lkml.org 
[lkml]   [2022]   [Aug]   [14]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    From
    Subject[PATCH 2/2] clk: imx: support fsl,protected-clocks
    Date
    From: Peng Fan <peng.fan@nxp.com>

    For the clocks listed in fsl,protected-clocks, enable them to avoid
    Linux disable them. This will benifit root Linux and inmate cell run
    on top of Jailhouse hypervisor, and benifit AMP case.

    Signed-off-by: Peng Fan <peng.fan@nxp.com>
    ---
    drivers/clk/imx/clk-imx8mm.c | 2 ++
    drivers/clk/imx/clk-imx8mn.c | 2 ++
    drivers/clk/imx/clk-imx8mp.c | 2 ++
    drivers/clk/imx/clk-imx8mq.c | 2 ++
    drivers/clk/imx/clk.c | 21 +++++++++++++++++++++
    drivers/clk/imx/clk.h | 2 ++
    6 files changed, 31 insertions(+)

    diff --git a/drivers/clk/imx/clk-imx8mm.c b/drivers/clk/imx/clk-imx8mm.c
    index b6d275855b36..24ddb1620bce 100644
    --- a/drivers/clk/imx/clk-imx8mm.c
    +++ b/drivers/clk/imx/clk-imx8mm.c
    @@ -611,6 +611,8 @@ static int imx8mm_clocks_probe(struct platform_device *pdev)

    imx_register_uart_clocks(4);

    + imx_clk_protect(dev, hws);
    +
    return 0;

    unregister_hws:
    diff --git a/drivers/clk/imx/clk-imx8mn.c b/drivers/clk/imx/clk-imx8mn.c
    index d37c45b676ab..57c486317d28 100644
    --- a/drivers/clk/imx/clk-imx8mn.c
    +++ b/drivers/clk/imx/clk-imx8mn.c
    @@ -604,6 +604,8 @@ static int imx8mn_clocks_probe(struct platform_device *pdev)

    imx_register_uart_clocks(4);

    + imx_clk_protect(dev, hws);
    +
    return 0;

    unregister_hws:
    diff --git a/drivers/clk/imx/clk-imx8mp.c b/drivers/clk/imx/clk-imx8mp.c
    index 652ae58c2735..a95862cc04a4 100644
    --- a/drivers/clk/imx/clk-imx8mp.c
    +++ b/drivers/clk/imx/clk-imx8mp.c
    @@ -713,6 +713,8 @@ static int imx8mp_clocks_probe(struct platform_device *pdev)

    imx_register_uart_clocks(4);

    + imx_clk_protect(dev, hws);
    +
    return 0;
    }

    diff --git a/drivers/clk/imx/clk-imx8mq.c b/drivers/clk/imx/clk-imx8mq.c
    index 882dcad4817d..2868e2390667 100644
    --- a/drivers/clk/imx/clk-imx8mq.c
    +++ b/drivers/clk/imx/clk-imx8mq.c
    @@ -603,6 +603,8 @@ static int imx8mq_clocks_probe(struct platform_device *pdev)

    imx_register_uart_clocks(4);

    + imx_clk_protect(dev, hws);
    +
    return 0;

    unregister_hws:
    diff --git a/drivers/clk/imx/clk.c b/drivers/clk/imx/clk.c
    index 5582f18dd632..307da8bd5243 100644
    --- a/drivers/clk/imx/clk.c
    +++ b/drivers/clk/imx/clk.c
    @@ -2,6 +2,7 @@
    #include <linux/bits.h>
    #include <linux/clk.h>
    #include <linux/clk-provider.h>
    +#include <linux/device.h>
    #include <linux/err.h>
    #include <linux/io.h>
    #include <linux/module.h>
    @@ -214,4 +215,24 @@ static int __init imx_clk_disable_uart(void)
    late_initcall_sync(imx_clk_disable_uart);
    #endif

    +int imx_clk_protect(struct device *dev, struct clk_hw * const clks[])
    +{
    + struct device_node *np = dev->of_node;
    + struct property *prop;
    + const __be32 *p;
    + u32 i;
    + int ret;
    +
    + of_property_for_each_u32(np, "fsl,protected-clocks", prop, p, i) {
    + ret = clk_prepare_enable(clks[i]->clk);
    + if (ret) {
    + dev_err(dev, "failed to enable %s\n", clk_hw_get_name(clks[i]));
    + return ret;
    + }
    + }
    +
    + return 0;
    +}
    +EXPORT_SYMBOL_GPL(imx_clk_protect);
    +
    MODULE_LICENSE("GPL v2");
    diff --git a/drivers/clk/imx/clk.h b/drivers/clk/imx/clk.h
    index dd49f90110e8..3f8099190b99 100644
    --- a/drivers/clk/imx/clk.h
    +++ b/drivers/clk/imx/clk.h
    @@ -22,6 +22,8 @@ void imx_mmdc_mask_handshake(void __iomem *ccm_base, unsigned int chn);
    void imx_unregister_clocks(struct clk *clks[], unsigned int count);
    void imx_unregister_hw_clocks(struct clk_hw *hws[], unsigned int count);

    +int imx_clk_protect(struct device *dev, struct clk_hw * const clks[]);
    +
    extern void imx_cscmr1_fixup(u32 *val);

    enum imx_pllv1_type {
    --
    2.37.1
    \
     
     \ /
      Last update: 2022-08-15 05:35    [W:3.516 / U:0.012 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site