Messages in this thread | | | From | Aisheng Dong <> | Subject | RE: [PATCH] clk: imx: introduce imx_clk_hw_critical | Date | Thu, 23 Apr 2020 10:42:31 +0000 |
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> From: Peng Fan <peng.fan@nxp.com> > Sent: Thursday, April 23, 2020 2:52 PM > > To i.MX8M SoC, there is an case is when running dual OSes with hypervisor, the > clk of the hardware that passthrough to the 2nd OS needs to be setup by 1st > Linux OS. > So detect clock-critical from ccm node and enable the clocks to let the 2nd OS > could use the hardware without touch CCM module. > > Signed-off-by: Peng Fan <peng.fan@nxp.com> > --- > drivers/clk/imx/clk.c | 19 +++++++++++++++++++ drivers/clk/imx/clk.h | 1 > + > 2 files changed, 20 insertions(+) > > diff --git a/drivers/clk/imx/clk.c b/drivers/clk/imx/clk.c index > 87ab8db3d282..ec7d422540c1 100644 > --- a/drivers/clk/imx/clk.c > +++ b/drivers/clk/imx/clk.c > @@ -177,3 +177,22 @@ static int __init imx_clk_disable_uart(void) > return 0; > } > late_initcall_sync(imx_clk_disable_uart); > + > +int imx_clk_hw_critical(struct device_node *np, struct clk_hw * const > +hws[]) { > + struct property *prop; > + const __be32 *cur; > + u32 idx; > + int ret; > + > + if (!np || !hws) > + return -EINVAL; > + > + of_property_for_each_u32(np, "clock-critical", prop, cur, idx) {
Is there a binding for it already?
Regards Aisheng
> + ret = clk_prepare_enable(hws[idx]->clk); > + if (ret) > + return ret; > + } > + > + return 0; > +} > diff --git a/drivers/clk/imx/clk.h b/drivers/clk/imx/clk.h index > d4ea1609bcb7..701d7440f98c 100644 > --- a/drivers/clk/imx/clk.h > +++ b/drivers/clk/imx/clk.h > @@ -9,6 +9,7 @@ extern spinlock_t imx_ccm_lock; > > void imx_check_clocks(struct clk *clks[], unsigned int count); void > imx_check_clk_hws(struct clk_hw *clks[], unsigned int count); > +int imx_clk_hw_critical(struct device_node *np, struct clk_hw * const > +hws[]); > void imx_register_uart_clocks(struct clk ** const clks[]); void > imx_mmdc_mask_handshake(void __iomem *ccm_base, unsigned int chn); > void imx_unregister_clocks(struct clk *clks[], unsigned int count); > -- > 2.16.4
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