linux-kernel - RE: [PATCH] clk: imx: introduce imx_clk_hw

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Date:   Thu, 23 Apr 2020 10:42:31 +0000
From:   Aisheng Dong <aisheng.dong@....com>
To:     Peng Fan <peng.fan@....com>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "sboyd@...nel.org" <sboyd@...nel.org>
CC:     "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "festevam@...il.com" <festevam@...il.com>,
        dl-linux-imx <linux-imx@....com>,
        Anson Huang <anson.huang@....com>,
        Abel Vesa <abel.vesa@....com>,
        "linux-clk@...r.kernel.org" <linux-clk@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] clk: imx: introduce imx_clk_hw_critical

> From: Peng Fan <peng.fan@....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@....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