From: Vitor Soares <vitor.soares@synopsys.com>
To: linux-iio@vger.kernel.org, linux-i3c@lists.infradead.org,
linux-kernel@vger.kernel.org
Cc: lars@metafoo.de, bbrezillon@kernel.org,
gregkh@linuxfoundation.org, joao.pinto@synopsys.com,
rafael@kernel.org, Vitor Soares <vitor.soares@synopsys.com>,
broonie@kernel.org, pmeerw@pmeerw.net, knaack.h@gmx.de,
lorenzo.bianconi83@gmail.com, jic23@kernel.org
Subject: [PATCH 1/3] remap: Add I3C bus support
Date: Mon, 15 Apr 2019 21:19:39 +0200 [thread overview]
Message-ID: <c38e3cb9e8524af58c995a9cf1f79ddba69b47b4.1555354268.git.vitor.soares@synopsys.com> (raw)
In-Reply-To: <cover.1555354268.git.vitor.soares@synopsys.com>
In-Reply-To: <cover.1555354268.git.vitor.soares@synopsys.com>
Add basic support for I3C bus.
This is a simple implementation that only give support
for Read and Write commands.
Signed-off-by: Vitor Soares <vitor.soares@synopsys.com>
---
drivers/base/regmap/Kconfig | 6 +++-
drivers/base/regmap/Makefile | 1 +
drivers/base/regmap/regmap-i3c.c | 62 ++++++++++++++++++++++++++++++++++++++++
include/linux/regmap.h | 20 +++++++++++++
4 files changed, 88 insertions(+), 1 deletion(-)
create mode 100644 drivers/base/regmap/regmap-i3c.c
diff --git a/drivers/base/regmap/Kconfig b/drivers/base/regmap/Kconfig
index 6ad5ef4..c8bbf53 100644
--- a/drivers/base/regmap/Kconfig
+++ b/drivers/base/regmap/Kconfig
@@ -4,7 +4,7 @@
# subsystems should select the appropriate symbols.
config REGMAP
- default y if (REGMAP_I2C || REGMAP_SPI || REGMAP_SPMI || REGMAP_W1 || REGMAP_AC97 || REGMAP_MMIO || REGMAP_IRQ)
+ default y if (REGMAP_I2C || REGMAP_SPI || REGMAP_SPMI || REGMAP_W1 || REGMAP_AC97 || REGMAP_MMIO || REGMAP_IRQ || REGMAP_I3C)
select IRQ_DOMAIN if REGMAP_IRQ
bool
@@ -49,3 +49,7 @@ config REGMAP_SOUNDWIRE
config REGMAP_SCCB
tristate
depends on I2C
+
+config REGMAP_I3C
+ tristate
+ depends on I3C
diff --git a/drivers/base/regmap/Makefile b/drivers/base/regmap/Makefile
index f5b4e88..ff6c7d8 100644
--- a/drivers/base/regmap/Makefile
+++ b/drivers/base/regmap/Makefile
@@ -16,3 +16,4 @@ obj-$(CONFIG_REGMAP_IRQ) += regmap-irq.o
obj-$(CONFIG_REGMAP_W1) += regmap-w1.o
obj-$(CONFIG_REGMAP_SOUNDWIRE) += regmap-sdw.o
obj-$(CONFIG_REGMAP_SCCB) += regmap-sccb.o
+obj-$(CONFIG_REGMAP_I3C) += regmap-i3c.o
diff --git a/drivers/base/regmap/regmap-i3c.c b/drivers/base/regmap/regmap-i3c.c
new file mode 100644
index 0000000..565997b
--- /dev/null
+++ b/drivers/base/regmap/regmap-i3c.c
@@ -0,0 +1,62 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2018 Synopsys, Inc. and/or its affiliates.
+ *
+ * Author: Vitor Soares <vitor.soares@synopsys.com>
+ */
+
+#include <linux/regmap.h>
+#include <linux/i3c/device.h>
+#include <linux/i3c/master.h>
+#include <linux/module.h>
+
+static int regmap_i3c_write(void *context, const void *data, size_t count)
+{
+ struct device *dev = context;
+ struct i3c_device *i3c = dev_to_i3cdev(dev);
+ struct i3c_priv_xfer xfers[] = {
+ {
+ .rnw = false,
+ .len = count,
+ .data.out = data,
+ },
+ };
+
+ return i3c_device_do_priv_xfers(i3c, xfers, 1);
+}
+
+static int regmap_i3c_read(void *context,
+ const void *reg, size_t reg_size,
+ void *val, size_t val_size)
+{
+ struct device *dev = context;
+ struct i3c_device *i3c = dev_to_i3cdev(dev);
+ struct i3c_priv_xfer xfers[2];
+
+ xfers[0].rnw = false;
+ xfers[0].len = reg_size;
+ xfers[0].data.out = reg;
+
+ xfers[1].rnw = true;
+ xfers[1].len = val_size;
+ xfers[1].data.in = val;
+
+ return i3c_device_do_priv_xfers(i3c, xfers, 2);
+}
+
+static struct regmap_bus regmap_i3c = {
+ .write = regmap_i3c_write,
+ .read = regmap_i3c_read,
+};
+
+struct regmap *__devm_regmap_init_i3c(struct i3c_device *i3c,
+ const struct regmap_config *config,
+ struct lock_class_key *lock_key,
+ const char *lock_name)
+{
+ return __devm_regmap_init(&i3c->dev, ®map_i3c, &i3c->dev, config,
+ lock_key, lock_name);
+}
+EXPORT_SYMBOL_GPL(__devm_regmap_init_i3c);
+
+MODULE_LICENSE("GPL");
diff --git a/include/linux/regmap.h b/include/linux/regmap.h
index daeec7d..f65984d 100644
--- a/include/linux/regmap.h
+++ b/include/linux/regmap.h
@@ -25,6 +25,7 @@ struct module;
struct clk;
struct device;
struct i2c_client;
+struct i3c_device;
struct irq_domain;
struct slim_device;
struct spi_device;
@@ -624,6 +625,10 @@ struct regmap *__devm_regmap_init_slimbus(struct slim_device *slimbus,
const struct regmap_config *config,
struct lock_class_key *lock_key,
const char *lock_name);
+struct regmap *__devm_regmap_init_i3c(struct i3c_device *i3c,
+ const struct regmap_config *config,
+ struct lock_class_key *lock_key,
+ const char *lock_name);
/*
* Wrapper for regmap_init macros to include a unique lockdep key and name
* for each call. No-op if CONFIG_LOCKDEP is not set.
@@ -982,6 +987,21 @@ bool regmap_ac97_default_volatile(struct device *dev, unsigned int reg);
#define devm_regmap_init_slimbus(slimbus, config) \
__regmap_lockdep_wrapper(__devm_regmap_init_slimbus, #config, \
slimbus, config)
+
+/**
+ * devm_regmap_init_i3c() - Initialise managed register map
+ *
+ * @i3c: Device that will be interacted with
+ * @config: Configuration for register map
+ *
+ * The return value will be an ERR_PTR() on error or a valid pointer
+ * to a struct regmap. The regmap will be automatically freed by the
+ * device management code.
+ */
+#define devm_regmap_init_i3c(i3c, config) \
+ __regmap_lockdep_wrapper(__devm_regmap_init_i3c, #config, \
+ i3c, config)
+
int regmap_mmio_attach_clk(struct regmap *map, struct clk *clk);
void regmap_mmio_detach_clk(struct regmap *map);
void regmap_exit(struct regmap *map);
--
2.7.4
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next prev parent reply other threads:[~2019-04-16 11:12 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-15 19:19 [PATCH 0/3] Add ST lsm6dso i3c suppport Vitor Soares
2019-04-15 19:19 ` Vitor Soares [this message]
2019-04-16 6:15 ` [PATCH 1/3] remap: Add I3C bus support Boris Brezillon
2019-04-16 14:41 ` Vitor Soares
[not found] ` <20190416153948.GF4834@sirena.org.uk>
2019-04-23 14:58 ` Vitor Soares
2019-04-23 15:14 ` Boris Brezillon
2019-04-23 15:55 ` Vitor Soares
2019-04-15 19:19 ` [PATCH 2/3] i3c: Add i3c_get_device_id helper Vitor Soares
2019-04-16 6:18 ` Boris Brezillon
2019-04-16 14:48 ` Vitor Soares
2019-04-15 19:19 ` [PATCH 3/3] iio: imu: st_lsm6dsx: Add i3c basic support Vitor Soares
2019-04-15 22:17 ` Lorenzo Bianconi
2019-04-16 13:53 ` Vitor Soares
2019-04-16 6:25 ` Boris Brezillon
2019-04-16 7:58 ` Lorenzo Bianconi
2019-04-16 8:05 ` Boris Brezillon
2019-04-16 15:00 ` Vitor Soares
2019-04-16 15:02 ` Vitor Soares
2019-04-16 6:32 ` [PATCH 0/3] Add ST lsm6dso i3c suppport Boris Brezillon
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