mirror of https://gitee.com/openkylin/linux.git
clk: shmobile: Add CPG/MSTP Clock Domain support
Add Clock Domain support to the Clock Pulse Generator (CPG) Module Stop (MSTP) Clocks driver using the generic PM Domain. This allows to power-manage the module clocks of SoC devices that are part of the CPG/MSTP Clock Domain using Runtime PM, or for system suspend/resume. SoC devices that are part of the CPG/MSTP Clock Domain and can be power-managed through an MSTP clock should be tagged in DT with a proper "power-domains" property. The CPG/MSTP Clock Domain code will scan such devices for clocks that are suitable for power-managing the device, by looking for a clock that is compatible with "renesas,cpg-mstp-clocks". Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Acked-by: Stephen Boyd <sboyd@codeaurora.org> Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org> Reviewed-by: Kevin Hilman <khilman@linaro.org> Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
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@ -2,6 +2,7 @@
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* R-Car MSTP clocks
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*
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* Copyright (C) 2013 Ideas On Board SPRL
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* Copyright (C) 2015 Glider bvba
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*
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* Contact: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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*
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@ -10,11 +11,16 @@
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* the Free Software Foundation; version 2 of the License.
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*/
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#include <linux/clk.h>
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#include <linux/clk-provider.h>
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#include <linux/clkdev.h>
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#include <linux/clk/shmobile.h>
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#include <linux/device.h>
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#include <linux/io.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <linux/pm_clock.h>
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#include <linux/pm_domain.h>
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#include <linux/spinlock.h>
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/*
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@ -236,3 +242,84 @@ static void __init cpg_mstp_clocks_init(struct device_node *np)
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of_clk_add_provider(np, of_clk_src_onecell_get, &group->data);
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}
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CLK_OF_DECLARE(cpg_mstp_clks, "renesas,cpg-mstp-clocks", cpg_mstp_clocks_init);
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#ifdef CONFIG_PM_GENERIC_DOMAINS_OF
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int cpg_mstp_attach_dev(struct generic_pm_domain *domain, struct device *dev)
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{
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struct device_node *np = dev->of_node;
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struct of_phandle_args clkspec;
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struct clk *clk;
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int i = 0;
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int error;
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while (!of_parse_phandle_with_args(np, "clocks", "#clock-cells", i,
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&clkspec)) {
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if (of_device_is_compatible(clkspec.np,
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"renesas,cpg-mstp-clocks"))
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goto found;
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of_node_put(clkspec.np);
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i++;
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}
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return 0;
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found:
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clk = of_clk_get_from_provider(&clkspec);
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of_node_put(clkspec.np);
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if (IS_ERR(clk))
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return PTR_ERR(clk);
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error = pm_clk_create(dev);
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if (error) {
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dev_err(dev, "pm_clk_create failed %d\n", error);
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goto fail_put;
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}
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error = pm_clk_add_clk(dev, clk);
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if (error) {
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dev_err(dev, "pm_clk_add_clk %pC failed %d\n", clk, error);
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goto fail_destroy;
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}
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return 0;
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fail_destroy:
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pm_clk_destroy(dev);
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fail_put:
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clk_put(clk);
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return error;
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}
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void cpg_mstp_detach_dev(struct generic_pm_domain *domain, struct device *dev)
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{
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if (!list_empty(&dev->power.subsys_data->clock_list))
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pm_clk_destroy(dev);
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}
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void __init cpg_mstp_add_clk_domain(struct device_node *np)
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{
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struct generic_pm_domain *pd;
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u32 ncells;
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if (of_property_read_u32(np, "#power-domain-cells", &ncells)) {
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pr_warn("%s lacks #power-domain-cells\n", np->full_name);
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return;
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}
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pd = kzalloc(sizeof(*pd), GFP_KERNEL);
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if (!pd)
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return;
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pd->name = np->name;
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pd->flags = GENPD_FLAG_PM_CLK;
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pm_genpd_init(pd, &simple_qos_governor, false);
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pd->attach_dev = cpg_mstp_attach_dev;
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pd->detach_dev = cpg_mstp_detach_dev;
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of_genpd_add_provider_simple(np, pd);
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}
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#endif /* !CONFIG_PM_GENERIC_DOMAINS_OF */
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@ -16,8 +16,20 @@
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#include <linux/types.h>
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struct device;
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struct device_node;
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struct generic_pm_domain;
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void r8a7778_clocks_init(u32 mode);
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void r8a7779_clocks_init(u32 mode);
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void rcar_gen2_clocks_init(u32 mode);
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#ifdef CONFIG_PM_GENERIC_DOMAINS_OF
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void cpg_mstp_add_clk_domain(struct device_node *np);
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int cpg_mstp_attach_dev(struct generic_pm_domain *domain, struct device *dev);
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void cpg_mstp_detach_dev(struct generic_pm_domain *domain, struct device *dev);
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#else
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static inline void cpg_mstp_add_clk_domain(struct device_node *np) {}
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#endif
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#endif
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