Commit df2a4d94 authored by Rajan Vaja's avatar Rajan Vaja Committed by Stephen Boyd
Browse files

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: default avatarMichal Simek <michal.simek@xilinx.com>
Signed-off-by: default avatarRajan Vaja <rajan.vaja@xilinx.com>
Link: https://lkml.kernel.org/r/1575527759-26452-4-git-send-email-rajan.vaja@xilinx.com


Acked-by: default avatarMichal Simek <michal.simek@xilinx.com>
Signed-off-by: default avatarStephen Boyd <sboyd@kernel.org>
parent c1e846b8

drivers/clk/zynqmp/pll.c

+4 −2
Original line number Diff line number Diff line
@@ -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;

drivers/firmware/xilinx/zynqmp.c

+2 −0
Original line number Diff line number Diff line
@@ -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:

include/linux/firmware/xlnx-zynqmp.h

+1 −0
Original line number Diff line number Diff line
@@ -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 {