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authorJerome Brunet <jbrunet@baylibre.com>2018-11-30 14:53:23 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-12-06 17:45:46 +0300
commit611fbca1c861976e95a5244acf9f40bb0981977c (patch)
tree96ab17b34631148f1f93548c5ba69d6c17537f60 /drivers/nvmem
parenta91ae340ad05c24b921f433357ca82a83480ce95 (diff)
downloadlinux-611fbca1c861976e95a5244acf9f40bb0981977c.tar.xz
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>
Diffstat (limited to 'drivers/nvmem')
-rw-r--r--drivers/nvmem/meson-efuse.c25
1 files changed, 25 insertions, 0 deletions
diff --git a/drivers/nvmem/meson-efuse.c b/drivers/nvmem/meson-efuse.c
index 40b9df1d030d..99372768446b 100644
--- a/drivers/nvmem/meson-efuse.c
+++ b/drivers/nvmem/meson-efuse.c
@@ -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");