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lib: utils/regmap: Add simple FDT based regmap framework

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We add a simple FDT based regmap framework which is built on top of
generic regmap library. The phandle of FDT regmap DT node is treated
as unique regmap ID. The FDT based regmap drivers will be probed
on-demand from fdt_regmap_get_by_phandle() and fdt_regmap_get()
called by the regmap client drivers.

Signed-off-by: Anup Patel <apatel@ventanamicro.com>
Reviewed-by: Xiang W <wxjstz@126.com>
This commit is contained in:
Anup Patel
2023-07-21 13:39:57 +05:30
committed by Anup Patel
parent 14a35b0e0e
commit 8e97275d97
6 changed files with 138 additions and 1 deletions
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31
include/sbi_utils/regmap/fdt_regmap.h Normal file
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/*
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2023 Ventana Micro Systems Inc.
*
* Authors:
* Anup Patel <apatel@ventanamicro.com>
*/
#ifndef __FDT_REGMAP_H__
#define __FDT_REGMAP_H__
#include <sbi_utils/regmap/regmap.h>
struct fdt_phandle_args;
/** FDT based regmap driver */
struct fdt_regmap {
const struct fdt_match *match_table;
int (*init)(void *fdt, int nodeoff, u32 phandle,
const struct fdt_match *match);
};
/** Get regmap instance based on phandle */
int fdt_regmap_get_by_phandle(void *fdt, u32 phandle,
struct regmap **out_rmap);
/** Get regmap instance based on "regmap' property of the specified DT node */
int fdt_regmap_get(void *fdt, int nodeoff, struct regmap **out_rmap);
#endif