From: Ahmad Fatoum <a.fatoum@pengutronix.de> To: barebox@lists.infradead.org Cc: Ahmad Fatoum <a.fatoum@pengutronix.de> Subject: [PATCH 1/5] regmap: implement regmap_init_i2c Date: Mon, 31 May 2021 09:24:02 +0200 Message-ID: <20210531072406.5630-2-a.fatoum@pengutronix.de> (raw) In-Reply-To: <20210531072406.5630-1-a.fatoum@pengutronix.de> Linux offers a helper for creating regmaps over i2c. Add a similar helper for barebox to ease driver porting. Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de> --- drivers/base/regmap/Makefile | 1 + drivers/base/regmap/regmap-i2c.c | 44 ++++++++++++++++++++++++++++++++ include/regmap.h | 13 ++++++++++ 3 files changed, 58 insertions(+) create mode 100644 drivers/base/regmap/regmap-i2c.c diff --git a/drivers/base/regmap/Makefile b/drivers/base/regmap/Makefile index ab2387037d37..b12b69531156 100644 --- a/drivers/base/regmap/Makefile +++ b/drivers/base/regmap/Makefile @@ -1,2 +1,3 @@ obj-y += regmap.o obj-y += regmap-mmio.o +obj-$(CONFIG_I2C) += regmap-i2c.o diff --git a/drivers/base/regmap/regmap-i2c.c b/drivers/base/regmap/regmap-i2c.c new file mode 100644 index 000000000000..88b24ae6a825 --- /dev/null +++ b/drivers/base/regmap/regmap-i2c.c @@ -0,0 +1,44 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (c) 2021, Ahmad Fatoum, Pengutronix + */ + +#include <i2c/i2c.h> +#include <regmap.h> + + +static int regmap_i2c_reg_read(void *client, unsigned int reg, unsigned int *val) +{ + u8 buf[1]; + int ret; + + ret = i2c_read_reg(client, reg, buf, 1); + if (ret != 1) + return ret; + + *val = buf[0]; + return 0; +} + +static int regmap_i2c_reg_write(void *client, unsigned int reg, unsigned int val) +{ + u8 buf[] = { val & 0xff }; + int ret; + + ret = i2c_write_reg(client, reg, buf, 1); + if (ret != 1) + return ret; + + return 0; +} + +static const struct regmap_bus regmap_regmap_i2c_bus = { + .reg_write = regmap_i2c_reg_write, + .reg_read = regmap_i2c_reg_read, +}; + +struct regmap *regmap_init_i2c(struct i2c_client *client, + const struct regmap_config *config) +{ + return regmap_init(&client->dev, ®map_regmap_i2c_bus, client, config); +} diff --git a/include/regmap.h b/include/regmap.h index b43cd936fa61..c5cf954ad6d9 100644 --- a/include/regmap.h +++ b/include/regmap.h @@ -76,6 +76,19 @@ struct regmap *regmap_init_mmio_clk(struct device_d *dev, const char *clk_id, void __iomem *regs, const struct regmap_config *config); +/** + * regmap_init_i2c() - Initialise i2c register map + * + * @i2c: 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. + */ +struct i2c_client; +struct regmap *regmap_init_i2c(struct i2c_client *i2c, + const struct regmap_config *config); + /** * regmap_init_mmio() - Initialise register map * -- 2.29.2 _______________________________________________ barebox mailing list barebox@lists.infradead.org http://lists.infradead.org/mailman/listinfo/barebox
next prev parent reply other threads:[~2021-05-31 7:25 UTC|newest] Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-05-31 7:24 [PATCH 0/5] add regmap helpers for NVMEM and i2c Ahmad Fatoum 2021-05-31 7:24 ` Ahmad Fatoum [this message] 2021-05-31 7:24 ` [PATCH 2/5] mfd: stpmic1: simplify using regmap_init_i2c Ahmad Fatoum 2021-05-31 7:24 ` [PATCH 3/5] nvmem: provider: align read/write callback prototype with upstream Ahmad Fatoum 2021-05-31 7:24 ` [PATCH 4/5] nvmem: add nvmem_regmap_register helper Ahmad Fatoum 2021-05-31 7:24 ` [PATCH 5/5] nvmem: stm32-bsec: simplify using new nvmem_regmap_register Ahmad Fatoum 2021-06-02 6:36 ` [PATCH 0/5] add regmap helpers for NVMEM and i2c Sascha Hauer
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