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SubjectRE: [PATCH] clk: imx: introduce imx_clk_hw_critical
Date
> Subject: RE: [PATCH] clk: imx: introduce imx_clk_hw_critical
>
> > 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?

I think clock-critical is a common bindings? See of_clk_detect_critical.
Please review whether this approach is acceptable, if do
need bindings, I could add that in v2.

Thanks,
Peng.

>
> 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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