linux-kernel - [PATCH v4 08/15] spi: export spi_transfer_cs_change_delay

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Date:   Thu,  9 Feb 2023 12:02:39 -0800
From:   William Zhang <william.zhang@...adcom.com>
To:     Linux SPI List <linux-spi@...r.kernel.org>,
        Broadcom Kernel List <bcm-kernel-feedback-list@...adcom.com>
Cc:     f.fainelli@...il.com, dregan@...l.com, joel.peshkin@...adcom.com,
        dan.beygelman@...adcom.com, anand.gore@...adcom.com,
        kursad.oney@...adcom.com, tomer.yacoby@...adcom.com,
        jonas.gorski@...il.com, William Zhang <william.zhang@...adcom.com>,
        Mark Brown <broonie@...nel.org>, linux-kernel@...r.kernel.org
Subject: [PATCH v4 08/15] spi: export spi_transfer_cs_change_delay_exec function

For SPI controller that implements transfer_one_message, it needs to
insert the delay that required by cs change event between the transfers.
Add a wrapper for the local function _spi_transfer_cs_change_delay_exec
and export it for SPI controller driver to use.

Signed-off-by: William Zhang <william.zhang@...adcom.com>

---

Changes in v4:
- Rebase using the latest linux spi git for-next branch code

 drivers/spi/spi.c       | 7 +++++++
 include/linux/spi/spi.h | 5 +++--
 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index 21a8c3a8eee4..f4eb447c565d 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -1483,6 +1483,13 @@ static void _spi_transfer_cs_change_delay(struct spi_message *msg,
 	}
 }
 
+void spi_transfer_cs_change_delay_exec(struct spi_message *msg,
+						  struct spi_transfer *xfer)
+{
+	_spi_transfer_cs_change_delay(msg, xfer);
+}
+EXPORT_SYMBOL_GPL(spi_transfer_cs_change_delay_exec);
+
 /*
  * spi_transfer_one_message - Default implementation of transfer_one_message()
  *
diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h
index 9b23a1d0dd0d..88cb2a1390ce 100644
--- a/include/linux/spi/spi.h
+++ b/include/linux/spi/spi.h
@@ -26,6 +26,7 @@ struct spi_controller;
 struct spi_transfer;
 struct spi_controller_mem_ops;
 struct spi_controller_mem_caps;
+struct spi_message;
 
 /*
  * INTERFACES between SPI master-side drivers and SPI slave protocol handlers,
@@ -119,6 +120,8 @@ struct spi_delay {
 
 extern int spi_delay_to_ns(struct spi_delay *_delay, struct spi_transfer *xfer);
 extern int spi_delay_exec(struct spi_delay *_delay, struct spi_transfer *xfer);
+extern void spi_transfer_cs_change_delay_exec(struct spi_message *msg,
+						  struct spi_transfer *xfer);
 
 /**
  * struct spi_device - Controller side proxy for an SPI slave device
@@ -283,8 +286,6 @@ static inline void spi_set_csgpiod(struct spi_device *spi, u8 idx, struct gpio_d
 	spi->cs_gpiod = csgpiod;
 }
 
-struct spi_message;
-
 /**
  * struct spi_driver - Host side "protocol" driver
  * @id_table: List of SPI devices supported by this driver
-- 
2.37.3