm32-syscfg", "syscon";
 			reg = <0x40013800 0x400>;
@@ -562,6 +602,26 @@ pwm {
 			};
 		};
 
+		spi5: spi@40015000 {
+			#address-cells = <1>;
+			#size-cells = <0>;
+			compatible = "st,stm32f7-spi";
+			reg = <0x40015000 0x400>;
+			interrupts = <85>;
+			clocks = <&rcc 0 STM32F7_APB2_CLOCK(SPI5)>;
+			status = "disabled";
+		};
+
+		spi6: spi@40015400 {
+			#address-cells = <1>;
+			#size-cells = <0>;
+			compatible = "st,stm32f7-spi";
+			reg = <0x40015400 0x400>;
+			interrupts = <86>;
+			clocks = <&rcc 0 STM32F7_APB2_CLOCK(SPI6)>;
+			status = "disabled";
+		};
+
 		ltdc: display-controller@40016800 {
 			compatible = "st,stm32-ltdc";
 			reg = <0x40016800 0x200>;
-- 
2.42.0

Re: [PATCH 3/5] dt-bindings: spi: add stm32f7-spi compatible

[Conor Dooley]

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On Wed, Nov 01, 2023 at 11:08:08AM -0400, Ben Wolsieffer wrote:

Missing commit body. The information from the driver patch about the
differences between this and other versions of the IP would be suitable.

Cheers,
Conor.

> Signed-off-by: Ben Wolsieffer <ben.wolsieffer@hefring.com>
> ---
>  Documentation/devicetree/bindings/spi/st,stm32-spi.yaml | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/Documentation/devicetree/bindings/spi/st,stm32-spi.yaml b/Documentation/devicetree/bindings/spi/st,stm32-spi.yaml
> index ae0f082bd377..5754d603f34f 100644
> --- a/Documentation/devicetree/bindings/spi/st,stm32-spi.yaml
> +++ b/Documentation/devicetree/bindings/spi/st,stm32-spi.yaml
> @@ -23,6 +23,7 @@ properties:
>    compatible:
>      enum:
>        - st,stm32f4-spi
> +      - st,stm32f7-spi
>        - st,stm32h7-spi
>  
>    reg:
> -- 
> 2.42.0
> 

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