diff options
| author |   Gregory CLEMENT <gregory.clement@bootlin.com> | 2018-02-28 15:27:23 +0100 |
|---|---|---|
| committer |   Herbert Xu <herbert@gondor.apana.org.au> | 2018-03-09 22:45:45 +0800 |
| commit | b166be0044913a4ce03564e7c81f172025d78867 (patch) | |
| tree | c9fb534a996380303457673a28e9babff26c4d4e /drivers/char | |
| parent | hwrng: omap - Remove useless test before clk_disable_unprepare (diff) | |
| download | linux-dev-b166be0044913a4ce03564e7c81f172025d78867.tar.xz linux-dev-b166be0044913a4ce03564e7c81f172025d78867.zip | |
hwrng: omap - Fix clock resource by adding a register clock
On Armada 7K/8K we need to explicitly enable the register clock. This
clock is optional because not all the SoCs using this IP need it but at
least for Armada 7K/8K it is actually mandatory.
The binding documentation is updating accordingly.
Signed-off-by: Gregory CLEMENT <gregory.clement@bootlin.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'drivers/char')
| -rw-r--r-- | drivers/char/hw_random/omap-rng.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/drivers/char/hw_random/omap-rng.c b/drivers/char/hw_random/omap-rng.c index 159d4a1347b8..b65ff6962899 100644 --- a/drivers/char/hw_random/omap-rng.c +++ b/drivers/char/hw_random/omap-rng.c @@ -150,6 +150,7 @@ struct omap_rng_dev { const struct omap_rng_pdata *pdata; struct hwrng rng; struct clk *clk; + struct clk *clk_reg; }; static inline u32 omap_rng_read(struct omap_rng_dev *priv, u16 reg) @@ -480,6 +481,19 @@ static int omap_rng_probe(struct platform_device *pdev) } } + priv->clk_reg = devm_clk_get(&pdev->dev, "reg"); + if (IS_ERR(priv->clk_reg) && PTR_ERR(priv->clk_reg) == -EPROBE_DEFER) + return -EPROBE_DEFER; + if (!IS_ERR(priv->clk_reg)) { + ret = clk_prepare_enable(priv->clk_reg); + if (ret) { + dev_err(&pdev->dev, + "Unable to enable the register clk: %d\n", + ret); + goto err_register; + } + } + ret = (dev->of_node) ? of_get_omap_rng_device_details(priv, pdev) : get_omap_rng_device_details(priv); if (ret) @@ -499,6 +513,7 @@ err_register: pm_runtime_put_sync(&pdev->dev); pm_runtime_disable(&pdev->dev); + clk_disable_unprepare(priv->clk_reg); clk_disable_unprepare(priv->clk); err_ioremap: dev_err(dev, "initialization failed.\n"); @@ -517,6 +532,7 @@ static int omap_rng_remove(struct platform_device *pdev) pm_runtime_disable(&pdev->dev); clk_disable_unprepare(priv->clk); + clk_disable_unprepare(priv->clk_reg); return 0; } |