From: Rajan Vaja Date: Thu, 5 Dec 2019 06:35:56 +0000 (-0800) Subject: clk: zynqmp: Warn user if clock user are more than allowed X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=df2a4d94f1720e24643a9870a01a1c2895d13b20;p=linux.git 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 Signed-off-by: Rajan Vaja Link: https://lkml.kernel.org/r/1575527759-26452-4-git-send-email-rajan.vaja@xilinx.com Acked-by: Michal Simek Signed-off-by: Stephen Boyd --- diff --git a/drivers/clk/zynqmp/pll.c b/drivers/clk/zynqmp/pll.c index a541397a172c8..89b5995301051 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; diff --git a/drivers/firmware/xilinx/zynqmp.c b/drivers/firmware/xilinx/zynqmp.c index 75bdfaa083800..74d9f13d72c45 100644 --- a/drivers/firmware/xilinx/zynqmp.c +++ b/drivers/firmware/xilinx/zynqmp.c @@ -48,6 +48,8 @@ static int zynqmp_pm_ret_code(u32 ret_status) return -EACCES; case XST_PM_ABORT_SUSPEND: return -ECANCELED; + case XST_PM_MULT_USER: + return -EUSERS; case XST_PM_INTERNAL: case XST_PM_CONFLICT: case XST_PM_INVALID_NODE: diff --git a/include/linux/firmware/xlnx-zynqmp.h b/include/linux/firmware/xlnx-zynqmp.h index e41ad9e371360..1827d30e86f16 100644 --- a/include/linux/firmware/xlnx-zynqmp.h +++ b/include/linux/firmware/xlnx-zynqmp.h @@ -89,6 +89,7 @@ enum pm_ret_status { XST_PM_INVALID_NODE, XST_PM_DOUBLE_REQ, XST_PM_ABORT_SUSPEND, + XST_PM_MULT_USER = 2008, }; enum pm_ioctl_id {