From: Aisheng Dong <aisheng.dong@nxp.com>
To: Peng Fan <peng.fan@nxp.com>,
"shawnguo@kernel.org" <shawnguo@kernel.org>,
"s.hauer@pengutronix.de" <s.hauer@pengutronix.de>,
"sboyd@kernel.org" <sboyd@kernel.org>
Cc: "kernel@pengutronix.de" <kernel@pengutronix.de>,
"festevam@gmail.com" <festevam@gmail.com>,
dl-linux-imx <linux-imx@nxp.com>,
Anson Huang <anson.huang@nxp.com>, Abel Vesa <abel.vesa@nxp.com>,
"linux-clk@vger.kernel.org" <linux-clk@vger.kernel.org>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: RE: [PATCH] clk: imx: introduce imx_clk_hw_critical
Date: Thu, 23 Apr 2020 10:42:31 +0000 [thread overview]
Message-ID: <AM6PR04MB4966934EE0411F7C3FF5AA2F80D30@AM6PR04MB4966.eurprd04.prod.outlook.com> (raw)
In-Reply-To: <1587624748-27228-1-git-send-email-peng.fan@nxp.com>
> 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
next prev parent reply other threads:[~2020-04-23 10:42 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-23 6:52 [PATCH] clk: imx: introduce imx_clk_hw_critical peng.fan
2020-04-23 10:42 ` Aisheng Dong [this message]
2020-04-23 10:53 ` Peng Fan
2020-04-23 14:03 ` Aisheng Dong
2020-04-24 1:07 ` Peng Fan
2020-04-24 1:59 ` Aisheng Dong
2020-04-24 2:02 ` Peng Fan
2020-04-27 8:43 ` Peng Fan
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