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| author | Rajan Vaja <rajan.vaja@xilinx.com> | 2019-12-04 22:35:56 -0800 |
|---|---|---|
| committer | Stephen Boyd <sboyd@kernel.org> | 2020-01-23 13:25:25 -0800 |
| commit | df2a4d94f1720e24643a9870a01a1c2895d13b20 (patch) | |
| tree | 83ae937ad0cb575f5cf69f06e4bb89a38d0c8b67 /drivers/clk/zynqmp | |
| parent | c1e846b8ee5eee78765242fe204f566596c52ad1 (diff) | |
| download | linux-df2a4d94f1720e24643a9870a01a1c2895d13b20.tar.gz linux-df2a4d94f1720e24643a9870a01a1c2895d13b20.tar.bz2 linux-df2a4d94f1720e24643a9870a01a1c2895d13b20.zip | |
clk: zynqmp: Warn user if clock user are more than allowed
Warn user if clock is used by more than allowed devices.
This check is done by firmware and returns respective
error code. Upon receiving error code for excessive user,
warn user for the same.
This change is done to restrict VPLL use count. It is
assumed that VPLL is used by one user only.
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Rajan Vaja <rajan.vaja@xilinx.com>
Link: https://lkml.kernel.org/r/1575527759-26452-4-git-send-email-rajan.vaja@xilinx.com
Acked-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
Diffstat (limited to 'drivers/clk/zynqmp')
| -rw-r--r-- | drivers/clk/zynqmp/pll.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/clk/zynqmp/pll.c b/drivers/clk/zynqmp/pll.c index a541397a172c..89b599530105 100644 --- a/drivers/clk/zynqmp/pll.c +++ b/drivers/clk/zynqmp/pll.c @@ -188,10 +188,12 @@ static int zynqmp_pll_set_rate(struct clk_hw *hw, unsigned long rate, frac = (parent_rate * f) / FRAC_DIV; ret = eemi_ops->clock_setdivider(clk_id, m); - if (ret) + if (ret == -EUSERS) + WARN(1, "More than allowed devices are using the %s, which is forbidden\n", + clk_name); + else if (ret) pr_warn_once("%s() set divider failed for %s, ret = %d\n", __func__, clk_name, ret); - eemi_ops->ioctl(0, IOCTL_SET_PLL_FRAC_DATA, clk_id, f, NULL); return rate + frac; |