lkml.org 
[lkml]   [2015]   [Feb]   [24]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    From
    Subject[PATCH v3 3/4] clk: Provide an always-on clock domain framework
    Date
    Lots of platforms contain clocks which if turned off would prove fatal.
    The only way to recover is to restart the board(s). This driver takes
    references to clocks which are required to be always-on in order to
    prevent the common clk framework from trying to turn them off during
    the clk_disabled_unused() procedure.

    Signed-off-by: Lee Jones <lee.jones@linaro.org>
    ---
    drivers/clk/Makefile | 1 +
    drivers/clk/clk-always-on.c | 62 +++++++++++++++++++++++++++++++++++++++++++++
    2 files changed, 63 insertions(+)
    create mode 100644 drivers/clk/clk-always-on.c

    diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
    index d478ceb..0d42541 100644
    --- a/drivers/clk/Makefile
    +++ b/drivers/clk/Makefile
    @@ -3,6 +3,7 @@ obj-$(CONFIG_HAVE_CLK) += clk-devres.o
    obj-$(CONFIG_CLKDEV_LOOKUP) += clkdev.o
    obj-$(CONFIG_COMMON_CLK) += clk.o
    obj-$(CONFIG_COMMON_CLK) += clk-divider.o
    +obj-$(CONFIG_COMMON_CLK) += clk-always-on.o
    obj-$(CONFIG_COMMON_CLK) += clk-fixed-factor.o
    obj-$(CONFIG_COMMON_CLK) += clk-fixed-rate.o
    obj-$(CONFIG_COMMON_CLK) += clk-gate.o
    diff --git a/drivers/clk/clk-always-on.c b/drivers/clk/clk-always-on.c
    new file mode 100644
    index 0000000..f3d90ac
    --- /dev/null
    +++ b/drivers/clk/clk-always-on.c
    @@ -0,0 +1,62 @@
    +/*
    + * Always-on Clock Domain
    + *
    + * Copyright (C) 2015 STMicroelectronics – All Rights Reserved
    + *
    + * Author: Lee Jones <lee.jones@linaro.org>
    + *
    + * This program is free software; you can redistribute it and/or modify
    + * it under the terms of the GNU General Public License as published by
    + * the Free Software Foundation; either version 2 of the License, or
    + * (at your option) any later version.
    + */
    +
    +#include <linux/clk-provider.h>
    +#include <linux/of_address.h>
    +#include <linux/of.h>
    +#include <linux/platform_device.h>
    +
    +static void ao_clock_domain_hog_clock(struct platform_device *pdev, int index)
    +{
    + struct device_node *np = pdev->dev.of_node;
    + struct clk *clk;
    + int ret;
    +
    + clk = of_clk_get(np, index);
    + if (IS_ERR(clk)) {
    + dev_warn(&pdev->dev, "Failed get clock %s[%d]: %li\n",
    + np->full_name, index, PTR_ERR(clk));
    + return;
    + }
    +
    + ret = clk_prepare_enable(clk);
    + if (ret)
    + dev_warn(&pdev->dev, "Failed to enable clock: %s\n", __clk_get_name(clk));
    +}
    +
    +static int ao_clock_domain_probe(struct platform_device *pdev)
    +{
    + struct device_node *np = pdev->dev.of_node;
    + int nclks, i;
    +
    + nclks = of_count_phandle_with_args(np, "clocks", "#clock-cells");
    +
    + for (i = 0; i < nclks; i++)
    + ao_clock_domain_hog_clock(pdev, i);
    +
    + return 0;
    +}
    +
    +static const struct of_device_id ao_clock_domain_match[] = {
    + { .compatible = "clk-always-on" },
    + { },
    +};
    +
    +static struct platform_driver ao_clock_domain_driver = {
    + .probe = ao_clock_domain_probe,
    + .driver = {
    + .name = "clk-always-on",
    + .of_match_table = ao_clock_domain_match,
    + },
    +};
    +module_platform_driver(ao_clock_domain_driver);
    --
    1.9.1


    \
     
     \ /
      Last update: 2015-02-24 18:41    [W:3.586 / U:0.504 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site