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Subject[PATCH 3/6] nvmem: sunxi_sid: Dynamically allocate nvmem_config structure
Date
From: Chen-Yu Tsai <wens@csie.org>

The sunxi_sid driver currently uses a statically allocated nvmem_config
structure that is updated at probe time. This is sub-optimal as it
limits the driver to one instance, and also takes up space even if the
device is not present.

Modify the driver to allocate the nvmem_config structure at probe time,
plugging in the desired parameters along the way.

Signed-off-by: Chen-Yu Tsai <wens@csie.org>
---
drivers/nvmem/sunxi_sid.c | 32 +++++++++++++++++---------------
1 file changed, 17 insertions(+), 15 deletions(-)

diff --git a/drivers/nvmem/sunxi_sid.c b/drivers/nvmem/sunxi_sid.c
index 15fbfab62595..75c1f48cb3d0 100644
--- a/drivers/nvmem/sunxi_sid.c
+++ b/drivers/nvmem/sunxi_sid.c
@@ -35,13 +35,6 @@
#define SUN8I_SID_OP_LOCK (0xAC << 8)
#define SUN8I_SID_READ BIT(1)

-static struct nvmem_config econfig = {
- .name = "sunxi-sid",
- .read_only = true,
- .stride = 4,
- .word_size = 1,
-};
-
struct sunxi_sid_cfg {
u32 value_offset;
u32 size;
@@ -150,6 +143,7 @@ static int sunxi_sid_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct resource *res;
+ struct nvmem_config *nvmem_cfg;
struct nvmem_device *nvmem;
struct sunxi_sid *sid;
int size;
@@ -172,14 +166,23 @@ static int sunxi_sid_probe(struct platform_device *pdev)

size = cfg->size;

- econfig.size = size;
- econfig.dev = dev;
+ nvmem_cfg = devm_kzalloc(dev, sizeof(*nvmem_cfg), GFP_KERNEL);
+ if (!nvmem_cfg)
+ return -ENOMEM;
+
+ nvmem_cfg->dev = dev;
+ nvmem_cfg->name = "sunxi-sid";
+ nvmem_cfg->read_only = true;
+ nvmem_cfg->size = cfg->size;
+ nvmem_cfg->word_size = 1;
+ nvmem_cfg->stride = 4;
+ nvmem_cfg->priv = sid;
if (cfg->need_register_readout)
- econfig.reg_read = sun8i_sid_read_by_reg;
+ nvmem_cfg->reg_read = sun8i_sid_read_by_reg;
else
- econfig.reg_read = sunxi_sid_read;
- econfig.priv = sid;
- nvmem = devm_nvmem_register(dev, &econfig);
+ nvmem_cfg->reg_read = sunxi_sid_read;
+
+ nvmem = devm_nvmem_register(dev, nvmem_cfg);
if (IS_ERR(nvmem))
return PTR_ERR(nvmem);

@@ -187,8 +190,7 @@ static int sunxi_sid_probe(struct platform_device *pdev)
if (!randomness)
return -ENOMEM;

- econfig.reg_read(sid, 0, randomness, size);
-
+ nvmem_cfg->reg_read(sid, 0, randomness, size);
add_device_randomness(randomness, size);
kfree(randomness);

--
2.20.1
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