[PATCH v4 3/3] ARM: imx: Update spi_imx platform data to reflect current state
Trent Piepho
tpiepho at impinj.com
Mon Nov 6 11:46:18 PST 2017
The docs for the spi_imx platform data still refer to a -32 offset used to
specify a native chip select. This was removed in commit 602c8f4485cd
("spi: imx: fix use of native chip-selects with devicetree") and no
longer works as documented. Update documentation.
The macro MXC_SPI_CS() is no longer is needed.
If a board uses all native chip selects, then it's not necessary to
specify a chip select array at all, as all native is the default (this is
how device-tree configured SPI masters work too). Most of the spi-imx
platform data users have their chip select arrays removed by this patch.
This patch also fixes a bug in mx31moboard introduced in the '602 commit.
When that board was updated in commit 901f26bce64a ("ARM: imx: set
correct chip_select in platform setup") to reflect the SPI change, only
SPI bus 2 was updated and SPI bus 1 was left with non-sequential chip
selects. The mc13783 spi device on bus 1 had its chip select updated as
if it were on bus 2.
CC: Shawn Guo <shawnguo at kernel.org>
CC: Sascha Hauer <kernel at pengutronix.de>
CC: Fabio Estevam <fabio.estevam at nxp.com>
Acked-by: Greg Ungerer <gerg at linux-m68k.org>
Signed-off-by: Trent Piepho <tpiepho at impinj.com>
---
arch/arm/mach-imx/mach-mx31_3ds.c | 18 ++----------------
arch/arm/mach-imx/mach-mx31lilly.c | 12 ++----------
arch/arm/mach-imx/mach-mx31lite.c | 16 ++--------------
arch/arm/mach-imx/mach-mx31moboard.c | 17 +++--------------
arch/arm/mach-imx/mach-pcm037_eet.c | 5 +----
include/linux/platform_data/spi-imx.h | 29 +++++++++++++++++------------
6 files changed, 27 insertions(+), 70 deletions(-)
diff --git a/arch/arm/mach-imx/mach-mx31_3ds.c b/arch/arm/mach-imx/mach-mx31_3ds.c
index 68c3f0799d5b..9d87f1dcf7bb 100644
--- a/arch/arm/mach-imx/mach-mx31_3ds.c
+++ b/arch/arm/mach-imx/mach-mx31_3ds.c
@@ -374,26 +374,12 @@ static struct imx_ssi_platform_data mx31_3ds_ssi_pdata = {
};
/* SPI */
-static int spi0_internal_chipselect[] = {
- MXC_SPI_CS(0),
- MXC_SPI_CS(1),
- MXC_SPI_CS(2),
-};
-
static const struct spi_imx_master spi0_pdata __initconst = {
- .chipselect = spi0_internal_chipselect,
- .num_chipselect = ARRAY_SIZE(spi0_internal_chipselect),
-};
-
-static int spi1_internal_chipselect[] = {
- MXC_SPI_CS(0),
- MXC_SPI_CS(1),
- MXC_SPI_CS(2),
+ .num_chipselect = 3,
};
static const struct spi_imx_master spi1_pdata __initconst = {
- .chipselect = spi1_internal_chipselect,
- .num_chipselect = ARRAY_SIZE(spi1_internal_chipselect),
+ .num_chipselect = 3,
};
static struct spi_board_info mx31_3ds_spi_devs[] __initdata = {
diff --git a/arch/arm/mach-imx/mach-mx31lilly.c b/arch/arm/mach-imx/mach-mx31lilly.c
index 6fd463642954..8bf52819d4d9 100644
--- a/arch/arm/mach-imx/mach-mx31lilly.c
+++ b/arch/arm/mach-imx/mach-mx31lilly.c
@@ -226,20 +226,12 @@ static void __init lilly1131_usb_init(void)
/* SPI */
-static int spi_internal_chipselect[] = {
- MXC_SPI_CS(0),
- MXC_SPI_CS(1),
- MXC_SPI_CS(2),
-};
-
static const struct spi_imx_master spi0_pdata __initconst = {
- .chipselect = spi_internal_chipselect,
- .num_chipselect = ARRAY_SIZE(spi_internal_chipselect),
+ .num_chipselect = 3,
};
static const struct spi_imx_master spi1_pdata __initconst = {
- .chipselect = spi_internal_chipselect,
- .num_chipselect = ARRAY_SIZE(spi_internal_chipselect),
+ .num_chipselect = 3,
};
static struct mc13xxx_platform_data mc13783_pdata __initdata = {
diff --git a/arch/arm/mach-imx/mach-mx31lite.c b/arch/arm/mach-imx/mach-mx31lite.c
index f033a57d5694..fcbaf0070ccf 100644
--- a/arch/arm/mach-imx/mach-mx31lite.c
+++ b/arch/arm/mach-imx/mach-mx31lite.c
@@ -83,15 +83,8 @@ static const struct imxuart_platform_data uart_pdata __initconst = {
};
/* SPI */
-static int spi0_internal_chipselect[] = {
- MXC_SPI_CS(0),
- MXC_SPI_CS(1),
- MXC_SPI_CS(2),
-};
-
static const struct spi_imx_master spi0_pdata __initconst = {
- .chipselect = spi0_internal_chipselect,
- .num_chipselect = ARRAY_SIZE(spi0_internal_chipselect),
+ .num_chipselect = 3,
};
static const struct mxc_nand_platform_data
@@ -133,13 +126,8 @@ static struct platform_device smsc911x_device = {
* The MC13783 is the only hard-wired SPI device on the module.
*/
-static int spi1_internal_chipselect[] = {
- MXC_SPI_CS(0),
-};
-
static const struct spi_imx_master spi1_pdata __initconst = {
- .chipselect = spi1_internal_chipselect,
- .num_chipselect = ARRAY_SIZE(spi1_internal_chipselect),
+ .num_chipselect = 1,
};
static struct mc13xxx_platform_data mc13783_pdata __initdata = {
diff --git a/arch/arm/mach-imx/mach-mx31moboard.c b/arch/arm/mach-imx/mach-mx31moboard.c
index 7716f83aecdd..643a3d749703 100644
--- a/arch/arm/mach-imx/mach-mx31moboard.c
+++ b/arch/arm/mach-imx/mach-mx31moboard.c
@@ -152,14 +152,8 @@ static const struct imxi2c_platform_data moboard_i2c1_data __initconst = {
.bitrate = 100000,
};
-static int moboard_spi1_cs[] = {
- MXC_SPI_CS(0),
- MXC_SPI_CS(2),
-};
-
static const struct spi_imx_master moboard_spi1_pdata __initconst = {
- .chipselect = moboard_spi1_cs,
- .num_chipselect = ARRAY_SIZE(moboard_spi1_cs),
+ .num_chipselect = 3,
};
static struct regulator_consumer_supply sdhc_consumers[] = {
@@ -296,19 +290,14 @@ static struct spi_board_info moboard_spi_board_info[] __initdata = {
/* irq number is run-time assigned */
.max_speed_hz = 300000,
.bus_num = 1,
- .chip_select = 1,
+ .chip_select = 0,
.platform_data = &moboard_pmic,
.mode = SPI_CS_HIGH,
},
};
-static int moboard_spi2_cs[] = {
- MXC_SPI_CS(0), MXC_SPI_CS(1),
-};
-
static const struct spi_imx_master moboard_spi2_pdata __initconst = {
- .chipselect = moboard_spi2_cs,
- .num_chipselect = ARRAY_SIZE(moboard_spi2_cs),
+ .num_chipselect = 2,
};
#define SDHC1_CD IOMUX_TO_GPIO(MX31_PIN_ATA_CS0)
diff --git a/arch/arm/mach-imx/mach-pcm037_eet.c b/arch/arm/mach-imx/mach-pcm037_eet.c
index 95bd97710494..15bc956d466b 100644
--- a/arch/arm/mach-imx/mach-pcm037_eet.c
+++ b/arch/arm/mach-imx/mach-pcm037_eet.c
@@ -56,11 +56,8 @@ static struct spi_board_info pcm037_spi_dev[] = {
};
/* Platform Data for MXC CSPI */
-static int pcm037_spi1_cs[] = { MXC_SPI_CS(0), MXC_SPI_CS(1), };
-
static const struct spi_imx_master pcm037_spi1_pdata __initconst = {
- .chipselect = pcm037_spi1_cs,
- .num_chipselect = ARRAY_SIZE(pcm037_spi1_cs),
+ .num_chipselect = 2,
};
/* GPIO-keys input device */
diff --git a/include/linux/platform_data/spi-imx.h b/include/linux/platform_data/spi-imx.h
index 08be445e8eb8..9b2ed66ef7a2 100644
--- a/include/linux/platform_data/spi-imx.h
+++ b/include/linux/platform_data/spi-imx.h
@@ -4,24 +4,29 @@
/*
* struct spi_imx_master - device.platform_data for SPI controller devices.
- * @chipselect: Array of chipselects for this master. Numbers >= 0 mean gpio
- * pins, numbers < 0 mean internal CSPI chipselects according
- * to MXC_SPI_CS(). Normally you want to use gpio based chip
- * selects as the CSPI module tries to be intelligent about
- * when to assert the chipselect: The CSPI module deasserts the
- * chipselect once it runs out of input data. The other problem
- * is that it is not possible to mix between high active and low
- * active chipselects on one single bus using the internal
- * chipselects. Unfortunately Freescale decided to put some
+ * @chipselect: Array of chipselects for this master or NULL. Numbers >= 0
+ * mean GPIO pins, -ENOENT means internal CSPI chipselect
+ * matching the position in the array. E.g., if chipselect[1] =
+ * -ENOENT then a SPI slave using chip select 1 will use the
+ * native SS1 line of the CSPI. Omitting the array will use
+ * all native chip selects.
+
+ * Normally you want to use gpio based chip selects as the CSPI
+ * module tries to be intelligent about when to assert the
+ * chipselect: The CSPI module deasserts the chipselect once it
+ * runs out of input data. The other problem is that it is not
+ * possible to mix between high active and low active chipselects
+ * on one single bus using the internal chipselects.
+ * Unfortunately, on some SoCs, Freescale decided to put some
* chipselects on dedicated pins which are not usable as gpios,
* so we have to support the internal chipselects.
- * @num_chipselect: ARRAY_SIZE(chipselect)
+ *
+ * @num_chipselect: If @chipselect is specified, ARRAY_SIZE(chipselect),
+ * otherwise the number of native chip selects.
*/
struct spi_imx_master {
int *chipselect;
int num_chipselect;
};
-#define MXC_SPI_CS(no) ((no) - 32)
-
#endif /* __MACH_SPI_H_*/
--
2.14.3
More information about the linux-arm-kernel
mailing list