Messages in this thread | | | From | Peng Fan <> | Subject | RE: [PATCH] clk: imx: introduce imx_clk_hw_critical | Date | Thu, 23 Apr 2020 10:53:37 +0000 |
| |
> 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
| |