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nvmem: sunxi_sid: Dynamically allocate nvmem_config structure 

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>
Acked-by: Maxime Ripard <maxime.ripard@bootlin.com>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Chen-Yu Tsai 2019-04-13 11:32:51 +01:00 committed by Greg Kroah-Hartman
parent de2a3eaea5
commit 7fa5ad23db
1 changed files with 17 additions and 15 deletions
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32
drivers/nvmem/sunxi_sid.c
View File

@ -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);