Subject: Re: [PATCH 4/5] cpuidle: psci: Convert PM domain to platform driver

From: Lina Iyer <[email-masked]>
Date: Tue, 23 Jun 2020 11:21:56 -0600

On Mon, Jun 15 2020 at 09:21 -0600, Ulf Hansson wrote:
>To enable support for deferred probing and to allow implementation of the
>->sync_state() callback from subsequent changes, let's convert into a
>platform driver.
>
>Signed-off-by: Ulf Hansson <[email-masked]>
Reviewed-by: Lina Iyer <[email-masked]>

>---
> drivers/cpuidle/cpuidle-psci-domain.c | 45 +++++++++++++++++----------
> 1 file changed, 28 insertions(+), 17 deletions(-)
>
>diff --git a/drivers/cpuidle/cpuidle-psci-domain.c b/drivers/cpuidle/cpuidle-psci-domain.c
>index e48e578aaa7d..bf527d2bb4b6 100644
>--- a/drivers/cpuidle/cpuidle-psci-domain.c
>+++ b/drivers/cpuidle/cpuidle-psci-domain.c
>@@ -12,6 +12,7 @@
> #include <linux/cpu.h>
> #include <linux/device.h>
> #include <linux/kernel.h>
>+#include <linux/platform_device.h>
> #include <linux/pm_domain.h>
> #include <linux/pm_runtime.h>
> #include <linux/psci.h>
>@@ -42,8 +43,8 @@ static int psci_pd_power_off(struct generic_pm_domain *pd)
> 	return 0;
> }
>
>-static int __init psci_pd_parse_state_nodes(struct genpd_power_state *states,
>-					int state_count)
>+static int psci_pd_parse_state_nodes(struct genpd_power_state *states,
>+				     int state_count)
> {
> 	int i, ret;
> 	u32 psci_state, *psci_state_buf;
>@@ -72,7 +73,7 @@ static int __init psci_pd_parse_state_nodes(struct genpd_power_state *states,
> 	return ret;
> }
>
>-static int __init psci_pd_parse_states(struct device_node *np,
>+static int psci_pd_parse_states(struct device_node *np,
> 			struct genpd_power_state **states, int *state_count)
> {
> 	int ret;
>@@ -100,7 +101,7 @@ static void psci_pd_free_states(struct genpd_power_state *states,
> 	kfree(states);
> }
>
>-static int __init psci_pd_init(struct device_node *np)
>+static int psci_pd_init(struct device_node *np)
> {
> 	struct generic_pm_domain *pd;
> 	struct psci_pd_provider *pd_provider;
>@@ -167,7 +168,7 @@ static int __init psci_pd_init(struct device_node *np)
> 	return ret;
> }
>
>-static void __init psci_pd_remove(void)
>+static void psci_pd_remove(void)
> {
> 	struct psci_pd_provider *pd_provider, *it;
> 	struct generic_pm_domain *genpd;
>@@ -185,7 +186,7 @@ static void __init psci_pd_remove(void)
> 	}
> }
>
>-static int __init psci_pd_init_topology(struct device_node *np, bool add)
>+static int psci_pd_init_topology(struct device_node *np, bool add)
> {
> 	struct device_node *node;
> 	struct of_phandle_args child, parent;
>@@ -211,24 +212,24 @@ static int __init psci_pd_init_topology(struct device_node *np, bool add)
> 	return 0;
> }
>
>-static int __init psci_pd_add_topology(struct device_node *np)
>+static int psci_pd_add_topology(struct device_node *np)
> {
> 	return psci_pd_init_topology(np, true);
> }
>
>-static void __init psci_pd_remove_topology(struct device_node *np)
>+static void psci_pd_remove_topology(struct device_node *np)
> {
> 	psci_pd_init_topology(np, false);
> }
>
>-static const struct of_device_id psci_of_match[] __initconst = {
>+static const struct of_device_id psci_of_match[] = {
> 	{ .compatible = "arm,psci-1.0" },
> 	{}
> };
>
>-static int __init psci_idle_init_domains(void)
>+static int psci_cpuidle_domain_probe(struct platform_device *pdev)
> {
>-	struct device_node *np = of_find_matching_node(NULL, psci_of_match);
>+	struct device_node *np = pdev->dev.of_node;
> 	struct device_node *node;
> 	int ret = 0, pd_count = 0;
>
>@@ -237,7 +238,7 @@ static int __init psci_idle_init_domains(void)
>
> 	/* Currently limit the hierarchical topology to be used in OSI mode. */
> 	if (!psci_has_osi_support())
>-		goto out;
>+		return 0;
>
> 	/*
> 	 * Parse child nodes for the "#power-domain-cells" property and
>@@ -256,7 +257,7 @@ static int __init psci_idle_init_domains(void)
>
> 	/* Bail out if not using the hierarchical CPU topology. */
> 	if (!pd_count)
>-		goto out;
>+		return 0;
>
> 	/* Link genpd masters/subdomains to model the CPU topology. */
> 	ret = psci_pd_add_topology(np);
>@@ -271,9 +272,8 @@ static int __init psci_idle_init_domains(void)
> 		goto remove_pd;
> 	}
>
>-	of_node_put(np);
> 	pr_info("Initialized CPU PM domain topology\n");
>-	return pd_count;
>+	return 0;
>
> put_node:
> 	of_node_put(node);
>@@ -281,10 +281,21 @@ static int __init psci_idle_init_domains(void)
> 	if (pd_count)
> 		psci_pd_remove();
> 	pr_err("failed to create CPU PM domains ret=%d\n", ret);
>-out:
>-	of_node_put(np);
> 	return ret;
> }
>+
>+static struct platform_driver psci_cpuidle_domain_driver = {
>+	.probe  = psci_cpuidle_domain_probe,
>+	.driver = {
>+		.name = "psci-cpuidle-domain",
>+		.of_match_table = psci_of_match,
>+	},
>+};
>+
>+static int __init psci_idle_init_domains(void)
>+{
>+	return platform_driver_register(&psci_cpuidle_domain_driver);
>+}
> subsys_initcall(psci_idle_init_domains);
>
> struct device *psci_dt_attach_cpu(int cpu)
>-- 
>2.20.1
>

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