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nvmem: meson-efuse: add peripheral clock 

Get and enable the peripheral clock required by the efuse device.
The driver has been handle to work without it so far because the
clock was left enabled by default but it won't be the case soon.

Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
hifive-unleashed-5.1
Jerome Brunet 2018-11-30 11:53:23 +00:00 committed by Greg Kroah-Hartman
parent a91ae340ad
commit 611fbca1c8
1 changed files with 25 additions and 0 deletions
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25
drivers/nvmem/meson-efuse.c
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@ -14,6 +14,7 @@
* more details.
*/
#include <linux/clk.h>
#include <linux/module.h>
#include <linux/nvmem-provider.h>
#include <linux/of.h>
@ -46,7 +47,31 @@ static int meson_efuse_probe(struct platform_device *pdev)
struct device *dev = &pdev->dev;
struct nvmem_device *nvmem;
struct nvmem_config *econfig;
struct clk *clk;
unsigned int size;
int ret;
clk = devm_clk_get(dev, NULL);
if (IS_ERR(clk)) {
ret = PTR_ERR(clk);
if (ret != -EPROBE_DEFER)
dev_err(dev, "failed to get efuse gate");
return ret;
}
ret = clk_prepare_enable(clk);
if (ret) {
dev_err(dev, "failed to enable gate");
return ret;
}
ret = devm_add_action_or_reset(dev,
(void(*)(void *))clk_disable_unprepare,
clk);
if (ret) {
dev_err(dev, "failed to add disable callback");
return ret;
}
if (meson_sm_call(SM_EFUSE_USER_MAX, &size, 0, 0, 0, 0, 0) < 0) {
dev_err(dev, "failed to get max user");