diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h
index 873ced6ae4ca..cfe42f8cd7a4 100644
--- a/include/linux/spi/spi.h
+++ b/include/linux/spi/spi.h
@@ -184,8 +184,18 @@ struct spi_device {
 	u8			chip_select;
 	u8			bits_per_word;
 	bool			rt;
-#define SPI_NO_TX	BIT(31)		/* No transmit wire */
-#define SPI_NO_RX	BIT(30)		/* No receive wire */
+#define SPI_NO_TX		BIT(31)		/* No transmit wire */
+#define SPI_NO_RX		BIT(30)		/* No receive wire */
+	/*
+	 * TPM specification defines flow control over SPI. Client device
+	 * can insert a wait state on MISO when address is transmitted by
+	 * controller on MOSI. Detecting the wait state in software is only
+	 * possible for full duplex controllers. For controllers that support
+	 * only half-duplex, the wait state detection needs to be implemented
+	 * in hardware. TPM devices would set this flag when hardware flow
+	 * control is expected from SPI controller.
+	 */
+#define SPI_TPM_HW_FLOW		BIT(29)		/* TPM HW flow control */
 	/*
 	 * All bits defined above should be covered by SPI_MODE_KERNEL_MASK.
 	 * The SPI_MODE_KERNEL_MASK has the SPI_MODE_USER_MASK counterpart,
@@ -195,7 +205,7 @@ struct spi_device {
 	 * These bits must not overlap. A static assert check should make sure of that.
 	 * If adding extra bits, make sure to decrease the bit index below as well.
 	 */
-#define SPI_MODE_KERNEL_MASK	(~(BIT(30) - 1))
+#define SPI_MODE_KERNEL_MASK	(~(BIT(29) - 1))
 	u32			mode;
 	int			irq;
 	void			*controller_state;