From patchwork Wed May 27 12:52:05 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pratyush Yadav X-Patchwork-Id: 246688 List-Id: U-Boot discussion From: p.yadav at ti.com (Pratyush Yadav) Date: Wed, 27 May 2020 18:22:05 +0530 Subject: [PATCH 5/8] regmap: Add regmap_init_mem_range() In-Reply-To: <20200527125208.24881-1-p.yadav@ti.com> References: <20200527125208.24881-1-p.yadav@ti.com> Message-ID: <20200527125208.24881-6-p.yadav@ti.com> Right now, the base of a regmap can only be obtained from the device tree. This makes it impossible for devices which calculate the base at runtime to use a regmap. An example of such a device is the Cadence Sierra PHY. Allow creating a regmap with one range whose start and size can be specified by the driver based on calculations at runtime. Signed-off-by: Pratyush Yadav Reviewed-by: Simon Glass --- drivers/core/regmap.c | 27 +++++++++++++++++++++++++++ include/regmap.h | 19 +++++++++++++++++++ 2 files changed, 46 insertions(+) diff --git a/drivers/core/regmap.c b/drivers/core/regmap.c index 8ba4270d2d..f019a4e9ce 100644 --- a/drivers/core/regmap.c +++ b/drivers/core/regmap.c @@ -160,6 +160,33 @@ err: return ret; } +int regmap_init_mem_range(ofnode node, ulong r_start, ulong r_size, + struct regmap **mapp) +{ + struct regmap *map; + struct regmap_range *range; + + map = regmap_alloc(1); + if (!map) + return -ENOMEM; + + range = &map->ranges[0]; + range->start = r_start; + range->size = r_size; + + if (ofnode_read_bool(node, "little-endian")) + map->endianness = REGMAP_LITTLE_ENDIAN; + else if (ofnode_read_bool(node, "big-endian")) + map->endianness = REGMAP_BIG_ENDIAN; + else if (ofnode_read_bool(node, "native-endian")) + map->endianness = REGMAP_NATIVE_ENDIAN; + else /* Default: native endianness */ + map->endianness = REGMAP_NATIVE_ENDIAN; + + *mapp = map; + return 0; +} + int regmap_init_mem(ofnode node, struct regmap **mapp) { struct regmap_range *range; diff --git a/include/regmap.h b/include/regmap.h index dacdf1f39b..ea6d8b253d 100644 --- a/include/regmap.h +++ b/include/regmap.h @@ -352,6 +352,25 @@ int regmap_init_mem_platdata(struct udevice *dev, fdt_val_t *reg, int count, int regmap_init_mem_index(ofnode node, struct regmap **mapp, int index); +/** + * regmap_init_mem_range() - Set up a new memory region for ofnode with the + * specified range. + * + * @node: The ofnode for the map. + * @r_start: Start of the range. + * @r_size: Size of the range. + * @mapp: Returns allocated map. + * + * Return: 0 in success, -errno otherwise + * + * This creates a regmap with one range where instead of extracting the range + * from 'node', it is created based on the parameters specified. This is + * useful when a driver needs to calculate the base of the regmap at runtime, + * and can't specify it in device tree. + */ +int regmap_init_mem_range(ofnode node, ulong r_start, ulong r_size, + struct regmap **mapp); + /** * devm_regmap_init() - Initialise register map (device managed) *