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| author | Rafał Miłecki <rafal@milecki.pl> | 2023-06-11 16:03:29 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-06-15 13:42:18 +0200 |
| commit | 27f699e578b1a72df89dfa3bc42e093a01dc8d10 (patch) | |
| tree | 477938be8ec3330a3ed1b39bddf58628775cba43 /drivers/nvmem | |
| parent | dt-bindings: nvmem: convert base example to use NVMEM fixed cells layout (diff) | |
| download | linux-27f699e578b1a72df89dfa3bc42e093a01dc8d10.tar.xz linux-27f699e578b1a72df89dfa3bc42e093a01dc8d10.zip | |
nvmem: core: add support for fixed cells *layout*
This adds support for the "fixed-layout" NVMEM layout binding. It allows
defining NVMEM cells in a layout DT node named "nvmem-layout".
While NVMEM subsystem supports layout drivers it has been discussed that
"fixed-layout" may actually be supperted internally. It's because:
1. It's a very basic layout
2. It allows sharing code with legacy syntax parsing
3. It's safer for soc_device_match() due to -EPROBE_DEFER
4. This will make the syntax transition easier
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Reviewed-by: Michael Walle <michael@walle.cc>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Message-ID: <20230611140330.154222-26-srinivas.kandagatla@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/nvmem')
| -rw-r--r-- | drivers/nvmem/core.c | 32 |
1 files changed, 29 insertions, 3 deletions
diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c index 342cd380b420..3f8c7718412b 100644 --- a/drivers/nvmem/core.c +++ b/drivers/nvmem/core.c @@ -696,7 +696,7 @@ static int nvmem_validate_keepouts(struct nvmem_device *nvmem) return 0; } -static int nvmem_add_cells_from_of(struct nvmem_device *nvmem) +static int nvmem_add_cells_from_dt(struct nvmem_device *nvmem, struct device_node *np) { struct nvmem_layout *layout = nvmem->layout; struct device *dev = &nvmem->dev; @@ -704,7 +704,7 @@ static int nvmem_add_cells_from_of(struct nvmem_device *nvmem) const __be32 *addr; int len, ret; - for_each_child_of_node(dev->of_node, child) { + for_each_child_of_node(np, child) { struct nvmem_cell_info info = {0}; addr = of_get_property(child, "reg", &len); @@ -742,6 +742,28 @@ static int nvmem_add_cells_from_of(struct nvmem_device *nvmem) return 0; } +static int nvmem_add_cells_from_legacy_of(struct nvmem_device *nvmem) +{ + return nvmem_add_cells_from_dt(nvmem, nvmem->dev.of_node); +} + +static int nvmem_add_cells_from_fixed_layout(struct nvmem_device *nvmem) +{ + struct device_node *layout_np; + int err = 0; + + layout_np = of_nvmem_layout_get_container(nvmem); + if (!layout_np) + return 0; + + if (of_device_is_compatible(layout_np, "fixed-layout")) + err = nvmem_add_cells_from_dt(nvmem, layout_np); + + of_node_put(layout_np); + + return err; +} + int __nvmem_layout_register(struct nvmem_layout *layout, struct module *owner) { layout->owner = owner; @@ -972,7 +994,7 @@ struct nvmem_device *nvmem_register(const struct nvmem_config *config) if (rval) goto err_remove_cells; - rval = nvmem_add_cells_from_of(nvmem); + rval = nvmem_add_cells_from_legacy_of(nvmem); if (rval) goto err_remove_cells; @@ -982,6 +1004,10 @@ struct nvmem_device *nvmem_register(const struct nvmem_config *config) if (rval) goto err_remove_cells; + rval = nvmem_add_cells_from_fixed_layout(nvmem); + if (rval) + goto err_remove_cells; + rval = nvmem_add_cells_from_layout(nvmem); if (rval) goto err_remove_cells; |