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Date: Fri, 27 Nov 2020 15:08:32 +0200
From: Alexandru Ardelean <alexandru.ardelean@...log.com>
To: <linux-spi@...r.kernel.org>, <devicetree@...r.kernel.org>,
<linux-kernel@...r.kernel.org>
CC: <robh+dt@...nel.org>, <broonie@...nel.org>,
<andy.shevchenko@...il.com>, <dragos.bogdan@...log.com>,
Alexandru Ardelean <alexandru.ardelean@...log.com>
Subject: [PATCH v3 1/3] spi: uapi: unify SPI modes into a single spi.h header
This change moves all the SPI mode bits into a separate 'spi.h' header in
uapi. This is meant to re-use these definitions inside the kernel as well
as export them to userspace (via uapi).
The SPI mode definitions have usually been duplicated between between
'include/linux/spi/spi.h' and 'include/uapi/linux/spi/spidev.h', so
whenever adding a new entry, this would need to be put in both headers.
They've been moved from 'include/linux/spi/spi.h', since that seems a bit
more complete; the bits have descriptions and there is the SPI_MODE_X_MASK.
For now, this change does a simple move; no conversions to BIT() macros are
being done at this point. This can be done later, as that requires also
another header inclusion (the 'const.h' header).
The change as-is makes this 'spi.h' header more standalone.
Signed-off-by: Alexandru Ardelean <alexandru.ardelean@...log.com>
---
Personally, I am not sure whether to convert the bitfield tos _BITUL()
macros or not. I feel that not-having these macros makes this uapi spi.h
header more standalone.
If there's a strong insistence to use those _BITUL() macros, I'll do it.
I'm hesitant now, because it requires that this spi.h includes the
'const.h' header.
Changelog v2 -> v3:
* https://lore.kernel.org/linux-spi/20201124102152.16548-1-alexandru.ardelean@analog.com/
* dropped 'spi: convert to BIT() all spi_device flags '
added 'spi: uapi: unify SPI modes into a single spi.h header'
include/linux/spi/spi.h | 22 +--------------
include/uapi/linux/spi/spi.h | 47 +++++++++++++++++++++++++++++++++
include/uapi/linux/spi/spidev.h | 30 +--------------------
3 files changed, 49 insertions(+), 50 deletions(-)
create mode 100644 include/uapi/linux/spi/spi.h
diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h
index aa09fdc8042d..a4fedb33d34b 100644
--- a/include/linux/spi/spi.h
+++ b/include/linux/spi/spi.h
@@ -14,6 +14,7 @@
#include <linux/scatterlist.h>
#include <linux/gpio/consumer.h>
#include <linux/ptp_clock_kernel.h>
+#include <uapi/linux/spi/spi.h>
struct dma_chan;
struct property_entry;
@@ -165,27 +166,6 @@ struct spi_device {
u8 bits_per_word;
bool rt;
u32 mode;
-#define SPI_CPHA 0x01 /* clock phase */
-#define SPI_CPOL 0x02 /* clock polarity */
-#define SPI_MODE_0 (0|0) /* (original MicroWire) */
-#define SPI_MODE_1 (0|SPI_CPHA)
-#define SPI_MODE_2 (SPI_CPOL|0)
-#define SPI_MODE_3 (SPI_CPOL|SPI_CPHA)
-#define SPI_MODE_X_MASK (SPI_CPOL|SPI_CPHA)
-#define SPI_CS_HIGH 0x04 /* chipselect active high? */
-#define SPI_LSB_FIRST 0x08 /* per-word bits-on-wire */
-#define SPI_3WIRE 0x10 /* SI/SO signals shared */
-#define SPI_LOOP 0x20 /* loopback mode */
-#define SPI_NO_CS 0x40 /* 1 dev/bus, no chipselect */
-#define SPI_READY 0x80 /* slave pulls low to pause */
-#define SPI_TX_DUAL 0x100 /* transmit with 2 wires */
-#define SPI_TX_QUAD 0x200 /* transmit with 4 wires */
-#define SPI_RX_DUAL 0x400 /* receive with 2 wires */
-#define SPI_RX_QUAD 0x800 /* receive with 4 wires */
-#define SPI_CS_WORD 0x1000 /* toggle cs after each word */
-#define SPI_TX_OCTAL 0x2000 /* transmit with 8 wires */
-#define SPI_RX_OCTAL 0x4000 /* receive with 8 wires */
-#define SPI_3WIRE_HIZ 0x8000 /* high impedance turnaround */
int irq;
void *controller_state;
void *controller_data;
diff --git a/include/uapi/linux/spi/spi.h b/include/uapi/linux/spi/spi.h
new file mode 100644
index 000000000000..ae028d64c779
--- /dev/null
+++ b/include/uapi/linux/spi/spi.h
@@ -0,0 +1,47 @@
+/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
+/*
+ * include/linux/spi/spi.h
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#ifndef _UAPI_SPI_H
+#define _UAPI_SPI_H
+
+#define SPI_CPHA 0x01 /* clock phase */
+#define SPI_CPOL 0x02 /* clock polarity */
+
+#define SPI_MODE_0 (0|0) /* (original MicroWire) */
+#define SPI_MODE_1 (0|SPI_CPHA)
+#define SPI_MODE_2 (SPI_CPOL|0)
+#define SPI_MODE_3 (SPI_CPOL|SPI_CPHA)
+#define SPI_MODE_X_MASK (SPI_CPOL|SPI_CPHA)
+
+#define SPI_CS_HIGH 0x04 /* chipselect active high? */
+#define SPI_LSB_FIRST 0x08 /* per-word bits-on-wire */
+#define SPI_3WIRE 0x10 /* SI/SO signals shared */
+#define SPI_LOOP 0x20 /* loopback mode */
+#define SPI_NO_CS 0x40 /* 1 dev/bus, no chipselect */
+#define SPI_READY 0x80 /* slave pulls low to pause */
+#define SPI_TX_DUAL 0x100 /* transmit with 2 wires */
+#define SPI_TX_QUAD 0x200 /* transmit with 4 wires */
+#define SPI_RX_DUAL 0x400 /* receive with 2 wires */
+#define SPI_RX_QUAD 0x800 /* receive with 4 wires */
+#define SPI_CS_WORD 0x1000 /* toggle cs after each word */
+#define SPI_TX_OCTAL 0x2000 /* transmit with 8 wires */
+#define SPI_RX_OCTAL 0x4000 /* receive with 8 wires */
+#define SPI_3WIRE_HIZ 0x8000 /* high impedance turnaround */
+
+#endif /* _UAPI_SPI_H */
diff --git a/include/uapi/linux/spi/spidev.h b/include/uapi/linux/spi/spidev.h
index d56427c0b3e0..0c3da08f2aff 100644
--- a/include/uapi/linux/spi/spidev.h
+++ b/include/uapi/linux/spi/spidev.h
@@ -25,35 +25,7 @@
#include <linux/types.h>
#include <linux/ioctl.h>
-
-/* User space versions of kernel symbols for SPI clocking modes,
- * matching <linux/spi/spi.h>
- */
-
-#define SPI_CPHA 0x01
-#define SPI_CPOL 0x02
-
-#define SPI_MODE_0 (0|0)
-#define SPI_MODE_1 (0|SPI_CPHA)
-#define SPI_MODE_2 (SPI_CPOL|0)
-#define SPI_MODE_3 (SPI_CPOL|SPI_CPHA)
-
-#define SPI_CS_HIGH 0x04
-#define SPI_LSB_FIRST 0x08
-#define SPI_3WIRE 0x10
-#define SPI_LOOP 0x20
-#define SPI_NO_CS 0x40
-#define SPI_READY 0x80
-#define SPI_TX_DUAL 0x100
-#define SPI_TX_QUAD 0x200
-#define SPI_RX_DUAL 0x400
-#define SPI_RX_QUAD 0x800
-#define SPI_CS_WORD 0x1000
-#define SPI_TX_OCTAL 0x2000
-#define SPI_RX_OCTAL 0x4000
-#define SPI_3WIRE_HIZ 0x8000
-
-/*---------------------------------------------------------------------------*/
+#include <linux/spi/spi.h>
/* IOCTL commands */
--
2.27.0
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