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Subject[PATCH v3 2/3] libnvdimm/of_pmem: handle memory-region in DT
From
From: Kenny Root <kroot@google.com>

Add support for parsing the 'memory-region' DT property in addition to
the 'reg' DT property. This enables use cases where the pmem region is
not in I/O address space or dedicated memory (e.g. a bootloader
carveout).

Signed-off-by: Kenny Root <kroot@google.com>
Signed-off-by: Alistair Delva <adelva@google.com>
Reviewed-by: "Oliver O'Halloran" <oohall@gmail.com>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Vishal Verma <vishal.l.verma@intel.com>
Cc: Dave Jiang <dave.jiang@intel.com>
Cc: Ira Weiny <ira.weiny@intel.com>
Cc: devicetree@vger.kernel.org
Cc: linux-nvdimm@lists.01.org
Cc: kernel-team@android.com
---
[v3: adelva: remove duplicate "From:"]
drivers/nvdimm/of_pmem.c | 20 ++++++++++++++++++--
1 file changed, 18 insertions(+), 2 deletions(-)

diff --git a/drivers/nvdimm/of_pmem.c b/drivers/nvdimm/of_pmem.c
index fdf54494e8c9..cff47cc5fc4a 100644
--- a/drivers/nvdimm/of_pmem.c
+++ b/drivers/nvdimm/of_pmem.c
@@ -49,11 +49,12 @@ static void of_pmem_register_region(struct platform_device *pdev,

static int of_pmem_region_probe(struct platform_device *pdev)
{
+ struct device_node *mr_np, *np;
struct of_pmem_private *priv;
- struct device_node *np;
struct nvdimm_bus *bus;
+ struct resource res;
bool is_volatile;
- int i;
+ int i, ret;

np = dev_of_node(&pdev->dev);
if (!np)
@@ -83,6 +84,21 @@ static int of_pmem_region_probe(struct platform_device *pdev)
is_volatile);
}

+ i = 0;
+ while ((mr_np = of_parse_phandle(np, "memory-region", i++))) {
+ ret = of_address_to_resource(mr_np, 0, &res);
+ if (ret) {
+ dev_warn(
+ &pdev->dev,
+ "Unable to acquire memory-region from %pOF: %d\n",
+ mr_np, ret);
+ } else {
+ of_pmem_register_region(pdev, bus, np, &res,
+ is_volatile);
+ }
+ of_node_put(mr_np);
+ }
+
return 0;
}

--
2.25.0.265.gbab2e86ba0-goog
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