forked from Mirrors/opensbi
1f8db2f18f
The regmap driver subsystem does not need any extra data, so it can use `struct fdt_driver` directly. It always initializes the driver for a specific DT node. Signed-off-by: Samuel Holland <samuel.holland@sifive.com> Reviewed-by: Anup Patel <anup@brainfault.org>
72 lines
1.5 KiB
C
72 lines
1.5 KiB
C
/*
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2023 Ventana Micro Systems Inc.
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*
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* Authors:
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* Anup Patel <apatel@ventanamicro.com>
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*/
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#include <libfdt.h>
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#include <sbi/sbi_error.h>
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#include <sbi_utils/fdt/fdt_helper.h>
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#include <sbi_utils/regmap/fdt_regmap.h>
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/* List of FDT regmap drivers generated at compile time */
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extern const struct fdt_driver *const fdt_regmap_drivers[];
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static int fdt_regmap_find(const void *fdt, int nodeoff,
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struct regmap **out_rmap)
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{
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int rc;
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struct regmap *rmap = regmap_find(nodeoff);
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if (!rmap) {
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/* Regmap not found so initialize matching driver */
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rc = fdt_driver_init_by_offset(fdt, nodeoff,
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fdt_regmap_drivers);
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if (rc)
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return rc;
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/* Try to find regmap again */
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rmap = regmap_find(nodeoff);
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if (!rmap)
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return SBI_ENOSYS;
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}
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if (out_rmap)
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*out_rmap = rmap;
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return 0;
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}
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int fdt_regmap_get_by_phandle(const void *fdt, u32 phandle,
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struct regmap **out_rmap)
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{
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int pnodeoff;
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if (!fdt || !out_rmap)
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return SBI_EINVAL;
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pnodeoff = fdt_node_offset_by_phandle(fdt, phandle);
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if (pnodeoff < 0)
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return pnodeoff;
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return fdt_regmap_find(fdt, pnodeoff, out_rmap);
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}
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int fdt_regmap_get(const void *fdt, int nodeoff, struct regmap **out_rmap)
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{
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int len;
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const fdt32_t *val;
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if (!fdt || (nodeoff < 0) || !out_rmap)
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return SBI_EINVAL;
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val = fdt_getprop(fdt, nodeoff, "regmap", &len);
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if (!val)
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return SBI_ENOENT;
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return fdt_regmap_get_by_phandle(fdt, fdt32_to_cpu(*val), out_rmap);
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}
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