* [PATCH 0/7 v3] I2C GPIO to use gpiolibs open drain
@ 2017-10-05 11:03 Linus Walleij
2017-10-05 11:03 ` [PATCH 1/7 v3] i2c: gpio: Convert to use descriptors Linus Walleij
` (7 more replies)
0 siblings, 8 replies; 16+ messages in thread
From: Linus Walleij @ 2017-10-05 11:03 UTC (permalink / raw)
To: Wolfram Sang, linux-i2c; +Cc: Linus Walleij
Finalized this series and collected the ACKs.
Wolfram: if not too late for v4.15, please carry this series.
Geert Uytterhoeven (1):
dt-bindings: i2c: i2c-gpio: Add support for named gpios
Linus Walleij (6):
i2c: gpio: Convert to use descriptors
gpio: Make it possible for consumers to enforce open drain
i2c: gpio: Enforce open drain through gpiolib
i2c: gpio: Augment all boardfiles to use open drain
i2c: gpio: Local vars in probe
i2c: gpio: Add support for named gpios in DT
Documentation/devicetree/bindings/i2c/i2c-gpio.txt | 32 +++-
arch/arm/mach-ep93xx/core.c | 41 ++--
arch/arm/mach-ep93xx/edb93xx.c | 15 +-
arch/arm/mach-ep93xx/include/mach/platform.h | 4 +-
arch/arm/mach-ep93xx/simone.c | 12 +-
arch/arm/mach-ep93xx/snappercl15.c | 12 +-
arch/arm/mach-ep93xx/vision_ep9307.c | 7 +-
arch/arm/mach-ixp4xx/avila-setup.c | 17 +-
arch/arm/mach-ixp4xx/dsmg600-setup.c | 16 +-
arch/arm/mach-ixp4xx/fsg-setup.c | 16 +-
arch/arm/mach-ixp4xx/goramo_mlr.c | 24 +--
arch/arm/mach-ixp4xx/ixdp425-setup.c | 16 +-
arch/arm/mach-ixp4xx/nas100d-setup.c | 16 +-
arch/arm/mach-ixp4xx/nslu2-setup.c | 16 +-
arch/arm/mach-ks8695/board-acs5k.c | 15 +-
arch/arm/mach-pxa/palmz72.c | 14 +-
arch/arm/mach-pxa/viper.c | 27 ++-
arch/arm/mach-sa1100/simpad.c | 14 +-
arch/blackfin/mach-bf533/boards/blackstamp.c | 19 +-
arch/blackfin/mach-bf533/boards/ezkit.c | 18 +-
arch/blackfin/mach-bf533/boards/stamp.c | 18 +-
arch/blackfin/mach-bf561/boards/ezkit.c | 18 +-
arch/mips/alchemy/board-gpr.c | 23 ++-
arch/mips/ath79/mach-pb44.c | 16 +-
drivers/gpio/gpiolib.c | 13 ++
drivers/i2c/busses/i2c-gpio.c | 212 ++++++++++-----------
drivers/mfd/sm501.c | 49 ++---
include/linux/gpio/consumer.h | 6 +
include/linux/i2c-gpio.h | 4 -
29 files changed, 422 insertions(+), 288 deletions(-)
--
2.13.5
^ permalink raw reply [flat|nested] 16+ messages in thread
* [PATCH 1/7 v3] i2c: gpio: Convert to use descriptors
2017-10-05 11:03 [PATCH 0/7 v3] I2C GPIO to use gpiolibs open drain Linus Walleij
@ 2017-10-05 11:03 ` Linus Walleij
2017-10-05 11:03 ` [PATCH 2/7 v3] gpio: Make it possible for consumers to enforce open drain Linus Walleij
` (6 subsequent siblings)
7 siblings, 0 replies; 16+ messages in thread
From: Linus Walleij @ 2017-10-05 11:03 UTC (permalink / raw)
To: Wolfram Sang, linux-i2c
Cc: Linus Walleij, Steven Miao, Ralf Baechle, Guenter Roeck,
Ville Syrjälä,
Magnus Damm, Ben Dooks, Heiko Schocher
This converts the GPIO-based I2C-driver to using GPIO
descriptors instead of the old global numberspace-based
GPIO interface. We:
- Convert the driver to unconditionally grab two GPIOs
from the device by index 0 (SDA) and 1 (SCL) which
will work fine with device tree and descriptor tables.
The existing device trees will continue to work just
like before, but without any roundtrip through the
global numberspace.
- Brutally convert all boardfiles still passing global
GPIOs by registering descriptor tables associated with
the devices instead so this driver does not need to keep
supporting passing any GPIO numbers as platform data.
There is no stepwise approach as elegant as this, I
strongly prefer this big hammer over any antsteps for this
conversion. This way the old GPIO numbers go away and
NEVER COME BACK.
Special conversion for the different boards utilizing
I2C-GPIO:
- EP93xx (arch/arm/mach-ep93xx): pretty straight forward as
all boards were using the same two GPIO lines, just define
these two in a lookup table for "i2c-gpio" and register
these along with the device. None of them define any
other platform data so just pass NULL as platform data.
This platform selects GPIOLIB so all should be smooth.
The pins appear on a gpiochip for bank "G" as pins 1 (SDA)
and 0 (SCL).
- IXP4 (arch/arm/mach-ixp4): descriptor tables have to
be registered for each board separately. They all use
"IXP4XX_GPIO_CHIP" so it is pretty straight forward.
Most board define no other platform data than SCL/SDA
so they can drop the #include of <linux/i2c-gpio.h> and
assign NULL to platform data.
The "goramo_mlr" (Goramo Multilink Router) board is a bit
worrisome: it implements its own I2C bit-banging in the
board file, and optionally registers an I2C serial port,
but claims the same GPIO lines for itself in the board file.
This is not going to work: there will be competition for the
GPIO lines, so delete the optional extra I2C bus instead, no
I2C devices are registered on it anyway, there are just hints
that it may contain an EEPROM that may be accessed from
userspace. This needs to be fixed up properly by the serial
clock using I2C emulation so drop a note in the code.
- KS8695 board acs5k (arch/arm/mach-ks8695/board-acs5.c)
has some platform data in addition to the pins so it needs to
be kept around sans GPIO lines. Its GPIO chip is named
"KS8695" and the arch selects GPIOLIB.
- PXA boards (arch/arm/mach-pxa/*) use some of the platform
data so it needs to be preserved here. The viper board even
registers two GPIO I2Cs. The gpiochip is named "gpio-pxa" and
the arch selects GPIOLIB.
- SA1100 Simpad (arch/arm/mach-sa1100/simpad.c) defines a GPIO
I2C bus, and the arch selects GPIOLIB.
- Blackfin boards (arch/blackfin/bf533 etc) for these I assume
their I2C GPIOs refer to the local gpiochip defined in
arch/blackfin/kernel/bfin_gpio.c names "BFIN-GPIO".
The arch selects GPIOLIB. The boards get spiked with
IF_ENABLED(I2C_GPIO) but that is a side effect of it
being like that already (I would just have Kconfig select
I2C_GPIO and get rid of them all.) I also delete any
platform data set to 0 as it will get that value anyway
from static declartions of platform data.
- The MIPS selects GPIOLIB and the Alchemy machine is using
two local GPIO chips, one of them has a GPIO I2C. We need
to adjust the local offset from the global number space here.
The ATH79 has a proper GPIO driver in drivers/gpio/gpio-ath79.c
and AFAICT the chip is named "ath79-gpio" and the PB44
PCF857x expander spawns from this on GPIO 1 and 0. The latter
board only use the platform data to specify pins so it can be
cut altogether after this.
- The MFD Silicon Motion SM501 is a special case. It dynamically
spawns an I2C bus off the MFD using sm501_create_subdev().
We use an approach to dynamically create a machine descriptor
table and attach this to the "SM501-LOW" or "SM501-HIGH"
gpiochip. We use chip-local offsets to grab the right lines.
We can get rid of two local static inline helpers as part
of this refactoring.
Cc: Steven Miao <realmz6@gmail.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Magnus Damm <magnus.damm@gmail.com>
Cc: Ben Dooks <ben.dooks@codethink.co.uk>
Cc: Heiko Schocher <hs@denx.de>
Acked-by: Olof Johansson <olof@lixom.net>
Acked-by: Lee Jones <lee.jones@linaro.org>
Tested-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
ChangeLog v2->v3:
- Rebase onto v4.14-rc1
- NOTE: this patch gives a false report from the 0day build
robot about macro expansion in arch/arm/mach-sa1100/simpad.c
but that is due to that macro code being ancient and in need
of shaping up, not because of this patch.
- Collected Lee's ACK
ChangeLog v1->v2:
- Fix a minor typo in error path (scl was sda from copy-paste)
- Collected Olof's ACK
Steven (Blackfin): requesting ACK for Wolfram to take this patch.
Ralf (MIPS): requesting ACK for Wolfram to take this patch.
Lee: requesting ACK for Wolfram to take this patch.
SM501 users: requesting Tested-by on this patch.
---
arch/arm/mach-ep93xx/core.c | 39 ++++----
arch/arm/mach-ep93xx/edb93xx.c | 15 +--
arch/arm/mach-ep93xx/include/mach/platform.h | 4 +-
arch/arm/mach-ep93xx/simone.c | 12 +--
arch/arm/mach-ep93xx/snappercl15.c | 12 +--
arch/arm/mach-ep93xx/vision_ep9307.c | 7 +-
arch/arm/mach-ixp4xx/avila-setup.c | 17 +++-
arch/arm/mach-ixp4xx/dsmg600-setup.c | 16 +++-
arch/arm/mach-ixp4xx/fsg-setup.c | 16 +++-
arch/arm/mach-ixp4xx/goramo_mlr.c | 24 ++---
arch/arm/mach-ixp4xx/ixdp425-setup.c | 16 +++-
arch/arm/mach-ixp4xx/nas100d-setup.c | 16 +++-
arch/arm/mach-ixp4xx/nslu2-setup.c | 16 +++-
arch/arm/mach-ks8695/board-acs5k.c | 13 ++-
arch/arm/mach-pxa/palmz72.c | 12 ++-
arch/arm/mach-pxa/viper.c | 27 +++++-
arch/arm/mach-sa1100/simpad.c | 12 ++-
arch/blackfin/mach-bf533/boards/blackstamp.c | 19 +++-
arch/blackfin/mach-bf533/boards/ezkit.c | 18 +++-
arch/blackfin/mach-bf533/boards/stamp.c | 18 +++-
arch/blackfin/mach-bf561/boards/ezkit.c | 18 +++-
arch/mips/alchemy/board-gpr.c | 19 +++-
arch/mips/ath79/mach-pb44.c | 16 +++-
drivers/i2c/busses/i2c-gpio.c | 134 +++++++++++++--------------
drivers/mfd/sm501.c | 49 +++++-----
include/linux/i2c-gpio.h | 4 -
26 files changed, 327 insertions(+), 242 deletions(-)
diff --git a/arch/arm/mach-ep93xx/core.c b/arch/arm/mach-ep93xx/core.c
index f53c61813998..7e99fe829ad1 100644
--- a/arch/arm/mach-ep93xx/core.c
+++ b/arch/arm/mach-ep93xx/core.c
@@ -31,7 +31,7 @@
#include <linux/amba/serial.h>
#include <linux/mtd/physmap.h>
#include <linux/i2c.h>
-#include <linux/i2c-gpio.h>
+#include <linux/gpio/machine.h>
#include <linux/spi/spi.h>
#include <linux/export.h>
#include <linux/irqchip/arm-vic.h>
@@ -320,42 +320,45 @@ void __init ep93xx_register_eth(struct ep93xx_eth_data *data, int copy_addr)
/*************************************************************************
* EP93xx i2c peripheral handling
*************************************************************************/
-static struct i2c_gpio_platform_data ep93xx_i2c_data;
+
+/* All EP93xx devices use the same two GPIO pins for I2C bit-banging */
+static struct gpiod_lookup_table ep93xx_i2c_gpiod_table = {
+ .dev_id = "i2c-gpio",
+ .table = {
+ /* Use local offsets on gpiochip/port "G" */
+ GPIO_LOOKUP_IDX("G", 1, NULL, 0, GPIO_ACTIVE_HIGH),
+ GPIO_LOOKUP_IDX("G", 0, NULL, 1, GPIO_ACTIVE_HIGH),
+ },
+};
static struct platform_device ep93xx_i2c_device = {
.name = "i2c-gpio",
.id = 0,
.dev = {
- .platform_data = &ep93xx_i2c_data,
+ .platform_data = NULL,
},
};
/**
* ep93xx_register_i2c - Register the i2c platform device.
- * @data: platform specific i2c-gpio configuration (__initdata)
* @devices: platform specific i2c bus device information (__initdata)
* @num: the number of devices on the i2c bus
*/
-void __init ep93xx_register_i2c(struct i2c_gpio_platform_data *data,
- struct i2c_board_info *devices, int num)
+void __init ep93xx_register_i2c(struct i2c_board_info *devices, int num)
{
/*
- * Set the EEPROM interface pin drive type control.
- * Defines the driver type for the EECLK and EEDAT pins as either
- * open drain, which will require an external pull-up, or a normal
- * CMOS driver.
+ * FIXME: this just sets the two pins as non-opendrain, as no
+ * platforms tries to do that anyway. Flag the applicable lines
+ * as open drain in the GPIO_LOOKUP above and the driver or
+ * gpiolib will handle open drain/open drain emulation as need
+ * be. Right now i2c-gpio emulates open drain which is not
+ * optimal.
*/
- if (data->sda_is_open_drain && data->sda_pin != EP93XX_GPIO_LINE_EEDAT)
- pr_warning("sda != EEDAT, open drain has no effect\n");
- if (data->scl_is_open_drain && data->scl_pin != EP93XX_GPIO_LINE_EECLK)
- pr_warning("scl != EECLK, open drain has no effect\n");
-
- __raw_writel((data->sda_is_open_drain << 1) |
- (data->scl_is_open_drain << 0),
+ __raw_writel((0 << 1) | (0 << 0),
EP93XX_GPIO_EEDRIVE);
- ep93xx_i2c_data = *data;
i2c_register_board_info(0, devices, num);
+ gpiod_add_lookup_table(&ep93xx_i2c_gpiod_table);
platform_device_register(&ep93xx_i2c_device);
}
diff --git a/arch/arm/mach-ep93xx/edb93xx.c b/arch/arm/mach-ep93xx/edb93xx.c
index 7a7f280b07d7..8e89ec8b6f0f 100644
--- a/arch/arm/mach-ep93xx/edb93xx.c
+++ b/arch/arm/mach-ep93xx/edb93xx.c
@@ -28,7 +28,6 @@
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/i2c.h>
-#include <linux/i2c-gpio.h>
#include <linux/spi/spi.h>
#include <sound/cs4271.h>
@@ -61,14 +60,6 @@ static struct ep93xx_eth_data __initdata edb93xx_eth_data = {
/*************************************************************************
* EDB93xx i2c peripheral handling
*************************************************************************/
-static struct i2c_gpio_platform_data __initdata edb93xx_i2c_gpio_data = {
- .sda_pin = EP93XX_GPIO_LINE_EEDAT,
- .sda_is_open_drain = 0,
- .scl_pin = EP93XX_GPIO_LINE_EECLK,
- .scl_is_open_drain = 0,
- .udelay = 0, /* default to 100 kHz */
- .timeout = 0, /* default to 100 ms */
-};
static struct i2c_board_info __initdata edb93xxa_i2c_board_info[] = {
{
@@ -86,13 +77,11 @@ static void __init edb93xx_register_i2c(void)
{
if (machine_is_edb9302a() || machine_is_edb9307a() ||
machine_is_edb9315a()) {
- ep93xx_register_i2c(&edb93xx_i2c_gpio_data,
- edb93xxa_i2c_board_info,
+ ep93xx_register_i2c(edb93xxa_i2c_board_info,
ARRAY_SIZE(edb93xxa_i2c_board_info));
} else if (machine_is_edb9302() || machine_is_edb9307()
|| machine_is_edb9312() || machine_is_edb9315()) {
- ep93xx_register_i2c(&edb93xx_i2c_gpio_data,
- edb93xx_i2c_board_info,
+ ep93xx_register_i2c(edb93xx_i2c_board_info,
ARRAY_SIZE(edb93xx_i2c_board_info));
}
}
diff --git a/arch/arm/mach-ep93xx/include/mach/platform.h b/arch/arm/mach-ep93xx/include/mach/platform.h
index db0839691ef5..a686fd6caee1 100644
--- a/arch/arm/mach-ep93xx/include/mach/platform.h
+++ b/arch/arm/mach-ep93xx/include/mach/platform.h
@@ -7,7 +7,6 @@
#include <linux/reboot.h>
struct device;
-struct i2c_gpio_platform_data;
struct i2c_board_info;
struct spi_board_info;
struct platform_device;
@@ -36,8 +35,7 @@ void ep93xx_register_flash(unsigned int width,
resource_size_t start, resource_size_t size);
void ep93xx_register_eth(struct ep93xx_eth_data *data, int copy_addr);
-void ep93xx_register_i2c(struct i2c_gpio_platform_data *data,
- struct i2c_board_info *devices, int num);
+void ep93xx_register_i2c(struct i2c_board_info *devices, int num);
void ep93xx_register_spi(struct ep93xx_spi_info *info,
struct spi_board_info *devices, int num);
void ep93xx_register_fb(struct ep93xxfb_mach_info *data);
diff --git a/arch/arm/mach-ep93xx/simone.c b/arch/arm/mach-ep93xx/simone.c
index c7a40f245892..e61f3dee24c2 100644
--- a/arch/arm/mach-ep93xx/simone.c
+++ b/arch/arm/mach-ep93xx/simone.c
@@ -19,7 +19,6 @@
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/i2c.h>
-#include <linux/i2c-gpio.h>
#include <linux/mmc/host.h>
#include <linux/spi/spi.h>
#include <linux/spi/mmc_spi.h>
@@ -129,15 +128,6 @@ static struct ep93xx_spi_info simone_spi_info __initdata = {
.use_dma = 1,
};
-static struct i2c_gpio_platform_data __initdata simone_i2c_gpio_data = {
- .sda_pin = EP93XX_GPIO_LINE_EEDAT,
- .sda_is_open_drain = 0,
- .scl_pin = EP93XX_GPIO_LINE_EECLK,
- .scl_is_open_drain = 0,
- .udelay = 0,
- .timeout = 0,
-};
-
static struct i2c_board_info __initdata simone_i2c_board_info[] = {
{
I2C_BOARD_INFO("ds1337", 0x68),
@@ -161,7 +151,7 @@ static void __init simone_init_machine(void)
ep93xx_register_flash(2, EP93XX_CS6_PHYS_BASE, SZ_8M);
ep93xx_register_eth(&simone_eth_data, 1);
ep93xx_register_fb(&simone_fb_info);
- ep93xx_register_i2c(&simone_i2c_gpio_data, simone_i2c_board_info,
+ ep93xx_register_i2c(simone_i2c_board_info,
ARRAY_SIZE(simone_i2c_board_info));
ep93xx_register_spi(&simone_spi_info, simone_spi_devices,
ARRAY_SIZE(simone_spi_devices));
diff --git a/arch/arm/mach-ep93xx/snappercl15.c b/arch/arm/mach-ep93xx/snappercl15.c
index 8b29398f4dc7..45940c1d7787 100644
--- a/arch/arm/mach-ep93xx/snappercl15.c
+++ b/arch/arm/mach-ep93xx/snappercl15.c
@@ -21,7 +21,6 @@
#include <linux/init.h>
#include <linux/io.h>
#include <linux/i2c.h>
-#include <linux/i2c-gpio.h>
#include <linux/fb.h>
#include <linux/mtd/partitions.h>
@@ -127,15 +126,6 @@ static struct ep93xx_eth_data __initdata snappercl15_eth_data = {
.phy_id = 1,
};
-static struct i2c_gpio_platform_data __initdata snappercl15_i2c_gpio_data = {
- .sda_pin = EP93XX_GPIO_LINE_EEDAT,
- .sda_is_open_drain = 0,
- .scl_pin = EP93XX_GPIO_LINE_EECLK,
- .scl_is_open_drain = 0,
- .udelay = 0,
- .timeout = 0,
-};
-
static struct i2c_board_info __initdata snappercl15_i2c_data[] = {
{
/* Audio codec */
@@ -161,7 +151,7 @@ static void __init snappercl15_init_machine(void)
{
ep93xx_init_devices();
ep93xx_register_eth(&snappercl15_eth_data, 1);
- ep93xx_register_i2c(&snappercl15_i2c_gpio_data, snappercl15_i2c_data,
+ ep93xx_register_i2c(snappercl15_i2c_data,
ARRAY_SIZE(snappercl15_i2c_data));
ep93xx_register_fb(&snappercl15_fb_info);
snappercl15_register_audio();
diff --git a/arch/arm/mach-ep93xx/vision_ep9307.c b/arch/arm/mach-ep93xx/vision_ep9307.c
index 1daf9441058c..5a0b6187990a 100644
--- a/arch/arm/mach-ep93xx/vision_ep9307.c
+++ b/arch/arm/mach-ep93xx/vision_ep9307.c
@@ -22,7 +22,6 @@
#include <linux/io.h>
#include <linux/mtd/partitions.h>
#include <linux/i2c.h>
-#include <linux/i2c-gpio.h>
#include <linux/platform_data/pca953x.h>
#include <linux/spi/spi.h>
#include <linux/spi/flash.h>
@@ -144,10 +143,6 @@ static struct pca953x_platform_data pca953x_77_gpio_data = {
/*************************************************************************
* I2C Bus
*************************************************************************/
-static struct i2c_gpio_platform_data vision_i2c_gpio_data __initdata = {
- .sda_pin = EP93XX_GPIO_LINE_EEDAT,
- .scl_pin = EP93XX_GPIO_LINE_EECLK,
-};
static struct i2c_board_info vision_i2c_info[] __initdata = {
{
@@ -289,7 +284,7 @@ static void __init vision_init_machine(void)
vision_i2c_info[1].irq = gpio_to_irq(EP93XX_GPIO_LINE_F(7));
- ep93xx_register_i2c(&vision_i2c_gpio_data, vision_i2c_info,
+ ep93xx_register_i2c(vision_i2c_info,
ARRAY_SIZE(vision_i2c_info));
ep93xx_register_spi(&vision_spi_master, vision_spi_board_info,
ARRAY_SIZE(vision_spi_board_info));
diff --git a/arch/arm/mach-ixp4xx/avila-setup.c b/arch/arm/mach-ixp4xx/avila-setup.c
index 6beec150c060..72122b5e7f28 100644
--- a/arch/arm/mach-ixp4xx/avila-setup.c
+++ b/arch/arm/mach-ixp4xx/avila-setup.c
@@ -17,7 +17,7 @@
#include <linux/serial.h>
#include <linux/tty.h>
#include <linux/serial_8250.h>
-#include <linux/i2c-gpio.h>
+#include <linux/gpio/machine.h>
#include <asm/types.h>
#include <asm/setup.h>
#include <asm/memory.h>
@@ -49,16 +49,21 @@ static struct platform_device avila_flash = {
.resource = &avila_flash_resource,
};
-static struct i2c_gpio_platform_data avila_i2c_gpio_data = {
- .sda_pin = AVILA_SDA_PIN,
- .scl_pin = AVILA_SCL_PIN,
+static struct gpiod_lookup_table avila_i2c_gpiod_table = {
+ .dev_id = "i2c-gpio",
+ .table = {
+ GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", AVILA_SDA_PIN,
+ NULL, 0, GPIO_ACTIVE_HIGH),
+ GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", AVILA_SCL_PIN,
+ NULL, 1, GPIO_ACTIVE_HIGH),
+ },
};
static struct platform_device avila_i2c_gpio = {
.name = "i2c-gpio",
.id = 0,
.dev = {
- .platform_data = &avila_i2c_gpio_data,
+ .platform_data = NULL,
},
};
@@ -147,6 +152,8 @@ static void __init avila_init(void)
avila_flash_resource.end =
IXP4XX_EXP_BUS_BASE(0) + ixp4xx_exp_bus_size - 1;
+ gpiod_add_lookup_table(&avila_i2c_gpiod_table);
+
platform_add_devices(avila_devices, ARRAY_SIZE(avila_devices));
avila_pata_resources[0].start = IXP4XX_EXP_BUS_BASE(1);
diff --git a/arch/arm/mach-ixp4xx/dsmg600-setup.c b/arch/arm/mach-ixp4xx/dsmg600-setup.c
index b3bd0e137f6d..68ccd669051b 100644
--- a/arch/arm/mach-ixp4xx/dsmg600-setup.c
+++ b/arch/arm/mach-ixp4xx/dsmg600-setup.c
@@ -25,7 +25,7 @@
#include <linux/leds.h>
#include <linux/reboot.h>
#include <linux/i2c.h>
-#include <linux/i2c-gpio.h>
+#include <linux/gpio/machine.h>
#include <mach/hardware.h>
@@ -68,16 +68,21 @@ static struct platform_device dsmg600_flash = {
.resource = &dsmg600_flash_resource,
};
-static struct i2c_gpio_platform_data dsmg600_i2c_gpio_data = {
- .sda_pin = DSMG600_SDA_PIN,
- .scl_pin = DSMG600_SCL_PIN,
+static struct gpiod_lookup_table dsmg600_i2c_gpiod_table = {
+ .dev_id = "i2c-gpio",
+ .table = {
+ GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", DSMG600_SDA_PIN,
+ NULL, 0, GPIO_ACTIVE_HIGH),
+ GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", DSMG600_SCL_PIN,
+ NULL, 1, GPIO_ACTIVE_HIGH),
+ },
};
static struct platform_device dsmg600_i2c_gpio = {
.name = "i2c-gpio",
.id = 0,
.dev = {
- .platform_data = &dsmg600_i2c_gpio_data,
+ .platform_data = NULL,
},
};
@@ -269,6 +274,7 @@ static void __init dsmg600_init(void)
dsmg600_flash_resource.end =
IXP4XX_EXP_BUS_BASE(0) + ixp4xx_exp_bus_size - 1;
+ gpiod_add_lookup_table(&dsmg600_i2c_gpiod_table);
i2c_register_board_info(0, dsmg600_i2c_board_info,
ARRAY_SIZE(dsmg600_i2c_board_info));
diff --git a/arch/arm/mach-ixp4xx/fsg-setup.c b/arch/arm/mach-ixp4xx/fsg-setup.c
index 5c4b0c4a1b37..a0350ad15175 100644
--- a/arch/arm/mach-ixp4xx/fsg-setup.c
+++ b/arch/arm/mach-ixp4xx/fsg-setup.c
@@ -22,7 +22,7 @@
#include <linux/leds.h>
#include <linux/reboot.h>
#include <linux/i2c.h>
-#include <linux/i2c-gpio.h>
+#include <linux/gpio/machine.h>
#include <linux/io.h>
#include <asm/mach-types.h>
#include <asm/mach/arch.h>
@@ -54,16 +54,21 @@ static struct platform_device fsg_flash = {
.resource = &fsg_flash_resource,
};
-static struct i2c_gpio_platform_data fsg_i2c_gpio_data = {
- .sda_pin = FSG_SDA_PIN,
- .scl_pin = FSG_SCL_PIN,
+static struct gpiod_lookup_table fsg_i2c_gpiod_table = {
+ .dev_id = "i2c-gpio",
+ .table = {
+ GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", FSG_SDA_PIN,
+ NULL, 0, GPIO_ACTIVE_HIGH),
+ GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", FSG_SCL_PIN,
+ NULL, 1, GPIO_ACTIVE_HIGH),
+ },
};
static struct platform_device fsg_i2c_gpio = {
.name = "i2c-gpio",
.id = 0,
.dev = {
- .platform_data = &fsg_i2c_gpio_data,
+ .platform_data = NULL,
},
};
@@ -196,6 +201,7 @@ static void __init fsg_init(void)
/* Configure CS2 for operation, 8bit and writable */
*IXP4XX_EXP_CS2 = 0xbfff0002;
+ gpiod_add_lookup_table(&fsg_i2c_gpiod_table);
i2c_register_board_info(0, fsg_i2c_board_info,
ARRAY_SIZE(fsg_i2c_board_info));
diff --git a/arch/arm/mach-ixp4xx/goramo_mlr.c b/arch/arm/mach-ixp4xx/goramo_mlr.c
index 80bd9d6d04de..f1529aa3f8e2 100644
--- a/arch/arm/mach-ixp4xx/goramo_mlr.c
+++ b/arch/arm/mach-ixp4xx/goramo_mlr.c
@@ -6,7 +6,6 @@
#include <linux/delay.h>
#include <linux/gpio.h>
#include <linux/hdlc.h>
-#include <linux/i2c-gpio.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/kernel.h>
@@ -78,6 +77,12 @@
static u32 hw_bits = 0xFFFFFFFD; /* assume all hardware present */;
static u8 control_value;
+/*
+ * FIXME: this is reimplementing I2C bit-bangining. Move this
+ * over to using driver/i2c/busses/i2c-gpio.c like all other boards
+ * and register proper I2C device(s) on the bus for this. (See
+ * other IXP4xx boards for examples.)
+ */
static void set_scl(u8 value)
{
gpio_set_value(GPIO_SCL, !!value);
@@ -216,20 +221,6 @@ static struct platform_device device_flash = {
.resource = &flash_resource,
};
-
-/* I^2C interface */
-static struct i2c_gpio_platform_data i2c_data = {
- .sda_pin = GPIO_SDA,
- .scl_pin = GPIO_SCL,
-};
-
-static struct platform_device device_i2c = {
- .name = "i2c-gpio",
- .id = 0,
- .dev = { .platform_data = &i2c_data },
-};
-
-
/* IXP425 2 UART ports */
static struct resource uart_resources[] = {
{
@@ -411,9 +402,6 @@ static void __init gmlr_init(void)
if (hw_bits & CFG_HW_HAS_HSS1)
device_tab[devices++] = &device_hss_tab[1]; /* max index 5 */
- if (hw_bits & CFG_HW_HAS_EEPROM)
- device_tab[devices++] = &device_i2c; /* max index 6 */
-
gpio_request(GPIO_SCL, "SCL/clock");
gpio_request(GPIO_SDA, "SDA/data");
gpio_request(GPIO_STR, "strobe");
diff --git a/arch/arm/mach-ixp4xx/ixdp425-setup.c b/arch/arm/mach-ixp4xx/ixdp425-setup.c
index 93b89291c06b..8937263cec4a 100644
--- a/arch/arm/mach-ixp4xx/ixdp425-setup.c
+++ b/arch/arm/mach-ixp4xx/ixdp425-setup.c
@@ -14,7 +14,7 @@
#include <linux/serial.h>
#include <linux/tty.h>
#include <linux/serial_8250.h>
-#include <linux/i2c-gpio.h>
+#include <linux/gpio/machine.h>
#include <linux/io.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/rawnand.h>
@@ -122,16 +122,21 @@ static struct platform_device ixdp425_flash_nand = {
};
#endif /* CONFIG_MTD_NAND_PLATFORM */
-static struct i2c_gpio_platform_data ixdp425_i2c_gpio_data = {
- .sda_pin = IXDP425_SDA_PIN,
- .scl_pin = IXDP425_SCL_PIN,
+static struct gpiod_lookup_table ixdp425_i2c_gpiod_table = {
+ .dev_id = "i2c-gpio",
+ .table = {
+ GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", IXDP425_SDA_PIN,
+ NULL, 0, GPIO_ACTIVE_HIGH),
+ GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", IXDP425_SCL_PIN,
+ NULL, 1, GPIO_ACTIVE_HIGH),
+ },
};
static struct platform_device ixdp425_i2c_gpio = {
.name = "i2c-gpio",
.id = 0,
.dev = {
- .platform_data = &ixdp425_i2c_gpio_data,
+ .platform_data = NULL,
},
};
@@ -245,6 +250,7 @@ static void __init ixdp425_init(void)
ixdp425_uart_data[1].flags = 0;
}
+ gpiod_add_lookup_table(&ixdp425_i2c_gpiod_table);
platform_add_devices(ixdp425_devices, ARRAY_SIZE(ixdp425_devices));
}
diff --git a/arch/arm/mach-ixp4xx/nas100d-setup.c b/arch/arm/mach-ixp4xx/nas100d-setup.c
index 4e0f762bc651..612ec8c63456 100644
--- a/arch/arm/mach-ixp4xx/nas100d-setup.c
+++ b/arch/arm/mach-ixp4xx/nas100d-setup.c
@@ -27,7 +27,7 @@
#include <linux/leds.h>
#include <linux/reboot.h>
#include <linux/i2c.h>
-#include <linux/i2c-gpio.h>
+#include <linux/gpio/machine.h>
#include <linux/io.h>
#include <asm/mach-types.h>
#include <asm/mach/arch.h>
@@ -100,16 +100,21 @@ static struct platform_device nas100d_leds = {
.dev.platform_data = &nas100d_led_data,
};
-static struct i2c_gpio_platform_data nas100d_i2c_gpio_data = {
- .sda_pin = NAS100D_SDA_PIN,
- .scl_pin = NAS100D_SCL_PIN,
+static struct gpiod_lookup_table nas100d_i2c_gpiod_table = {
+ .dev_id = "i2c-gpio",
+ .table = {
+ GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", NAS100D_SDA_PIN,
+ NULL, 0, GPIO_ACTIVE_HIGH),
+ GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", NAS100D_SCL_PIN,
+ NULL, 1, GPIO_ACTIVE_HIGH),
+ },
};
static struct platform_device nas100d_i2c_gpio = {
.name = "i2c-gpio",
.id = 0,
.dev = {
- .platform_data = &nas100d_i2c_gpio_data,
+ .platform_data = NULL,
},
};
@@ -280,6 +285,7 @@ static void __init nas100d_init(void)
nas100d_flash_resource.end =
IXP4XX_EXP_BUS_BASE(0) + ixp4xx_exp_bus_size - 1;
+ gpiod_add_lookup_table(&nas100d_i2c_gpiod_table);
i2c_register_board_info(0, nas100d_i2c_board_info,
ARRAY_SIZE(nas100d_i2c_board_info));
diff --git a/arch/arm/mach-ixp4xx/nslu2-setup.c b/arch/arm/mach-ixp4xx/nslu2-setup.c
index 88c025f52d8d..13afb03b50fa 100644
--- a/arch/arm/mach-ixp4xx/nslu2-setup.c
+++ b/arch/arm/mach-ixp4xx/nslu2-setup.c
@@ -24,7 +24,7 @@
#include <linux/leds.h>
#include <linux/reboot.h>
#include <linux/i2c.h>
-#include <linux/i2c-gpio.h>
+#include <linux/gpio/machine.h>
#include <linux/io.h>
#include <asm/mach-types.h>
#include <asm/mach/arch.h>
@@ -68,9 +68,14 @@ static struct platform_device nslu2_flash = {
.resource = &nslu2_flash_resource,
};
-static struct i2c_gpio_platform_data nslu2_i2c_gpio_data = {
- .sda_pin = NSLU2_SDA_PIN,
- .scl_pin = NSLU2_SCL_PIN,
+static struct gpiod_lookup_table nslu2_i2c_gpiod_table = {
+ .dev_id = "i2c-gpio",
+ .table = {
+ GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", NSLU2_SDA_PIN,
+ NULL, 0, GPIO_ACTIVE_HIGH),
+ GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", NSLU2_SCL_PIN,
+ NULL, 1, GPIO_ACTIVE_HIGH),
+ },
};
static struct i2c_board_info __initdata nslu2_i2c_board_info [] = {
@@ -115,7 +120,7 @@ static struct platform_device nslu2_i2c_gpio = {
.name = "i2c-gpio",
.id = 0,
.dev = {
- .platform_data = &nslu2_i2c_gpio_data,
+ .platform_data = NULL,
},
};
@@ -250,6 +255,7 @@ static void __init nslu2_init(void)
nslu2_flash_resource.end =
IXP4XX_EXP_BUS_BASE(0) + ixp4xx_exp_bus_size - 1;
+ gpiod_add_lookup_table(&nslu2_i2c_gpiod_table);
i2c_register_board_info(0, nslu2_i2c_board_info,
ARRAY_SIZE(nslu2_i2c_board_info));
diff --git a/arch/arm/mach-ks8695/board-acs5k.c b/arch/arm/mach-ks8695/board-acs5k.c
index e4d709c8ed32..f034724e01e1 100644
--- a/arch/arm/mach-ks8695/board-acs5k.c
+++ b/arch/arm/mach-ks8695/board-acs5k.c
@@ -16,7 +16,7 @@
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/platform_device.h>
-
+#include <linux/gpio/machine.h>
#include <linux/i2c.h>
#include <linux/i2c-algo-bit.h>
#include <linux/i2c-gpio.h>
@@ -38,9 +38,15 @@
#include "generic.h"
+static struct gpiod_lookup_table acs5k_i2c_gpiod_table = {
+ .dev_id = "i2c-gpio",
+ .table = {
+ GPIO_LOOKUP_IDX("KS8695", 4, NULL, 0, GPIO_ACTIVE_HIGH),
+ GPIO_LOOKUP_IDX("KS8695", 5, NULL, 1, GPIO_ACTIVE_HIGH),
+ },
+};
+
static struct i2c_gpio_platform_data acs5k_i2c_device_platdata = {
- .sda_pin = 4,
- .scl_pin = 5,
.udelay = 10,
};
@@ -95,6 +101,7 @@ static struct i2c_board_info acs5k_i2c_devs[] __initdata = {
static void acs5k_i2c_init(void)
{
/* The gpio interface */
+ gpiod_add_lookup_table(&acs5k_i2c_gpiod_table);
platform_device_register(&acs5k_i2c_device);
/* I2C devices */
i2c_register_board_info(0, acs5k_i2c_devs,
diff --git a/arch/arm/mach-pxa/palmz72.c b/arch/arm/mach-pxa/palmz72.c
index 29630061e700..94f75632c007 100644
--- a/arch/arm/mach-pxa/palmz72.c
+++ b/arch/arm/mach-pxa/palmz72.c
@@ -31,6 +31,7 @@
#include <linux/power_supply.h>
#include <linux/usb/gpio_vbus.h>
#include <linux/i2c-gpio.h>
+#include <linux/gpio/machine.h>
#include <asm/mach-types.h>
#include <asm/suspend.h>
@@ -320,9 +321,15 @@ static struct soc_camera_link palmz72_iclink = {
.flags = SOCAM_DATAWIDTH_8,
};
+static struct gpiod_lookup_table palmz72_i2c_gpiod_table = {
+ .dev_id = "i2c-gpio",
+ .table = {
+ GPIO_LOOKUP_IDX("gpio-pxa", 118, NULL, 0, GPIO_ACTIVE_HIGH),
+ GPIO_LOOKUP_IDX("gpio-pxa", 117, NULL, 1, GPIO_ACTIVE_HIGH),
+ },
+};
+
static struct i2c_gpio_platform_data palmz72_i2c_bus_data = {
- .sda_pin = 118,
- .scl_pin = 117,
.udelay = 10,
.timeout = 100,
};
@@ -369,6 +376,7 @@ static void __init palmz72_camera_init(void)
{
palmz72_cam_gpio_init();
pxa_set_camera_info(&palmz72_pxacamera_platform_data);
+ gpiod_add_lookup_table(&palmz72_i2c_gpiod_table);
platform_device_register(&palmz72_i2c_bus_device);
platform_device_register(&palmz72_camera);
}
diff --git a/arch/arm/mach-pxa/viper.c b/arch/arm/mach-pxa/viper.c
index 8e89d91b206b..a680742bee2b 100644
--- a/arch/arm/mach-pxa/viper.c
+++ b/arch/arm/mach-pxa/viper.c
@@ -36,6 +36,7 @@
#include <linux/gpio.h>
#include <linux/jiffies.h>
#include <linux/i2c-gpio.h>
+#include <linux/gpio/machine.h>
#include <linux/i2c/pxa-i2c.h>
#include <linux/serial_8250.h>
#include <linux/smc91x.h>
@@ -458,9 +459,17 @@ static struct platform_device smc91x_device = {
};
/* i2c */
+static struct gpiod_lookup_table viper_i2c_gpiod_table = {
+ .dev_id = "i2c-gpio",
+ .table = {
+ GPIO_LOOKUP_IDX("gpio-pxa", VIPER_RTC_I2C_SDA_GPIO,
+ NULL, 0, GPIO_ACTIVE_HIGH),
+ GPIO_LOOKUP_IDX("gpio-pxa", VIPER_RTC_I2C_SCL_GPIO,
+ NULL, 1, GPIO_ACTIVE_HIGH),
+ },
+};
+
static struct i2c_gpio_platform_data i2c_bus_data = {
- .sda_pin = VIPER_RTC_I2C_SDA_GPIO,
- .scl_pin = VIPER_RTC_I2C_SCL_GPIO,
.udelay = 10,
.timeout = HZ,
};
@@ -779,12 +788,20 @@ static int __init viper_tpm_setup(char *str)
__setup("tpm=", viper_tpm_setup);
+struct gpiod_lookup_table viper_tpm_i2c_gpiod_table = {
+ .dev_id = "i2c-gpio",
+ .table = {
+ GPIO_LOOKUP_IDX("gpio-pxa", VIPER_TPM_I2C_SDA_GPIO,
+ NULL, 0, GPIO_ACTIVE_HIGH),
+ GPIO_LOOKUP_IDX("gpio-pxa", VIPER_TPM_I2C_SCL_GPIO,
+ NULL, 1, GPIO_ACTIVE_HIGH),
+ },
+};
+
static void __init viper_tpm_init(void)
{
struct platform_device *tpm_device;
struct i2c_gpio_platform_data i2c_tpm_data = {
- .sda_pin = VIPER_TPM_I2C_SDA_GPIO,
- .scl_pin = VIPER_TPM_I2C_SCL_GPIO,
.udelay = 10,
.timeout = HZ,
};
@@ -794,6 +811,7 @@ static void __init viper_tpm_init(void)
if (!viper_tpm)
return;
+ gpiod_add_lookup_table(&viper_tpm_i2c_gpiod_table);
tpm_device = platform_device_alloc("i2c-gpio", 2);
if (tpm_device) {
if (!platform_device_add_data(tpm_device,
@@ -943,6 +961,7 @@ static void __init viper_init(void)
smc91x_device.num_resources--;
pxa_set_i2c_info(NULL);
+ gpiod_add_lookup_table(&viper_i2c_gpiod_table);
pwm_add_table(viper_pwm_lookup, ARRAY_SIZE(viper_pwm_lookup));
platform_add_devices(viper_devs, ARRAY_SIZE(viper_devs));
diff --git a/arch/arm/mach-sa1100/simpad.c b/arch/arm/mach-sa1100/simpad.c
index bb3ca9c763de..c6e7e6d8733a 100644
--- a/arch/arm/mach-sa1100/simpad.c
+++ b/arch/arm/mach-sa1100/simpad.c
@@ -16,6 +16,7 @@
#include <linux/mtd/partitions.h>
#include <linux/io.h>
#include <linux/gpio/driver.h>
+#include <linux/gpio/machine.h>
#include <mach/hardware.h>
#include <asm/setup.h>
@@ -323,9 +324,15 @@ static struct platform_device simpad_gpio_leds = {
/*
* i2c
*/
+static struct gpiod_lookup_table simpad_i2c_gpiod_table = {
+ .dev_id = "i2c-gpio",
+ .table = {
+ GPIO_LOOKUP_IDX("gpio", GPIO_GPIO21, NULL, 0, GPIO_ACTIVE_HIGH),
+ GPIO_LOOKUP_IDX("gpio", GPIO_GPIO25, NULL, 1, GPIO_ACTIVE_HIGH),
+ },
+};
+
static struct i2c_gpio_platform_data simpad_i2c_data = {
- .sda_pin = GPIO_GPIO21,
- .scl_pin = GPIO_GPIO25,
.udelay = 10,
.timeout = HZ,
};
@@ -380,6 +387,7 @@ static int __init simpad_init(void)
ARRAY_SIZE(simpad_flash_resources));
sa11x0_register_mcp(&simpad_mcp_data);
+ gpiod_add_lookup_table(&simpad_i2c_gpiod_table);
ret = platform_add_devices(devices, ARRAY_SIZE(devices));
if(ret)
printk(KERN_WARNING "simpad: Unable to register mq200 framebuffer device");
diff --git a/arch/blackfin/mach-bf533/boards/blackstamp.c b/arch/blackfin/mach-bf533/boards/blackstamp.c
index 0ccf0cf4daaf..d801ca5ca6c4 100644
--- a/arch/blackfin/mach-bf533/boards/blackstamp.c
+++ b/arch/blackfin/mach-bf533/boards/blackstamp.c
@@ -22,6 +22,7 @@
#include <linux/irq.h>
#include <linux/gpio.h>
#include <linux/i2c.h>
+#include <linux/gpio/machine.h>
#include <asm/dma.h>
#include <asm/bfin5xx_spi.h>
#include <asm/portmux.h>
@@ -362,11 +363,17 @@ static struct platform_device bfin_device_gpiokeys = {
#if IS_ENABLED(CONFIG_I2C_GPIO)
#include <linux/i2c-gpio.h>
+static struct gpiod_lookup_table bfin_i2c_gpiod_table = {
+ .dev_id = "i2c-gpio",
+ .table = {
+ GPIO_LOOKUP_IDX("BFIN-GPIO", GPIO_PF8, NULL, 0,
+ GPIO_ACTIVE_HIGH),
+ GPIO_LOOKUP_IDX("BFIN-GPIO", GPIO_PF9, NULL, 1,
+ GPIO_ACTIVE_HIGH),
+ },
+};
+
static struct i2c_gpio_platform_data i2c_gpio_data = {
- .sda_pin = GPIO_PF8,
- .scl_pin = GPIO_PF9,
- .sda_is_open_drain = 0,
- .scl_is_open_drain = 0,
.udelay = 40,
}; /* This hasn't actually been used these pins
* are (currently) free pins on the expansion connector */
@@ -462,7 +469,9 @@ static int __init blackstamp_init(void)
int ret;
printk(KERN_INFO "%s(): registering device resources\n", __func__);
-
+#if IS_ENABLED(CONFIG_I2C_GPIO)
+ gpiod_add_lookup_table(&bfin_i2c_gpiod_table);
+#endif
i2c_register_board_info(0, bfin_i2c_board_info,
ARRAY_SIZE(bfin_i2c_board_info));
diff --git a/arch/blackfin/mach-bf533/boards/ezkit.c b/arch/blackfin/mach-bf533/boards/ezkit.c
index 3625e9eaa8a8..463a72358b0e 100644
--- a/arch/blackfin/mach-bf533/boards/ezkit.c
+++ b/arch/blackfin/mach-bf533/boards/ezkit.c
@@ -19,6 +19,7 @@
#endif
#include <linux/irq.h>
#include <linux/i2c.h>
+#include <linux/gpio/machine.h>
#include <asm/dma.h>
#include <asm/bfin5xx_spi.h>
#include <asm/portmux.h>
@@ -390,11 +391,17 @@ static struct platform_device bfin_device_gpiokeys = {
#if IS_ENABLED(CONFIG_I2C_GPIO)
#include <linux/i2c-gpio.h>
+static struct gpiod_lookup_table bfin_i2c_gpiod_table = {
+ .dev_id = "i2c-gpio",
+ .table = {
+ GPIO_LOOKUP_IDX("BFIN-GPIO", GPIO_PF1, NULL, 0,
+ GPIO_ACTIVE_HIGH),
+ GPIO_LOOKUP_IDX("BFIN-GPIO", GPIO_PF0, NULL, 1,
+ GPIO_ACTIVE_HIGH),
+ },
+};
+
static struct i2c_gpio_platform_data i2c_gpio_data = {
- .sda_pin = GPIO_PF1,
- .scl_pin = GPIO_PF0,
- .sda_is_open_drain = 0,
- .scl_is_open_drain = 0,
.udelay = 40,
};
@@ -516,6 +523,9 @@ static struct platform_device *ezkit_devices[] __initdata = {
static int __init ezkit_init(void)
{
printk(KERN_INFO "%s(): registering device resources\n", __func__);
+#if IS_ENABLED(CONFIG_I2C_GPIO)
+ gpiod_add_lookup_table(&bfin_i2c_gpiod_table);
+#endif
platform_add_devices(ezkit_devices, ARRAY_SIZE(ezkit_devices));
spi_register_board_info(bfin_spi_board_info, ARRAY_SIZE(bfin_spi_board_info));
i2c_register_board_info(0, bfin_i2c_board_info,
diff --git a/arch/blackfin/mach-bf533/boards/stamp.c b/arch/blackfin/mach-bf533/boards/stamp.c
index 23eada79439c..d2479359adb7 100644
--- a/arch/blackfin/mach-bf533/boards/stamp.c
+++ b/arch/blackfin/mach-bf533/boards/stamp.c
@@ -21,6 +21,7 @@
#include <linux/gpio.h>
#include <linux/irq.h>
#include <linux/i2c.h>
+#include <linux/gpio/machine.h>
#include <asm/dma.h>
#include <asm/bfin5xx_spi.h>
#include <asm/reboot.h>
@@ -512,11 +513,17 @@ static struct platform_device bfin_device_gpiokeys = {
#if IS_ENABLED(CONFIG_I2C_GPIO)
#include <linux/i2c-gpio.h>
+static struct gpiod_lookup_table bfin_i2c_gpiod_table = {
+ .dev_id = "i2c-gpio",
+ .table = {
+ GPIO_LOOKUP_IDX("BFIN-GPIO", GPIO_PF2, NULL, 0,
+ GPIO_ACTIVE_HIGH),
+ GPIO_LOOKUP_IDX("BFIN-GPIO", GPIO_PF3, NULL, 1,
+ GPIO_ACTIVE_HIGH),
+ },
+};
+
static struct i2c_gpio_platform_data i2c_gpio_data = {
- .sda_pin = GPIO_PF2,
- .scl_pin = GPIO_PF3,
- .sda_is_open_drain = 0,
- .scl_is_open_drain = 0,
.udelay = 10,
};
@@ -848,6 +855,9 @@ static int __init stamp_init(void)
printk(KERN_INFO "%s(): registering device resources\n", __func__);
+#if IS_ENABLED(CONFIG_I2C_GPIO)
+ gpiod_add_lookup_table(&bfin_i2c_gpiod_table);
+#endif
i2c_register_board_info(0, bfin_i2c_board_info,
ARRAY_SIZE(bfin_i2c_board_info));
diff --git a/arch/blackfin/mach-bf561/boards/ezkit.c b/arch/blackfin/mach-bf561/boards/ezkit.c
index 57d1c43726d9..72f757ebaa84 100644
--- a/arch/blackfin/mach-bf561/boards/ezkit.c
+++ b/arch/blackfin/mach-bf561/boards/ezkit.c
@@ -16,6 +16,7 @@
#include <linux/interrupt.h>
#include <linux/gpio.h>
#include <linux/delay.h>
+#include <linux/gpio/machine.h>
#include <asm/dma.h>
#include <asm/bfin5xx_spi.h>
#include <asm/portmux.h>
@@ -379,11 +380,17 @@ static struct platform_device bfin_device_gpiokeys = {
#if IS_ENABLED(CONFIG_I2C_GPIO)
#include <linux/i2c-gpio.h>
+static struct gpiod_lookup_table bfin_i2c_gpiod_table = {
+ .dev_id = "i2c-gpio",
+ .table = {
+ GPIO_LOOKUP_IDX("BFIN-GPIO", GPIO_PF1, NULL, 0,
+ GPIO_ACTIVE_HIGH),
+ GPIO_LOOKUP_IDX("BFIN-GPIO", GPIO_PF0, NULL, 1,
+ GPIO_ACTIVE_HIGH),
+ },
+};
+
static struct i2c_gpio_platform_data i2c_gpio_data = {
- .sda_pin = GPIO_PF1,
- .scl_pin = GPIO_PF0,
- .sda_is_open_drain = 0,
- .scl_is_open_drain = 0,
.udelay = 10,
};
@@ -633,6 +640,9 @@ static int __init ezkit_init(void)
printk(KERN_INFO "%s(): registering device resources\n", __func__);
+#if IS_ENABLED(CONFIG_I2C_GPIO)
+ gpiod_add_lookup_table(&bfin_i2c_gpiod_table);
+#endif
ret = platform_add_devices(ezkit_devices, ARRAY_SIZE(ezkit_devices));
if (ret < 0)
return ret;
diff --git a/arch/mips/alchemy/board-gpr.c b/arch/mips/alchemy/board-gpr.c
index 6fb6b3faa158..daebc36e5ecb 100644
--- a/arch/mips/alchemy/board-gpr.c
+++ b/arch/mips/alchemy/board-gpr.c
@@ -30,6 +30,7 @@
#include <linux/gpio.h>
#include <linux/i2c.h>
#include <linux/i2c-gpio.h>
+#include <linux/gpio/machine.h>
#include <asm/bootinfo.h>
#include <asm/idle.h>
#include <asm/reboot.h>
@@ -218,10 +219,23 @@ static struct platform_device gpr_led_devices = {
/*
* I2C
*/
+static struct gpiod_lookup_table gpr_i2c_gpiod_table = {
+ .dev_id = "i2c-gpio",
+ .table = {
+ /*
+ * This should be on "GPIO2" which has base at 200 so
+ * the global numbers 209 and 210 should correspond to
+ * local offsets 9 and 10.
+ */
+ GPIO_LOOKUP_IDX("alchemy-gpio2", 9, NULL, 0,
+ GPIO_ACTIVE_HIGH),
+ GPIO_LOOKUP_IDX("alchemy-gpio2", 10, NULL, 1,
+ GPIO_ACTIVE_HIGH),
+ },
+};
+
static struct i2c_gpio_platform_data gpr_i2c_data = {
- .sda_pin = 209,
.sda_is_open_drain = 1,
- .scl_pin = 210,
.scl_is_open_drain = 1,
.udelay = 2, /* ~100 kHz */
.timeout = HZ,
@@ -295,6 +309,7 @@ arch_initcall(gpr_pci_init);
static int __init gpr_dev_init(void)
{
+ gpiod_add_lookup_table(&gpr_i2c_gpiod_table);
i2c_register_board_info(0, gpr_i2c_info, ARRAY_SIZE(gpr_i2c_info));
return platform_add_devices(gpr_devices, ARRAY_SIZE(gpr_devices));
diff --git a/arch/mips/ath79/mach-pb44.c b/arch/mips/ath79/mach-pb44.c
index be78298dffb4..a95409063847 100644
--- a/arch/mips/ath79/mach-pb44.c
+++ b/arch/mips/ath79/mach-pb44.c
@@ -11,7 +11,7 @@
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/i2c.h>
-#include <linux/i2c-gpio.h>
+#include <linux/gpio/machine.h>
#include <linux/platform_data/pcf857x.h>
#include "machtypes.h"
@@ -33,16 +33,21 @@
#define PB44_KEYS_POLL_INTERVAL 20 /* msecs */
#define PB44_KEYS_DEBOUNCE_INTERVAL (3 * PB44_KEYS_POLL_INTERVAL)
-static struct i2c_gpio_platform_data pb44_i2c_gpio_data = {
- .sda_pin = PB44_GPIO_I2C_SDA,
- .scl_pin = PB44_GPIO_I2C_SCL,
+static struct gpiod_lookup_table pb44_i2c_gpiod_table = {
+ .dev_id = "i2c-gpio",
+ .table = {
+ GPIO_LOOKUP_IDX("ath79-gpio", PB44_GPIO_I2C_SDA,
+ NULL, 0, GPIO_ACTIVE_HIGH),
+ GPIO_LOOKUP_IDX("ath79-gpio", PB44_GPIO_I2C_SCL,
+ NULL, 1, GPIO_ACTIVE_HIGH),
+ },
};
static struct platform_device pb44_i2c_gpio_device = {
.name = "i2c-gpio",
.id = 0,
.dev = {
- .platform_data = &pb44_i2c_gpio_data,
+ .platform_data = NULL,
}
};
@@ -103,6 +108,7 @@ static struct ath79_spi_platform_data pb44_spi_data = {
static void __init pb44_init(void)
{
+ gpiod_add_lookup_table(&pb44_i2c_gpiod_table);
i2c_register_board_info(0, pb44_i2c_board_info,
ARRAY_SIZE(pb44_i2c_board_info));
platform_device_register(&pb44_i2c_gpio_device);
diff --git a/drivers/i2c/busses/i2c-gpio.c b/drivers/i2c/busses/i2c-gpio.c
index 0ef8fcc6ac3a..b4664037eded 100644
--- a/drivers/i2c/busses/i2c-gpio.c
+++ b/drivers/i2c/busses/i2c-gpio.c
@@ -14,11 +14,12 @@
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
-#include <linux/gpio.h>
+#include <linux/gpio/consumer.h>
#include <linux/of.h>
-#include <linux/of_gpio.h>
struct i2c_gpio_private_data {
+ struct gpio_desc *sda;
+ struct gpio_desc *scl;
struct i2c_adapter adap;
struct i2c_algo_bit_data bit_data;
struct i2c_gpio_platform_data pdata;
@@ -27,12 +28,18 @@ struct i2c_gpio_private_data {
/* Toggle SDA by changing the direction of the pin */
static void i2c_gpio_setsda_dir(void *data, int state)
{
- struct i2c_gpio_platform_data *pdata = data;
-
+ struct i2c_gpio_private_data *priv = data;
+
+ /*
+ * This is a way of saying "do not drive
+ * me actively high" which means emulating open drain.
+ * The right way to do this is for gpiolib to
+ * handle this, by the function below.
+ */
if (state)
- gpio_direction_input(pdata->sda_pin);
+ gpiod_direction_input(priv->sda);
else
- gpio_direction_output(pdata->sda_pin, 0);
+ gpiod_direction_output(priv->sda, 0);
}
/*
@@ -42,20 +49,20 @@ static void i2c_gpio_setsda_dir(void *data, int state)
*/
static void i2c_gpio_setsda_val(void *data, int state)
{
- struct i2c_gpio_platform_data *pdata = data;
+ struct i2c_gpio_private_data *priv = data;
- gpio_set_value(pdata->sda_pin, state);
+ gpiod_set_value(priv->sda, state);
}
/* Toggle SCL by changing the direction of the pin. */
static void i2c_gpio_setscl_dir(void *data, int state)
{
- struct i2c_gpio_platform_data *pdata = data;
+ struct i2c_gpio_private_data *priv = data;
if (state)
- gpio_direction_input(pdata->scl_pin);
+ gpiod_direction_input(priv->scl);
else
- gpio_direction_output(pdata->scl_pin, 0);
+ gpiod_direction_output(priv->scl, 0);
}
/*
@@ -66,44 +73,23 @@ static void i2c_gpio_setscl_dir(void *data, int state)
*/
static void i2c_gpio_setscl_val(void *data, int state)
{
- struct i2c_gpio_platform_data *pdata = data;
+ struct i2c_gpio_private_data *priv = data;
- gpio_set_value(pdata->scl_pin, state);
+ gpiod_set_value(priv->scl, state);
}
static int i2c_gpio_getsda(void *data)
{
- struct i2c_gpio_platform_data *pdata = data;
+ struct i2c_gpio_private_data *priv = data;
- return gpio_get_value(pdata->sda_pin);
+ return gpiod_get_value(priv->sda);
}
static int i2c_gpio_getscl(void *data)
{
- struct i2c_gpio_platform_data *pdata = data;
+ struct i2c_gpio_private_data *priv = data;
- return gpio_get_value(pdata->scl_pin);
-}
-
-static int of_i2c_gpio_get_pins(struct device_node *np,
- unsigned int *sda_pin, unsigned int *scl_pin)
-{
- if (of_gpio_count(np) < 2)
- return -ENODEV;
-
- *sda_pin = of_get_gpio(np, 0);
- *scl_pin = of_get_gpio(np, 1);
-
- if (*sda_pin == -EPROBE_DEFER || *scl_pin == -EPROBE_DEFER)
- return -EPROBE_DEFER;
-
- if (!gpio_is_valid(*sda_pin) || !gpio_is_valid(*scl_pin)) {
- pr_err("%pOF: invalid GPIO pins, sda=%d/scl=%d\n",
- np, *sda_pin, *scl_pin);
- return -ENODEV;
- }
-
- return 0;
+ return gpiod_get_value(priv->scl);
}
static void of_i2c_gpio_get_props(struct device_node *np,
@@ -130,64 +116,65 @@ static int i2c_gpio_probe(struct platform_device *pdev)
struct i2c_gpio_platform_data *pdata;
struct i2c_algo_bit_data *bit_data;
struct i2c_adapter *adap;
- unsigned int sda_pin, scl_pin;
int ret;
- /* First get the GPIO pins; if it fails, we'll defer the probe. */
- if (pdev->dev.of_node) {
- ret = of_i2c_gpio_get_pins(pdev->dev.of_node,
- &sda_pin, &scl_pin);
- if (ret)
- return ret;
- } else {
- if (!dev_get_platdata(&pdev->dev))
- return -ENXIO;
- pdata = dev_get_platdata(&pdev->dev);
- sda_pin = pdata->sda_pin;
- scl_pin = pdata->scl_pin;
- }
+ priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
- ret = devm_gpio_request(&pdev->dev, sda_pin, "sda");
- if (ret) {
+ /* First get the GPIO pins; if it fails, we'll defer the probe. */
+ priv->sda = devm_gpiod_get_index(&pdev->dev, NULL, 0, GPIOD_OUT_HIGH);
+ if (IS_ERR(priv->sda)) {
+ ret = PTR_ERR(priv->sda);
+ /* FIXME: hack in the old code, is this really necessary? */
if (ret == -EINVAL)
- ret = -EPROBE_DEFER; /* Try again later */
+ ret = -EPROBE_DEFER;
return ret;
}
- ret = devm_gpio_request(&pdev->dev, scl_pin, "scl");
- if (ret) {
+ priv->scl = devm_gpiod_get_index(&pdev->dev, NULL, 1, GPIOD_OUT_LOW);
+ if (IS_ERR(priv->scl)) {
+ ret = PTR_ERR(priv->scl);
+ /* FIXME: hack in the old code, is this really necessary? */
if (ret == -EINVAL)
- ret = -EPROBE_DEFER; /* Try again later */
+ ret = -EPROBE_DEFER;
return ret;
}
- priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
- if (!priv)
- return -ENOMEM;
adap = &priv->adap;
bit_data = &priv->bit_data;
pdata = &priv->pdata;
if (pdev->dev.of_node) {
- pdata->sda_pin = sda_pin;
- pdata->scl_pin = scl_pin;
of_i2c_gpio_get_props(pdev->dev.of_node, pdata);
} else {
- memcpy(pdata, dev_get_platdata(&pdev->dev), sizeof(*pdata));
+ /*
+ * If all platform data settings are zero it is OK
+ * to not provide any platform data from the board.
+ */
+ if (dev_get_platdata(&pdev->dev))
+ memcpy(pdata, dev_get_platdata(&pdev->dev),
+ sizeof(*pdata));
}
+ /*
+ * FIXME: this is a hack emulating the open drain emulation
+ * that gpiolib can already do for us. Make all clients properly
+ * flag their lines as open drain and get rid of this property
+ * and the special callback.
+ */
if (pdata->sda_is_open_drain) {
- gpio_direction_output(pdata->sda_pin, 1);
+ gpiod_direction_output(priv->sda, 1);
bit_data->setsda = i2c_gpio_setsda_val;
} else {
- gpio_direction_input(pdata->sda_pin);
+ gpiod_direction_input(priv->sda);
bit_data->setsda = i2c_gpio_setsda_dir;
}
if (pdata->scl_is_open_drain || pdata->scl_is_output_only) {
- gpio_direction_output(pdata->scl_pin, 1);
+ gpiod_direction_output(priv->scl, 1);
bit_data->setscl = i2c_gpio_setscl_val;
} else {
- gpio_direction_input(pdata->scl_pin);
+ gpiod_direction_input(priv->scl);
bit_data->setscl = i2c_gpio_setscl_dir;
}
@@ -207,7 +194,7 @@ static int i2c_gpio_probe(struct platform_device *pdev)
else
bit_data->timeout = HZ / 10; /* 100 ms */
- bit_data->data = pdata;
+ bit_data->data = priv;
adap->owner = THIS_MODULE;
if (pdev->dev.of_node)
@@ -227,8 +214,13 @@ static int i2c_gpio_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, priv);
- dev_info(&pdev->dev, "using pins %u (SDA) and %u (SCL%s)\n",
- pdata->sda_pin, pdata->scl_pin,
+ /*
+ * FIXME: using global GPIO numbers is not helpful. If/when we
+ * get accessors to get the actual name of the GPIO line,
+ * from the descriptor, then provide that instead.
+ */
+ dev_info(&pdev->dev, "using lines %u (SDA) and %u (SCL%s)\n",
+ desc_to_gpio(priv->sda), desc_to_gpio(priv->scl),
pdata->scl_is_output_only
? ", no clock stretching" : "");
diff --git a/drivers/mfd/sm501.c b/drivers/mfd/sm501.c
index 40534352e574..4d40d013a412 100644
--- a/drivers/mfd/sm501.c
+++ b/drivers/mfd/sm501.c
@@ -20,6 +20,7 @@
#include <linux/platform_device.h>
#include <linux/pci.h>
#include <linux/i2c-gpio.h>
+#include <linux/gpio/machine.h>
#include <linux/slab.h>
#include <linux/sm501.h>
@@ -1107,14 +1108,6 @@ static void sm501_gpio_remove(struct sm501_devdata *sm)
kfree(gpio->regs_res);
}
-static inline int sm501_gpio_pin2nr(struct sm501_devdata *sm, unsigned int pin)
-{
- struct sm501_gpio *gpio = &sm->gpio;
- int base = (pin < 32) ? gpio->low.gpio.base : gpio->high.gpio.base;
-
- return (pin % 32) + base;
-}
-
static inline int sm501_gpio_isregistered(struct sm501_devdata *sm)
{
return sm->gpio.registered;
@@ -1129,11 +1122,6 @@ static inline void sm501_gpio_remove(struct sm501_devdata *sm)
{
}
-static inline int sm501_gpio_pin2nr(struct sm501_devdata *sm, unsigned int pin)
-{
- return -1;
-}
-
static inline int sm501_gpio_isregistered(struct sm501_devdata *sm)
{
return 0;
@@ -1145,20 +1133,37 @@ static int sm501_register_gpio_i2c_instance(struct sm501_devdata *sm,
{
struct i2c_gpio_platform_data *icd;
struct platform_device *pdev;
+ struct gpiod_lookup_table *lookup;
pdev = sm501_create_subdev(sm, "i2c-gpio", 0,
sizeof(struct i2c_gpio_platform_data));
if (!pdev)
return -ENOMEM;
- icd = dev_get_platdata(&pdev->dev);
-
- /* We keep the pin_sda and pin_scl fields relative in case the
- * same platform data is passed to >1 SM501.
- */
+ /* Create a gpiod lookup using gpiochip-local offsets */
+ lookup = devm_kzalloc(&pdev->dev,
+ sizeof(*lookup) + 3 * sizeof(struct gpiod_lookup),
+ GFP_KERNEL);
+ lookup->dev_id = "i2c-gpio";
+ if (iic->pin_sda < 32)
+ lookup->table[0].chip_label = "SM501-LOW";
+ else
+ lookup->table[0].chip_label = "SM501-HIGH";
+ lookup->table[0].chip_hwnum = iic->pin_sda % 32;
+ lookup->table[0].con_id = NULL;
+ lookup->table[0].idx = 0;
+ lookup->table[0].flags = GPIO_ACTIVE_HIGH;
+ if (iic->pin_scl < 32)
+ lookup->table[1].chip_label = "SM501-LOW";
+ else
+ lookup->table[1].chip_label = "SM501-HIGH";
+ lookup->table[1].chip_hwnum = iic->pin_scl % 32;
+ lookup->table[1].con_id = NULL;
+ lookup->table[1].idx = 1;
+ lookup->table[1].flags = GPIO_ACTIVE_HIGH;
+ gpiod_add_lookup_table(lookup);
- icd->sda_pin = sm501_gpio_pin2nr(sm, iic->pin_sda);
- icd->scl_pin = sm501_gpio_pin2nr(sm, iic->pin_scl);
+ icd = dev_get_platdata(&pdev->dev);
icd->timeout = iic->timeout;
icd->udelay = iic->udelay;
@@ -1170,9 +1175,9 @@ static int sm501_register_gpio_i2c_instance(struct sm501_devdata *sm,
pdev->id = iic->bus_num;
- dev_info(sm->dev, "registering i2c-%d: sda=%d (%d), scl=%d (%d)\n",
+ dev_info(sm->dev, "registering i2c-%d: sda=%d, scl=%d\n",
iic->bus_num,
- icd->sda_pin, iic->pin_sda, icd->scl_pin, iic->pin_scl);
+ iic->pin_sda, iic->pin_scl);
return sm501_register_device(sm, pdev);
}
diff --git a/include/linux/i2c-gpio.h b/include/linux/i2c-gpio.h
index c1bcb1f1d73b..352c1426fd4d 100644
--- a/include/linux/i2c-gpio.h
+++ b/include/linux/i2c-gpio.h
@@ -12,8 +12,6 @@
/**
* struct i2c_gpio_platform_data - Platform-dependent data for i2c-gpio
- * @sda_pin: GPIO pin ID to use for SDA
- * @scl_pin: GPIO pin ID to use for SCL
* @udelay: signal toggle delay. SCL frequency is (500 / udelay) kHz
* @timeout: clock stretching timeout in jiffies. If the slave keeps
* SCL low for longer than this, the transfer will time out.
@@ -26,8 +24,6 @@
* @scl_is_output_only: SCL output drivers cannot be turned off.
*/
struct i2c_gpio_platform_data {
- unsigned int sda_pin;
- unsigned int scl_pin;
int udelay;
int timeout;
unsigned int sda_is_open_drain:1;
--
2.13.5
^ permalink raw reply related [flat|nested] 16+ messages in thread
* [PATCH 2/7 v3] gpio: Make it possible for consumers to enforce open drain
2017-10-05 11:03 [PATCH 0/7 v3] I2C GPIO to use gpiolibs open drain Linus Walleij
2017-10-05 11:03 ` [PATCH 1/7 v3] i2c: gpio: Convert to use descriptors Linus Walleij
@ 2017-10-05 11:03 ` Linus Walleij
2017-10-05 11:03 ` [PATCH 3/7 v3] i2c: gpio: Enforce open drain through gpiolib Linus Walleij
` (5 subsequent siblings)
7 siblings, 0 replies; 16+ messages in thread
From: Linus Walleij @ 2017-10-05 11:03 UTC (permalink / raw)
To: Wolfram Sang, linux-i2c; +Cc: Linus Walleij, linux-gpio
Some busses, like I2C, strictly need to have the line handled
as open drain, i.e. not actively driven high. For this reason
the i2c-gpio.c bit-banged I2C driver is reimplementing open
drain handling outside of gpiolib.
This is not very optimal. Instead make it possible for a
consumer to explcitly express that the line must be handled
as open drain instead of allowing local hacks papering over
this issue.
The descriptor tables, whether DT, ACPI or board files, should
of course have flagged these lines as open drain. E.g.:
enum gpio_lookup_flags GPIO_OPEN_DRAIN for a board file, or
gpios = <&foo 42 GPIO_ACTIVE_HIGH|GPIO_OPEN_DRAIN>; in a
device tree using <dt-bindings/gpio/gpio.h>
But more often than not, these descriptors are wrong. So
we need to make it possible for consumers to enforce this
open drain behaviour.
We now have two new enumerated GPIO descriptor config flags:
GPIOD_OUT_LOW_OPEN_DRAIN and GPIOD_OUT_HIGH_OPEN_DRAIN
that will set up the lined enforced as open drain as output
low or high, using open drain (if the driver supports it)
or using open drain emulation (setting the line as input
to drive it high) from the gpiolib core.
Cc: linux-gpio@vger.kernel.org
Tested-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
ChangeLog v1->v3:
- Rebased
Obviously I authorize this patch to be applied directly
to the I2C tree as part of the refactorings.
---
drivers/gpio/gpiolib.c | 13 +++++++++++++
include/linux/gpio/consumer.h | 6 ++++++
2 files changed, 19 insertions(+)
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index eb80dac4e26a..c952ef1b2f46 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -3264,8 +3264,21 @@ int gpiod_configure_flags(struct gpio_desc *desc, const char *con_id,
if (lflags & GPIO_ACTIVE_LOW)
set_bit(FLAG_ACTIVE_LOW, &desc->flags);
+
if (lflags & GPIO_OPEN_DRAIN)
set_bit(FLAG_OPEN_DRAIN, &desc->flags);
+ else if (dflags & GPIOD_FLAGS_BIT_OPEN_DRAIN) {
+ /*
+ * This enforces open drain mode from the consumer side.
+ * This is necessary for some busses like I2C, but the lookup
+ * should *REALLY* have specified them as open drain in the
+ * first place, so print a little warning here.
+ */
+ set_bit(FLAG_OPEN_DRAIN, &desc->flags);
+ gpiod_warn(desc,
+ "enforced open drain please flag it properly in DT/ACPI DSDT/board file\n");
+ }
+
if (lflags & GPIO_OPEN_SOURCE)
set_bit(FLAG_OPEN_SOURCE, &desc->flags);
if (lflags & GPIO_SLEEP_MAY_LOOSE_VALUE)
diff --git a/include/linux/gpio/consumer.h b/include/linux/gpio/consumer.h
index 8f702fcbe485..5f72a49d1aa3 100644
--- a/include/linux/gpio/consumer.h
+++ b/include/linux/gpio/consumer.h
@@ -28,6 +28,7 @@ struct gpio_descs {
#define GPIOD_FLAGS_BIT_DIR_SET BIT(0)
#define GPIOD_FLAGS_BIT_DIR_OUT BIT(1)
#define GPIOD_FLAGS_BIT_DIR_VAL BIT(2)
+#define GPIOD_FLAGS_BIT_OPEN_DRAIN BIT(3)
/**
* Optional flags that can be passed to one of gpiod_* to configure direction
@@ -39,6 +40,11 @@ enum gpiod_flags {
GPIOD_OUT_LOW = GPIOD_FLAGS_BIT_DIR_SET | GPIOD_FLAGS_BIT_DIR_OUT,
GPIOD_OUT_HIGH = GPIOD_FLAGS_BIT_DIR_SET | GPIOD_FLAGS_BIT_DIR_OUT |
GPIOD_FLAGS_BIT_DIR_VAL,
+ GPIOD_OUT_LOW_OPEN_DRAIN = GPIOD_FLAGS_BIT_DIR_SET |
+ GPIOD_FLAGS_BIT_DIR_OUT | GPIOD_FLAGS_BIT_OPEN_DRAIN,
+ GPIOD_OUT_HIGH_OPEN_DRAIN = GPIOD_FLAGS_BIT_DIR_SET |
+ GPIOD_FLAGS_BIT_DIR_OUT | GPIOD_FLAGS_BIT_DIR_VAL |
+ GPIOD_FLAGS_BIT_OPEN_DRAIN,
};
#ifdef CONFIG_GPIOLIB
--
2.13.5
^ permalink raw reply related [flat|nested] 16+ messages in thread
* [PATCH 3/7 v3] i2c: gpio: Enforce open drain through gpiolib
2017-10-05 11:03 [PATCH 0/7 v3] I2C GPIO to use gpiolibs open drain Linus Walleij
2017-10-05 11:03 ` [PATCH 1/7 v3] i2c: gpio: Convert to use descriptors Linus Walleij
2017-10-05 11:03 ` [PATCH 2/7 v3] gpio: Make it possible for consumers to enforce open drain Linus Walleij
@ 2017-10-05 11:03 ` Linus Walleij
2017-10-05 11:03 ` [PATCH 4/7 v3] i2c: gpio: Augment all boardfiles to use open drain Linus Walleij
` (4 subsequent siblings)
7 siblings, 0 replies; 16+ messages in thread
From: Linus Walleij @ 2017-10-05 11:03 UTC (permalink / raw)
To: Wolfram Sang, linux-i2c; +Cc: Linus Walleij
The I2C GPIO bitbang driver currently emulates open drain
behaviour by implementing what the gpiolib already does:
not actively driving the line high, instead setting it to
input.
This makes no sense. Use the new facility in gpiolib to
request the lines enforced into open drain mode, and let
the open drain emulation already present in the gpiolib
kick in and handle this.
As a bonus: if the GPIO driver in the back-end actually
supports open drain in hardware using the .set_config()
callback, it will be utilized. That's correct: we never
used that hardware feature before, instead relying on
emulating open drain even if the GPIO controller could
actually handle this for us.
Users will sometimes get messages like this:
gpio-485 (?): enforced open drain please flag it properly
in DT/ACPI DSDT/board file
gpio-486 (?): enforced open drain please flag it properly
in DT/ACPI DSDT/board file
i2c-gpio gpio-i2c: using lines 485 (SDA) and 486 (SCL)
Which is completely proper: since the line is used as
open drain, it should actually be flagged properly with
e.g.
gpios = <&gpio0 5 (GPIO_ACTIVE_HIGH|GPIO_OPEN_DRAIN)>,
<&gpio0 6 (GPIO_ACTIVE_HIGH|GPIO_OPEN_DRAIN)>;
Or similar facilities in board file descriptor tables
or ACPI DSDT.
Tested-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
ChangeLog v2->v3:
- Rebased
ChangeLog v1->v2:
- Fix a minor typo in error path (copy-paste scl was sda)
---
drivers/i2c/busses/i2c-gpio.c | 102 ++++++++++++++++--------------------------
1 file changed, 39 insertions(+), 63 deletions(-)
diff --git a/drivers/i2c/busses/i2c-gpio.c b/drivers/i2c/busses/i2c-gpio.c
index b4664037eded..97b9c29e9429 100644
--- a/drivers/i2c/busses/i2c-gpio.c
+++ b/drivers/i2c/busses/i2c-gpio.c
@@ -25,23 +25,6 @@ struct i2c_gpio_private_data {
struct i2c_gpio_platform_data pdata;
};
-/* Toggle SDA by changing the direction of the pin */
-static void i2c_gpio_setsda_dir(void *data, int state)
-{
- struct i2c_gpio_private_data *priv = data;
-
- /*
- * This is a way of saying "do not drive
- * me actively high" which means emulating open drain.
- * The right way to do this is for gpiolib to
- * handle this, by the function below.
- */
- if (state)
- gpiod_direction_input(priv->sda);
- else
- gpiod_direction_output(priv->sda, 0);
-}
-
/*
* Toggle SDA by changing the output value of the pin. This is only
* valid for pins configured as open drain (i.e. setting the value
@@ -54,17 +37,6 @@ static void i2c_gpio_setsda_val(void *data, int state)
gpiod_set_value(priv->sda, state);
}
-/* Toggle SCL by changing the direction of the pin. */
-static void i2c_gpio_setscl_dir(void *data, int state)
-{
- struct i2c_gpio_private_data *priv = data;
-
- if (state)
- gpiod_direction_input(priv->scl);
- else
- gpiod_direction_output(priv->scl, 0);
-}
-
/*
* Toggle SCL by changing the output value of the pin. This is used
* for pins that are configured as open drain and for output-only
@@ -116,30 +88,13 @@ static int i2c_gpio_probe(struct platform_device *pdev)
struct i2c_gpio_platform_data *pdata;
struct i2c_algo_bit_data *bit_data;
struct i2c_adapter *adap;
+ enum gpiod_flags gflags;
int ret;
priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
- /* First get the GPIO pins; if it fails, we'll defer the probe. */
- priv->sda = devm_gpiod_get_index(&pdev->dev, NULL, 0, GPIOD_OUT_HIGH);
- if (IS_ERR(priv->sda)) {
- ret = PTR_ERR(priv->sda);
- /* FIXME: hack in the old code, is this really necessary? */
- if (ret == -EINVAL)
- ret = -EPROBE_DEFER;
- return ret;
- }
- priv->scl = devm_gpiod_get_index(&pdev->dev, NULL, 1, GPIOD_OUT_LOW);
- if (IS_ERR(priv->scl)) {
- ret = PTR_ERR(priv->scl);
- /* FIXME: hack in the old code, is this really necessary? */
- if (ret == -EINVAL)
- ret = -EPROBE_DEFER;
- return ret;
- }
-
adap = &priv->adap;
bit_data = &priv->bit_data;
pdata = &priv->pdata;
@@ -157,27 +112,48 @@ static int i2c_gpio_probe(struct platform_device *pdev)
}
/*
- * FIXME: this is a hack emulating the open drain emulation
- * that gpiolib can already do for us. Make all clients properly
- * flag their lines as open drain and get rid of this property
- * and the special callback.
+ * First get the GPIO pins; if it fails, we'll defer the probe.
+ * If the SDA line is marked from platform data or device tree as
+ * "open drain" it means something outside of our control is making
+ * this line being handled as open drain, and we should just handle
+ * it as any other output. Else we enforce open drain as this is
+ * required for an I2C bus.
*/
- if (pdata->sda_is_open_drain) {
- gpiod_direction_output(priv->sda, 1);
- bit_data->setsda = i2c_gpio_setsda_val;
- } else {
- gpiod_direction_input(priv->sda);
- bit_data->setsda = i2c_gpio_setsda_dir;
+ if (pdata->sda_is_open_drain)
+ gflags = GPIOD_OUT_HIGH;
+ else
+ gflags = GPIOD_OUT_HIGH_OPEN_DRAIN;
+ priv->sda = devm_gpiod_get_index(&pdev->dev, NULL, 0, gflags);
+ if (IS_ERR(priv->sda)) {
+ ret = PTR_ERR(priv->sda);
+ /* FIXME: hack in the old code, is this really necessary? */
+ if (ret == -EINVAL)
+ ret = -EPROBE_DEFER;
+ return ret;
}
-
- if (pdata->scl_is_open_drain || pdata->scl_is_output_only) {
- gpiod_direction_output(priv->scl, 1);
- bit_data->setscl = i2c_gpio_setscl_val;
- } else {
- gpiod_direction_input(priv->scl);
- bit_data->setscl = i2c_gpio_setscl_dir;
+ /*
+ * If the SCL line is marked from platform data or device tree as
+ * "open drain" it means something outside of our control is making
+ * this line being handled as open drain, and we should just handle
+ * it as any other output. Else we enforce open drain as this is
+ * required for an I2C bus.
+ */
+ if (pdata->scl_is_open_drain)
+ gflags = GPIOD_OUT_LOW;
+ else
+ gflags = GPIOD_OUT_LOW_OPEN_DRAIN;
+ priv->scl = devm_gpiod_get_index(&pdev->dev, NULL, 1, gflags);
+ if (IS_ERR(priv->scl)) {
+ ret = PTR_ERR(priv->scl);
+ /* FIXME: hack in the old code, is this really necessary? */
+ if (ret == -EINVAL)
+ ret = -EPROBE_DEFER;
+ return ret;
}
+ bit_data->setsda = i2c_gpio_setsda_val;
+ bit_data->setscl = i2c_gpio_setscl_val;
+
if (!pdata->scl_is_output_only)
bit_data->getscl = i2c_gpio_getscl;
bit_data->getsda = i2c_gpio_getsda;
--
2.13.5
^ permalink raw reply related [flat|nested] 16+ messages in thread
* [PATCH 4/7 v3] i2c: gpio: Augment all boardfiles to use open drain
2017-10-05 11:03 [PATCH 0/7 v3] I2C GPIO to use gpiolibs open drain Linus Walleij
` (2 preceding siblings ...)
2017-10-05 11:03 ` [PATCH 3/7 v3] i2c: gpio: Enforce open drain through gpiolib Linus Walleij
@ 2017-10-05 11:03 ` Linus Walleij
2017-10-05 11:03 ` [PATCH 5/7 v3] i2c: gpio: Local vars in probe Linus Walleij
` (3 subsequent siblings)
7 siblings, 0 replies; 16+ messages in thread
From: Linus Walleij @ 2017-10-05 11:03 UTC (permalink / raw)
To: Wolfram Sang, linux-i2c; +Cc: Linus Walleij, Steven Miao, Ralf Baechle
We now handle the open drain mode internally in the I2C GPIO
driver, but we will get warnings from the gpiolib that we
override the default mode of the line so it becomes open
drain.
We can fix all in-kernel users by simply passing the right
flag along in the descriptor table, and we already touched
all of these files in the series so let's just tidy it up.
Cc: Steven Miao <realmz6@gmail.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Acked-by: Olof Johansson <olof@lixom.net>
Acked-by: Lee Jones <lee.jones@linaro.org>
Tested-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
ChangeLog v2->v3:
- Rebased
ChangeLog v1->v2:
- Collected ACKs.
Steven (Blackfin): requesting ACK for Wolfram to take this patch.
Ralf (MIPS): requesting ACK for Wolfram to take this patch.
---
arch/arm/mach-ep93xx/core.c | 6 ++++--
arch/arm/mach-ixp4xx/avila-setup.c | 4 ++--
arch/arm/mach-ixp4xx/dsmg600-setup.c | 4 ++--
arch/arm/mach-ixp4xx/fsg-setup.c | 4 ++--
arch/arm/mach-ixp4xx/ixdp425-setup.c | 4 ++--
arch/arm/mach-ixp4xx/nas100d-setup.c | 4 ++--
arch/arm/mach-ixp4xx/nslu2-setup.c | 4 ++--
arch/arm/mach-ks8695/board-acs5k.c | 6 ++++--
arch/arm/mach-pxa/palmz72.c | 6 ++++--
arch/arm/mach-pxa/viper.c | 8 ++++----
arch/arm/mach-sa1100/simpad.c | 6 ++++--
arch/blackfin/mach-bf533/boards/blackstamp.c | 4 ++--
arch/blackfin/mach-bf533/boards/ezkit.c | 4 ++--
arch/blackfin/mach-bf533/boards/stamp.c | 4 ++--
arch/blackfin/mach-bf561/boards/ezkit.c | 4 ++--
arch/mips/alchemy/board-gpr.c | 4 ++++
arch/mips/ath79/mach-pb44.c | 4 ++--
drivers/mfd/sm501.c | 4 ++--
18 files changed, 48 insertions(+), 36 deletions(-)
diff --git a/arch/arm/mach-ep93xx/core.c b/arch/arm/mach-ep93xx/core.c
index 7e99fe829ad1..e70feec6fad5 100644
--- a/arch/arm/mach-ep93xx/core.c
+++ b/arch/arm/mach-ep93xx/core.c
@@ -326,8 +326,10 @@ static struct gpiod_lookup_table ep93xx_i2c_gpiod_table = {
.dev_id = "i2c-gpio",
.table = {
/* Use local offsets on gpiochip/port "G" */
- GPIO_LOOKUP_IDX("G", 1, NULL, 0, GPIO_ACTIVE_HIGH),
- GPIO_LOOKUP_IDX("G", 0, NULL, 1, GPIO_ACTIVE_HIGH),
+ GPIO_LOOKUP_IDX("G", 1, NULL, 0,
+ GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
+ GPIO_LOOKUP_IDX("G", 0, NULL, 1,
+ GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
},
};
diff --git a/arch/arm/mach-ixp4xx/avila-setup.c b/arch/arm/mach-ixp4xx/avila-setup.c
index 72122b5e7f28..bb6fbfc9b11a 100644
--- a/arch/arm/mach-ixp4xx/avila-setup.c
+++ b/arch/arm/mach-ixp4xx/avila-setup.c
@@ -53,9 +53,9 @@ static struct gpiod_lookup_table avila_i2c_gpiod_table = {
.dev_id = "i2c-gpio",
.table = {
GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", AVILA_SDA_PIN,
- NULL, 0, GPIO_ACTIVE_HIGH),
+ NULL, 0, GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", AVILA_SCL_PIN,
- NULL, 1, GPIO_ACTIVE_HIGH),
+ NULL, 1, GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
},
};
diff --git a/arch/arm/mach-ixp4xx/dsmg600-setup.c b/arch/arm/mach-ixp4xx/dsmg600-setup.c
index 68ccd669051b..af543dd3da5d 100644
--- a/arch/arm/mach-ixp4xx/dsmg600-setup.c
+++ b/arch/arm/mach-ixp4xx/dsmg600-setup.c
@@ -72,9 +72,9 @@ static struct gpiod_lookup_table dsmg600_i2c_gpiod_table = {
.dev_id = "i2c-gpio",
.table = {
GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", DSMG600_SDA_PIN,
- NULL, 0, GPIO_ACTIVE_HIGH),
+ NULL, 0, GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", DSMG600_SCL_PIN,
- NULL, 1, GPIO_ACTIVE_HIGH),
+ NULL, 1, GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
},
};
diff --git a/arch/arm/mach-ixp4xx/fsg-setup.c b/arch/arm/mach-ixp4xx/fsg-setup.c
index a0350ad15175..8afb3f4db376 100644
--- a/arch/arm/mach-ixp4xx/fsg-setup.c
+++ b/arch/arm/mach-ixp4xx/fsg-setup.c
@@ -58,9 +58,9 @@ static struct gpiod_lookup_table fsg_i2c_gpiod_table = {
.dev_id = "i2c-gpio",
.table = {
GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", FSG_SDA_PIN,
- NULL, 0, GPIO_ACTIVE_HIGH),
+ NULL, 0, GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", FSG_SCL_PIN,
- NULL, 1, GPIO_ACTIVE_HIGH),
+ NULL, 1, GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
},
};
diff --git a/arch/arm/mach-ixp4xx/ixdp425-setup.c b/arch/arm/mach-ixp4xx/ixdp425-setup.c
index 8937263cec4a..4f358350a91f 100644
--- a/arch/arm/mach-ixp4xx/ixdp425-setup.c
+++ b/arch/arm/mach-ixp4xx/ixdp425-setup.c
@@ -126,9 +126,9 @@ static struct gpiod_lookup_table ixdp425_i2c_gpiod_table = {
.dev_id = "i2c-gpio",
.table = {
GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", IXDP425_SDA_PIN,
- NULL, 0, GPIO_ACTIVE_HIGH),
+ NULL, 0, GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", IXDP425_SCL_PIN,
- NULL, 1, GPIO_ACTIVE_HIGH),
+ NULL, 1, GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
},
};
diff --git a/arch/arm/mach-ixp4xx/nas100d-setup.c b/arch/arm/mach-ixp4xx/nas100d-setup.c
index 612ec8c63456..7e59c59c96a3 100644
--- a/arch/arm/mach-ixp4xx/nas100d-setup.c
+++ b/arch/arm/mach-ixp4xx/nas100d-setup.c
@@ -104,9 +104,9 @@ static struct gpiod_lookup_table nas100d_i2c_gpiod_table = {
.dev_id = "i2c-gpio",
.table = {
GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", NAS100D_SDA_PIN,
- NULL, 0, GPIO_ACTIVE_HIGH),
+ NULL, 0, GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", NAS100D_SCL_PIN,
- NULL, 1, GPIO_ACTIVE_HIGH),
+ NULL, 1, GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
},
};
diff --git a/arch/arm/mach-ixp4xx/nslu2-setup.c b/arch/arm/mach-ixp4xx/nslu2-setup.c
index 13afb03b50fa..224717eb8ac2 100644
--- a/arch/arm/mach-ixp4xx/nslu2-setup.c
+++ b/arch/arm/mach-ixp4xx/nslu2-setup.c
@@ -72,9 +72,9 @@ static struct gpiod_lookup_table nslu2_i2c_gpiod_table = {
.dev_id = "i2c-gpio",
.table = {
GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", NSLU2_SDA_PIN,
- NULL, 0, GPIO_ACTIVE_HIGH),
+ NULL, 0, GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", NSLU2_SCL_PIN,
- NULL, 1, GPIO_ACTIVE_HIGH),
+ NULL, 1, GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
},
};
diff --git a/arch/arm/mach-ks8695/board-acs5k.c b/arch/arm/mach-ks8695/board-acs5k.c
index f034724e01e1..937eb1d47e7b 100644
--- a/arch/arm/mach-ks8695/board-acs5k.c
+++ b/arch/arm/mach-ks8695/board-acs5k.c
@@ -41,8 +41,10 @@
static struct gpiod_lookup_table acs5k_i2c_gpiod_table = {
.dev_id = "i2c-gpio",
.table = {
- GPIO_LOOKUP_IDX("KS8695", 4, NULL, 0, GPIO_ACTIVE_HIGH),
- GPIO_LOOKUP_IDX("KS8695", 5, NULL, 1, GPIO_ACTIVE_HIGH),
+ GPIO_LOOKUP_IDX("KS8695", 4, NULL, 0,
+ GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
+ GPIO_LOOKUP_IDX("KS8695", 5, NULL, 1,
+ GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
},
};
diff --git a/arch/arm/mach-pxa/palmz72.c b/arch/arm/mach-pxa/palmz72.c
index 94f75632c007..5877e547cecd 100644
--- a/arch/arm/mach-pxa/palmz72.c
+++ b/arch/arm/mach-pxa/palmz72.c
@@ -324,8 +324,10 @@ static struct soc_camera_link palmz72_iclink = {
static struct gpiod_lookup_table palmz72_i2c_gpiod_table = {
.dev_id = "i2c-gpio",
.table = {
- GPIO_LOOKUP_IDX("gpio-pxa", 118, NULL, 0, GPIO_ACTIVE_HIGH),
- GPIO_LOOKUP_IDX("gpio-pxa", 117, NULL, 1, GPIO_ACTIVE_HIGH),
+ GPIO_LOOKUP_IDX("gpio-pxa", 118, NULL, 0,
+ GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
+ GPIO_LOOKUP_IDX("gpio-pxa", 117, NULL, 1,
+ GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
},
};
diff --git a/arch/arm/mach-pxa/viper.c b/arch/arm/mach-pxa/viper.c
index a680742bee2b..4185e7ff073f 100644
--- a/arch/arm/mach-pxa/viper.c
+++ b/arch/arm/mach-pxa/viper.c
@@ -463,9 +463,9 @@ static struct gpiod_lookup_table viper_i2c_gpiod_table = {
.dev_id = "i2c-gpio",
.table = {
GPIO_LOOKUP_IDX("gpio-pxa", VIPER_RTC_I2C_SDA_GPIO,
- NULL, 0, GPIO_ACTIVE_HIGH),
+ NULL, 0, GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
GPIO_LOOKUP_IDX("gpio-pxa", VIPER_RTC_I2C_SCL_GPIO,
- NULL, 1, GPIO_ACTIVE_HIGH),
+ NULL, 1, GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
},
};
@@ -792,9 +792,9 @@ struct gpiod_lookup_table viper_tpm_i2c_gpiod_table = {
.dev_id = "i2c-gpio",
.table = {
GPIO_LOOKUP_IDX("gpio-pxa", VIPER_TPM_I2C_SDA_GPIO,
- NULL, 0, GPIO_ACTIVE_HIGH),
+ NULL, 0, GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
GPIO_LOOKUP_IDX("gpio-pxa", VIPER_TPM_I2C_SCL_GPIO,
- NULL, 1, GPIO_ACTIVE_HIGH),
+ NULL, 1, GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
},
};
diff --git a/arch/arm/mach-sa1100/simpad.c b/arch/arm/mach-sa1100/simpad.c
index c6e7e6d8733a..91526024964b 100644
--- a/arch/arm/mach-sa1100/simpad.c
+++ b/arch/arm/mach-sa1100/simpad.c
@@ -327,8 +327,10 @@ static struct platform_device simpad_gpio_leds = {
static struct gpiod_lookup_table simpad_i2c_gpiod_table = {
.dev_id = "i2c-gpio",
.table = {
- GPIO_LOOKUP_IDX("gpio", GPIO_GPIO21, NULL, 0, GPIO_ACTIVE_HIGH),
- GPIO_LOOKUP_IDX("gpio", GPIO_GPIO25, NULL, 1, GPIO_ACTIVE_HIGH),
+ GPIO_LOOKUP_IDX("gpio", GPIO_GPIO21, NULL, 0,
+ GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
+ GPIO_LOOKUP_IDX("gpio", GPIO_GPIO25, NULL, 1,
+ GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
},
};
diff --git a/arch/blackfin/mach-bf533/boards/blackstamp.c b/arch/blackfin/mach-bf533/boards/blackstamp.c
index d801ca5ca6c4..fab69c736515 100644
--- a/arch/blackfin/mach-bf533/boards/blackstamp.c
+++ b/arch/blackfin/mach-bf533/boards/blackstamp.c
@@ -367,9 +367,9 @@ static struct gpiod_lookup_table bfin_i2c_gpiod_table = {
.dev_id = "i2c-gpio",
.table = {
GPIO_LOOKUP_IDX("BFIN-GPIO", GPIO_PF8, NULL, 0,
- GPIO_ACTIVE_HIGH),
+ GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
GPIO_LOOKUP_IDX("BFIN-GPIO", GPIO_PF9, NULL, 1,
- GPIO_ACTIVE_HIGH),
+ GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
},
};
diff --git a/arch/blackfin/mach-bf533/boards/ezkit.c b/arch/blackfin/mach-bf533/boards/ezkit.c
index 463a72358b0e..d64d270e9e62 100644
--- a/arch/blackfin/mach-bf533/boards/ezkit.c
+++ b/arch/blackfin/mach-bf533/boards/ezkit.c
@@ -395,9 +395,9 @@ static struct gpiod_lookup_table bfin_i2c_gpiod_table = {
.dev_id = "i2c-gpio",
.table = {
GPIO_LOOKUP_IDX("BFIN-GPIO", GPIO_PF1, NULL, 0,
- GPIO_ACTIVE_HIGH),
+ GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
GPIO_LOOKUP_IDX("BFIN-GPIO", GPIO_PF0, NULL, 1,
- GPIO_ACTIVE_HIGH),
+ GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
},
};
diff --git a/arch/blackfin/mach-bf533/boards/stamp.c b/arch/blackfin/mach-bf533/boards/stamp.c
index d2479359adb7..27cbf2fa2c62 100644
--- a/arch/blackfin/mach-bf533/boards/stamp.c
+++ b/arch/blackfin/mach-bf533/boards/stamp.c
@@ -517,9 +517,9 @@ static struct gpiod_lookup_table bfin_i2c_gpiod_table = {
.dev_id = "i2c-gpio",
.table = {
GPIO_LOOKUP_IDX("BFIN-GPIO", GPIO_PF2, NULL, 0,
- GPIO_ACTIVE_HIGH),
+ GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
GPIO_LOOKUP_IDX("BFIN-GPIO", GPIO_PF3, NULL, 1,
- GPIO_ACTIVE_HIGH),
+ GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
},
};
diff --git a/arch/blackfin/mach-bf561/boards/ezkit.c b/arch/blackfin/mach-bf561/boards/ezkit.c
index 72f757ebaa84..acc5363f60c6 100644
--- a/arch/blackfin/mach-bf561/boards/ezkit.c
+++ b/arch/blackfin/mach-bf561/boards/ezkit.c
@@ -384,9 +384,9 @@ static struct gpiod_lookup_table bfin_i2c_gpiod_table = {
.dev_id = "i2c-gpio",
.table = {
GPIO_LOOKUP_IDX("BFIN-GPIO", GPIO_PF1, NULL, 0,
- GPIO_ACTIVE_HIGH),
+ GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
GPIO_LOOKUP_IDX("BFIN-GPIO", GPIO_PF0, NULL, 1,
- GPIO_ACTIVE_HIGH),
+ GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
},
};
diff --git a/arch/mips/alchemy/board-gpr.c b/arch/mips/alchemy/board-gpr.c
index daebc36e5ecb..328d697e72b4 100644
--- a/arch/mips/alchemy/board-gpr.c
+++ b/arch/mips/alchemy/board-gpr.c
@@ -235,6 +235,10 @@ static struct gpiod_lookup_table gpr_i2c_gpiod_table = {
};
static struct i2c_gpio_platform_data gpr_i2c_data = {
+ /*
+ * The open drain mode is hardwired somewhere or an electrical
+ * property of the alchemy GPIO controller.
+ */
.sda_is_open_drain = 1,
.scl_is_open_drain = 1,
.udelay = 2, /* ~100 kHz */
diff --git a/arch/mips/ath79/mach-pb44.c b/arch/mips/ath79/mach-pb44.c
index a95409063847..6b2c6f3baefa 100644
--- a/arch/mips/ath79/mach-pb44.c
+++ b/arch/mips/ath79/mach-pb44.c
@@ -37,9 +37,9 @@ static struct gpiod_lookup_table pb44_i2c_gpiod_table = {
.dev_id = "i2c-gpio",
.table = {
GPIO_LOOKUP_IDX("ath79-gpio", PB44_GPIO_I2C_SDA,
- NULL, 0, GPIO_ACTIVE_HIGH),
+ NULL, 0, GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
GPIO_LOOKUP_IDX("ath79-gpio", PB44_GPIO_I2C_SCL,
- NULL, 1, GPIO_ACTIVE_HIGH),
+ NULL, 1, GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
},
};
diff --git a/drivers/mfd/sm501.c b/drivers/mfd/sm501.c
index 4d40d013a412..ad774161a22d 100644
--- a/drivers/mfd/sm501.c
+++ b/drivers/mfd/sm501.c
@@ -1152,7 +1152,7 @@ static int sm501_register_gpio_i2c_instance(struct sm501_devdata *sm,
lookup->table[0].chip_hwnum = iic->pin_sda % 32;
lookup->table[0].con_id = NULL;
lookup->table[0].idx = 0;
- lookup->table[0].flags = GPIO_ACTIVE_HIGH;
+ lookup->table[0].flags = GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN;
if (iic->pin_scl < 32)
lookup->table[1].chip_label = "SM501-LOW";
else
@@ -1160,7 +1160,7 @@ static int sm501_register_gpio_i2c_instance(struct sm501_devdata *sm,
lookup->table[1].chip_hwnum = iic->pin_scl % 32;
lookup->table[1].con_id = NULL;
lookup->table[1].idx = 1;
- lookup->table[1].flags = GPIO_ACTIVE_HIGH;
+ lookup->table[1].flags = GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN;
gpiod_add_lookup_table(lookup);
icd = dev_get_platdata(&pdev->dev);
--
2.13.5
^ permalink raw reply related [flat|nested] 16+ messages in thread
* [PATCH 5/7 v3] i2c: gpio: Local vars in probe
2017-10-05 11:03 [PATCH 0/7 v3] I2C GPIO to use gpiolibs open drain Linus Walleij
` (3 preceding siblings ...)
2017-10-05 11:03 ` [PATCH 4/7 v3] i2c: gpio: Augment all boardfiles to use open drain Linus Walleij
@ 2017-10-05 11:03 ` Linus Walleij
[not found] ` <20171005110310.5900-1-linus.walleij-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
` (2 subsequent siblings)
7 siblings, 0 replies; 16+ messages in thread
From: Linus Walleij @ 2017-10-05 11:03 UTC (permalink / raw)
To: Wolfram Sang, linux-i2c; +Cc: Linus Walleij
By creating local variables for *dev and *np, the code become
much easier to read, in my opinion.
Tested-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
ChangeLog v2->v3:
- Put memcpy on a single line, keeping down the LoC changed
I put this at the end of the series because compared to the
rest of the patches it is completely unimportant.
---
drivers/i2c/busses/i2c-gpio.c | 27 ++++++++++++++-------------
1 file changed, 14 insertions(+), 13 deletions(-)
diff --git a/drivers/i2c/busses/i2c-gpio.c b/drivers/i2c/busses/i2c-gpio.c
index 97b9c29e9429..a702e493275c 100644
--- a/drivers/i2c/busses/i2c-gpio.c
+++ b/drivers/i2c/busses/i2c-gpio.c
@@ -88,10 +88,12 @@ static int i2c_gpio_probe(struct platform_device *pdev)
struct i2c_gpio_platform_data *pdata;
struct i2c_algo_bit_data *bit_data;
struct i2c_adapter *adap;
+ struct device *dev = &pdev->dev;
+ struct device_node *np = dev->of_node;
enum gpiod_flags gflags;
int ret;
- priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
+ priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
@@ -99,16 +101,15 @@ static int i2c_gpio_probe(struct platform_device *pdev)
bit_data = &priv->bit_data;
pdata = &priv->pdata;
- if (pdev->dev.of_node) {
- of_i2c_gpio_get_props(pdev->dev.of_node, pdata);
+ if (np) {
+ of_i2c_gpio_get_props(np, pdata);
} else {
/*
* If all platform data settings are zero it is OK
* to not provide any platform data from the board.
*/
- if (dev_get_platdata(&pdev->dev))
- memcpy(pdata, dev_get_platdata(&pdev->dev),
- sizeof(*pdata));
+ if (dev_get_platdata(dev))
+ memcpy(pdata, dev_get_platdata(dev), sizeof(*pdata));
}
/*
@@ -123,7 +124,7 @@ static int i2c_gpio_probe(struct platform_device *pdev)
gflags = GPIOD_OUT_HIGH;
else
gflags = GPIOD_OUT_HIGH_OPEN_DRAIN;
- priv->sda = devm_gpiod_get_index(&pdev->dev, NULL, 0, gflags);
+ priv->sda = devm_gpiod_get_index(dev, NULL, 0, gflags);
if (IS_ERR(priv->sda)) {
ret = PTR_ERR(priv->sda);
/* FIXME: hack in the old code, is this really necessary? */
@@ -142,7 +143,7 @@ static int i2c_gpio_probe(struct platform_device *pdev)
gflags = GPIOD_OUT_LOW;
else
gflags = GPIOD_OUT_LOW_OPEN_DRAIN;
- priv->scl = devm_gpiod_get_index(&pdev->dev, NULL, 1, gflags);
+ priv->scl = devm_gpiod_get_index(dev, NULL, 1, gflags);
if (IS_ERR(priv->scl)) {
ret = PTR_ERR(priv->scl);
/* FIXME: hack in the old code, is this really necessary? */
@@ -173,15 +174,15 @@ static int i2c_gpio_probe(struct platform_device *pdev)
bit_data->data = priv;
adap->owner = THIS_MODULE;
- if (pdev->dev.of_node)
- strlcpy(adap->name, dev_name(&pdev->dev), sizeof(adap->name));
+ if (np)
+ strlcpy(adap->name, dev_name(dev), sizeof(adap->name));
else
snprintf(adap->name, sizeof(adap->name), "i2c-gpio%d", pdev->id);
adap->algo_data = bit_data;
adap->class = I2C_CLASS_HWMON | I2C_CLASS_SPD;
- adap->dev.parent = &pdev->dev;
- adap->dev.of_node = pdev->dev.of_node;
+ adap->dev.parent = dev;
+ adap->dev.of_node = np;
adap->nr = pdev->id;
ret = i2c_bit_add_numbered_bus(adap);
@@ -195,7 +196,7 @@ static int i2c_gpio_probe(struct platform_device *pdev)
* get accessors to get the actual name of the GPIO line,
* from the descriptor, then provide that instead.
*/
- dev_info(&pdev->dev, "using lines %u (SDA) and %u (SCL%s)\n",
+ dev_info(dev, "using lines %u (SDA) and %u (SCL%s)\n",
desc_to_gpio(priv->sda), desc_to_gpio(priv->scl),
pdata->scl_is_output_only
? ", no clock stretching" : "");
--
2.13.5
^ permalink raw reply related [flat|nested] 16+ messages in thread
* [PATCH 6/7 v3] dt-bindings: i2c: i2c-gpio: Add support for named gpios
[not found] ` <20171005110310.5900-1-linus.walleij-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
@ 2017-10-05 11:03 ` Linus Walleij
0 siblings, 0 replies; 16+ messages in thread
From: Linus Walleij @ 2017-10-05 11:03 UTC (permalink / raw)
To: Wolfram Sang, linux-i2c-u79uwXL29TY76Z2rM5mHXA
Cc: Geert Uytterhoeven, devicetree-u79uwXL29TY76Z2rM5mHXA, Linus Walleij
From: Geert Uytterhoeven <geert+renesas-gXvu3+zWzMSzQB+pC5nmwQ@public.gmane.org>
The current i2c-gpio DT bindings use a single unnamed "gpios" property
to refer to the SDA and SCL signal lines by index. This is error-prone
for the casual DT writer and reviewer, as one has to look up the order
in the DT bindings.
Fix this by amending the DT bindings to use two separate named gpios
properties, and deprecate the old unnamed variant.
Take this opportunity to clearly deprecate the "i2c-gpio,sda-open-drain"
and "i2c-gpio,scl-open-drain" flags as well. The commit describes
in detail what these flags actually mean, and why they should not be
used in new device trees.
Cc: devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Signed-off-by: Geert Uytterhoeven <geert+renesas-gXvu3+zWzMSzQB+pC5nmwQ@public.gmane.org>
[Augmented to what I and Rob would like]
Tested-by: Geert Uytterhoeven <geert+renesas-gXvu3+zWzMSzQB+pC5nmwQ@public.gmane.org>
Acked-by: Rob Herring <robh-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
Signed-off-by: Linus Walleij <linus.walleij-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
---
ChangeLog v2->v3:
- Collect Rob's ACK.
ChangeLog v1->v2:
- Create a special section for the deprecated bindings
- Also deprecate the open drain bool properties
- Update the example to use the new style of bindings
---
Documentation/devicetree/bindings/i2c/i2c-gpio.txt | 32 ++++++++++++++++------
1 file changed, 23 insertions(+), 9 deletions(-)
diff --git a/Documentation/devicetree/bindings/i2c/i2c-gpio.txt b/Documentation/devicetree/bindings/i2c/i2c-gpio.txt
index 4f8ec947c6bd..38a05562d1d2 100644
--- a/Documentation/devicetree/bindings/i2c/i2c-gpio.txt
+++ b/Documentation/devicetree/bindings/i2c/i2c-gpio.txt
@@ -2,25 +2,39 @@ Device-Tree bindings for i2c gpio driver
Required properties:
- compatible = "i2c-gpio";
- - gpios: sda and scl gpio
-
+ - sda-gpios: gpio used for the sda signal, this should be flagged as
+ active high using open drain with (GPIO_ACTIVE_HIGH|GPIO_OPEN_DRAIN)
+ from <dt-bindings/gpio/gpio.h> since the signal is by definition
+ open drain.
+ - scl-gpios: gpio used for the scl signal, this should be flagged as
+ active high using open drain with (GPIO_ACTIVE_HIGH|GPIO_OPEN_DRAIN)
+ from <dt-bindings/gpio/gpio.h> since the signal is by definition
+ open drain.
Optional properties:
- - i2c-gpio,sda-open-drain: sda as open drain
- - i2c-gpio,scl-open-drain: scl as open drain
- i2c-gpio,scl-output-only: scl as output only
- i2c-gpio,delay-us: delay between GPIO operations (may depend on each platform)
- i2c-gpio,timeout-ms: timeout to get data
+Deprecated properties, do not use in new device tree sources:
+ - gpios: sda and scl gpio, alternative for {sda,scl}-gpios
+ - i2c-gpio,sda-open-drain: this means that something outside of our
+ control has put the GPIO line used for SDA into open drain mode, and
+ that something is not the GPIO chip. It is essentially an
+ inconsistency flag.
+ - i2c-gpio,scl-open-drain: this means that something outside of our
+ control has put the GPIO line used for SCL into open drain mode, and
+ that something is not the GPIO chip. It is essentially an
+ inconsistency flag.
+
Example nodes:
+#include <dt-bindings/gpio/gpio.h>
+
i2c@0 {
compatible = "i2c-gpio";
- gpios = <&pioA 23 0 /* sda */
- &pioA 24 0 /* scl */
- >;
- i2c-gpio,sda-open-drain;
- i2c-gpio,scl-open-drain;
+ sda-gpios = <&pioA 23 (GPIO_ACTIVE_HIGH|GPIO_OPEN_DRAIN)>;
+ scl-gpios = <&pioA 24 (GPIO_ACTIVE_HIGH|GPIO_OPEN_DRAIN)>;
i2c-gpio,delay-us = <2>; /* ~100 kHz */
#address-cells = <1>;
#size-cells = <0>;
--
2.13.5
--
To unsubscribe from this list: send the line "unsubscribe devicetree" in
the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
^ permalink raw reply related [flat|nested] 16+ messages in thread
* [PATCH 7/7 v3] i2c: gpio: Add support for named gpios in DT
2017-10-05 11:03 [PATCH 0/7 v3] I2C GPIO to use gpiolibs open drain Linus Walleij
` (5 preceding siblings ...)
[not found] ` <20171005110310.5900-1-linus.walleij-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
@ 2017-10-05 11:03 ` Linus Walleij
2017-10-19 14:37 ` [PATCH 0/7 v3] I2C GPIO to use gpiolibs open drain Linus Walleij
7 siblings, 0 replies; 16+ messages in thread
From: Linus Walleij @ 2017-10-05 11:03 UTC (permalink / raw)
To: Wolfram Sang, linux-i2c; +Cc: Linus Walleij
This adds support for using the "sda" and "scl" GPIOs in
device tree instead of anonymously using index 0 and 1 of
the "gpios" property.
We add a helper function to retrieve the GPIO descriptors
and some explicit error handling since the probe may have
to be deferred. At least this happened to me when moving
to using named "sda" and "scl" lines (all of a sudden this
started to probe before the GPIO driver) so we need to
gracefully defer probe when we ge -ENOENT in the error
pointer.
Suggested-by: Geert Uytterhoeven <geert+renesas@glider.be>
Tested-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
ChangeLog v2->v3:
- Switched using %d to print error code rather than %ld
This is pretty much a rewrite of Geerts patch on top of
my own changes to support descriptors.
---
drivers/i2c/busses/i2c-gpio.c | 59 +++++++++++++++++++++++++++++++------------
1 file changed, 43 insertions(+), 16 deletions(-)
diff --git a/drivers/i2c/busses/i2c-gpio.c b/drivers/i2c/busses/i2c-gpio.c
index a702e493275c..d80ea6ce91bb 100644
--- a/drivers/i2c/busses/i2c-gpio.c
+++ b/drivers/i2c/busses/i2c-gpio.c
@@ -82,6 +82,42 @@ static void of_i2c_gpio_get_props(struct device_node *np,
of_property_read_bool(np, "i2c-gpio,scl-output-only");
}
+static struct gpio_desc *i2c_gpio_get_desc(struct device *dev,
+ const char *con_id,
+ unsigned int index,
+ enum gpiod_flags gflags)
+{
+ struct gpio_desc *retdesc;
+ int ret;
+
+ retdesc = devm_gpiod_get(dev, con_id, gflags);
+ if (!IS_ERR(retdesc)) {
+ dev_dbg(dev, "got GPIO from name %s\n", con_id);
+ return retdesc;
+ }
+
+ retdesc = devm_gpiod_get_index(dev, NULL, index, gflags);
+ if (!IS_ERR(retdesc)) {
+ dev_dbg(dev, "got GPIO from index %u\n", index);
+ return retdesc;
+ }
+
+ ret = PTR_ERR(retdesc);
+
+ /* FIXME: hack in the old code, is this really necessary? */
+ if (ret == -EINVAL)
+ retdesc = ERR_PTR(-EPROBE_DEFER);
+
+ /* This happens if the GPIO driver is not yet probed, let's defer */
+ if (ret == -ENOENT)
+ retdesc = ERR_PTR(-EPROBE_DEFER);
+
+ if (ret != -EPROBE_DEFER)
+ dev_err(dev, "error trying to get descriptor: %d\n", ret);
+
+ return retdesc;
+}
+
static int i2c_gpio_probe(struct platform_device *pdev)
{
struct i2c_gpio_private_data *priv;
@@ -124,14 +160,10 @@ static int i2c_gpio_probe(struct platform_device *pdev)
gflags = GPIOD_OUT_HIGH;
else
gflags = GPIOD_OUT_HIGH_OPEN_DRAIN;
- priv->sda = devm_gpiod_get_index(dev, NULL, 0, gflags);
- if (IS_ERR(priv->sda)) {
- ret = PTR_ERR(priv->sda);
- /* FIXME: hack in the old code, is this really necessary? */
- if (ret == -EINVAL)
- ret = -EPROBE_DEFER;
- return ret;
- }
+ priv->sda = i2c_gpio_get_desc(dev, "sda", 0, gflags);
+ if (IS_ERR(priv->sda))
+ return PTR_ERR(priv->sda);
+
/*
* If the SCL line is marked from platform data or device tree as
* "open drain" it means something outside of our control is making
@@ -143,14 +175,9 @@ static int i2c_gpio_probe(struct platform_device *pdev)
gflags = GPIOD_OUT_LOW;
else
gflags = GPIOD_OUT_LOW_OPEN_DRAIN;
- priv->scl = devm_gpiod_get_index(dev, NULL, 1, gflags);
- if (IS_ERR(priv->scl)) {
- ret = PTR_ERR(priv->scl);
- /* FIXME: hack in the old code, is this really necessary? */
- if (ret == -EINVAL)
- ret = -EPROBE_DEFER;
- return ret;
- }
+ priv->scl = i2c_gpio_get_desc(dev, "scl", 1, gflags);
+ if (IS_ERR(priv->scl))
+ return PTR_ERR(priv->scl);
bit_data->setsda = i2c_gpio_setsda_val;
bit_data->setscl = i2c_gpio_setscl_val;
--
2.13.5
^ permalink raw reply related [flat|nested] 16+ messages in thread
* Re: [PATCH 0/7 v3] I2C GPIO to use gpiolibs open drain
2017-10-05 11:03 [PATCH 0/7 v3] I2C GPIO to use gpiolibs open drain Linus Walleij
` (6 preceding siblings ...)
2017-10-05 11:03 ` [PATCH 7/7 v3] i2c: gpio: Add support for named gpios in DT Linus Walleij
@ 2017-10-19 14:37 ` Linus Walleij
2017-10-19 14:40 ` Wolfram Sang
` (2 more replies)
7 siblings, 3 replies; 16+ messages in thread
From: Linus Walleij @ 2017-10-19 14:37 UTC (permalink / raw)
To: Wolfram Sang, linux-i2c; +Cc: Linus Walleij
On Thu, Oct 5, 2017 at 1:03 PM, Linus Walleij <linus.walleij@linaro.org> wrote:
> Finalized this series and collected the ACKs.
>
> Wolfram: if not too late for v4.15, please carry this series.
Sorry to bother with this, it's fine if you don't have time
to do the administration for this refactoring for v4.15.
There is a git branch:
https://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio.git/log/?h=gpio-descriptors-i2c
If you want I can make a branch without the revision
comments and prepare a pull request on whatever
-rc you prefer.
If you want I can merge it through the GPIO tree with
your ACK if you need to get offloaded.
I can also hold it back for v4.16, just that then I want to
merge the GPIO infrastructure patches to GPIO
already.
Yours,
Linus Walleij
^ permalink raw reply [flat|nested] 16+ messages in thread
* Re: [PATCH 0/7 v3] I2C GPIO to use gpiolibs open drain
2017-10-19 14:37 ` [PATCH 0/7 v3] I2C GPIO to use gpiolibs open drain Linus Walleij
@ 2017-10-19 14:40 ` Wolfram Sang
2017-10-27 13:49 ` Wolfram Sang
2017-10-27 13:55 ` Wolfram Sang
2 siblings, 0 replies; 16+ messages in thread
From: Wolfram Sang @ 2017-10-19 14:40 UTC (permalink / raw)
To: Linus Walleij; +Cc: linux-i2c
[-- Attachment #1: Type: text/plain, Size: 195 bytes --]
> Sorry to bother with this, it's fine if you don't have time
> to do the administration for this refactoring for v4.15.
My plan is to review it this weekend and hopefully merge it for v4.15.
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^ permalink raw reply [flat|nested] 16+ messages in thread
* Re: [PATCH 0/7 v3] I2C GPIO to use gpiolibs open drain
2017-10-19 14:37 ` [PATCH 0/7 v3] I2C GPIO to use gpiolibs open drain Linus Walleij
2017-10-19 14:40 ` Wolfram Sang
@ 2017-10-27 13:49 ` Wolfram Sang
2017-10-30 0:28 ` Wolfram Sang
2017-10-27 13:55 ` Wolfram Sang
2 siblings, 1 reply; 16+ messages in thread
From: Wolfram Sang @ 2017-10-27 13:49 UTC (permalink / raw)
To: Linus Walleij; +Cc: linux-i2c
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Hey Linus,
> Sorry to bother with this, it's fine if you don't have time
> to do the administration for this refactoring for v4.15.
So, I finally had a look at this series and it looks good to me.
I don't know about the missing ACKs, though. My experience is that we
don't get ACKs for Blackfin these days, but there is still some MIPS and
MFD ack missing? Can you ping them again?
> If you want I can merge it through the GPIO tree with
> your ACK if you need to get offloaded.
I prefer I2C if you don't mind.
Regards,
Wolfram
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^ permalink raw reply [flat|nested] 16+ messages in thread
* Re: [PATCH 0/7 v3] I2C GPIO to use gpiolibs open drain
2017-10-19 14:37 ` [PATCH 0/7 v3] I2C GPIO to use gpiolibs open drain Linus Walleij
2017-10-19 14:40 ` Wolfram Sang
2017-10-27 13:49 ` Wolfram Sang
@ 2017-10-27 13:55 ` Wolfram Sang
2017-10-29 23:19 ` Linus Walleij
2 siblings, 1 reply; 16+ messages in thread
From: Wolfram Sang @ 2017-10-27 13:55 UTC (permalink / raw)
To: Linus Walleij; +Cc: linux-i2c
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> There is a git branch:
> https://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio.git/log/?h=gpio-descriptors-i2c
I assume this branch has been tested by buildbot already?
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^ permalink raw reply [flat|nested] 16+ messages in thread
* Re: [PATCH 0/7 v3] I2C GPIO to use gpiolibs open drain
2017-10-27 13:55 ` Wolfram Sang
@ 2017-10-29 23:19 ` Linus Walleij
0 siblings, 0 replies; 16+ messages in thread
From: Linus Walleij @ 2017-10-29 23:19 UTC (permalink / raw)
To: Wolfram Sang; +Cc: linux-i2c
On Fri, Oct 27, 2017 at 3:55 PM, Wolfram Sang <wsa@the-dreams.de> wrote:
>
>> There is a git branch:
>> https://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio.git/log/?h=gpio-descriptors-i2c
>
> I assume this branch has been tested by buildbot already?
Yes it all gets tested all the time. Compiled fine.
Yours,
Linus Walleij
^ permalink raw reply [flat|nested] 16+ messages in thread
* Re: [PATCH 0/7 v3] I2C GPIO to use gpiolibs open drain
2017-10-27 13:49 ` Wolfram Sang
@ 2017-10-30 0:28 ` Wolfram Sang
2017-10-30 7:52 ` Linus Walleij
0 siblings, 1 reply; 16+ messages in thread
From: Wolfram Sang @ 2017-10-30 0:28 UTC (permalink / raw)
To: Linus Walleij; +Cc: linux-i2c
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> don't get ACKs for Blackfin these days, but there is still some MIPS and
> MFD ack missing? Can you ping them again?
Update: Lee's ack is already collected and Ralf acked V1 of this series.
Did you miss to include it in v3? Or did the patch change so much?
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^ permalink raw reply [flat|nested] 16+ messages in thread
* Re: [PATCH 0/7 v3] I2C GPIO to use gpiolibs open drain
2017-10-30 0:28 ` Wolfram Sang
@ 2017-10-30 7:52 ` Linus Walleij
2017-11-01 22:45 ` Wolfram Sang
0 siblings, 1 reply; 16+ messages in thread
From: Linus Walleij @ 2017-10-30 7:52 UTC (permalink / raw)
To: Wolfram Sang; +Cc: linux-i2c
On Mon, Oct 30, 2017 at 1:28 AM, Wolfram Sang <wsa@the-dreams.de> wrote:
>> don't get ACKs for Blackfin these days, but there is still some MIPS and
>> MFD ack missing? Can you ping them again?
>
> Update: Lee's ack is already collected and Ralf acked V1 of this series.
> Did you miss to include it in v3? Or did the patch change so much?
Their ACKs are on the relevant patches on the git branch AFAICT
but if you want I can resend the patches too.
BTW my branch contains my changelogs as well,
so it should be edited to remove those (below the ---)
for convenience I also published a branch without them:
git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio.git for-wolfram
If you want to pull from my tree, take this :)
Yours,
Linus Walleij
^ permalink raw reply [flat|nested] 16+ messages in thread
* Re: [PATCH 0/7 v3] I2C GPIO to use gpiolibs open drain
2017-10-30 7:52 ` Linus Walleij
@ 2017-11-01 22:45 ` Wolfram Sang
0 siblings, 0 replies; 16+ messages in thread
From: Wolfram Sang @ 2017-11-01 22:45 UTC (permalink / raw)
To: Linus Walleij; +Cc: linux-i2c
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> for convenience I also published a branch without them:
> git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio.git for-wolfram
Merged this one. Thanks!
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^ permalink raw reply [flat|nested] 16+ messages in thread
end of thread, other threads:[~2017-11-01 22:45 UTC | newest]
Thread overview: 16+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2017-10-05 11:03 [PATCH 0/7 v3] I2C GPIO to use gpiolibs open drain Linus Walleij
2017-10-05 11:03 ` [PATCH 1/7 v3] i2c: gpio: Convert to use descriptors Linus Walleij
2017-10-05 11:03 ` [PATCH 2/7 v3] gpio: Make it possible for consumers to enforce open drain Linus Walleij
2017-10-05 11:03 ` [PATCH 3/7 v3] i2c: gpio: Enforce open drain through gpiolib Linus Walleij
2017-10-05 11:03 ` [PATCH 4/7 v3] i2c: gpio: Augment all boardfiles to use open drain Linus Walleij
2017-10-05 11:03 ` [PATCH 5/7 v3] i2c: gpio: Local vars in probe Linus Walleij
[not found] ` <20171005110310.5900-1-linus.walleij-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
2017-10-05 11:03 ` [PATCH 6/7 v3] dt-bindings: i2c: i2c-gpio: Add support for named gpios Linus Walleij
2017-10-05 11:03 ` [PATCH 7/7 v3] i2c: gpio: Add support for named gpios in DT Linus Walleij
2017-10-19 14:37 ` [PATCH 0/7 v3] I2C GPIO to use gpiolibs open drain Linus Walleij
2017-10-19 14:40 ` Wolfram Sang
2017-10-27 13:49 ` Wolfram Sang
2017-10-30 0:28 ` Wolfram Sang
2017-10-30 7:52 ` Linus Walleij
2017-11-01 22:45 ` Wolfram Sang
2017-10-27 13:55 ` Wolfram Sang
2017-10-29 23:19 ` Linus Walleij
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