This patch adds support for registering power domains of S3C64xx SoCs
and binding devices to them using device tree.
Signed-off-by: Tomasz Figa <tomasz.figa@xxxxxxxxx>
---
arch/arm/mach-s3c64xx/pm.c | 71 +++++++++++++++++++++----
include/dt-bindings/arm/s3c64xx-power-domains.h | 26 +++++++++
2 files changed, 88 insertions(+), 9 deletions(-)
create mode 100644 include/dt-bindings/arm/s3c64xx-power-domains.h
diff --git a/arch/arm/mach-s3c64xx/pm.c b/arch/arm/mach-s3c64xx/pm.c
index 717d9be..673baaf 100644
--- a/arch/arm/mach-s3c64xx/pm.c
+++ b/arch/arm/mach-s3c64xx/pm.c
@@ -17,8 +17,11 @@
#include <linux/serial_core.h>
#include <linux/io.h>
#include <linux/gpio.h>
+#include <linux/of.h>
#include <linux/pm_domain.h>
+#include <dt-bindings/arm/s3c64xx-power-domains.h>
+
#include <mach/map.h>
#include <mach/irqs.h>
@@ -164,17 +167,63 @@ static struct s3c64xx_pm_domain s3c64xx_pm_v = {
},
};
-static struct s3c64xx_pm_domain *s3c64xx_pm_domains[] = {
- &s3c64xx_pm_irom,
- &s3c64xx_pm_etm,
- &s3c64xx_pm_g,
- &s3c64xx_pm_v,
- &s3c64xx_pm_i,
- &s3c64xx_pm_p,
- &s3c64xx_pm_s,
- &s3c64xx_pm_f,
+static struct s3c64xx_pm_domain *s3c64xx_pm_domains[NR_DOMAINS] = {
+ [DOMAIN_V] = &s3c64xx_pm_v,
+ [DOMAIN_G] = &s3c64xx_pm_g,
+ [DOMAIN_I] = &s3c64xx_pm_i,
+ [DOMAIN_P] = &s3c64xx_pm_p,
+ [DOMAIN_F] = &s3c64xx_pm_f,
+ [DOMAIN_S] = &s3c64xx_pm_s,
+ [DOMAIN_ETM] = &s3c64xx_pm_etm,
+ [DOMAIN_IROM] = &s3c64xx_pm_irom,
+};
+
+#ifdef CONFIG_OF
+static struct of_device_id s3c64xx_pd_matches[] = {
+ { .compatible = "samsung,s3c6400-clock", },
+ { .compatible = "samsung,s3c6410-clock", },
+ { },
};
+static struct genpd_onecell_data pd_data;
+
+static int s3c64xx_pm_parse_domains(void)
+{
+ struct device_node *np;
+ int i;
+
+ np = of_find_matching_node(NULL, s3c64xx_pd_matches);
+ if (!np)
+ return -ENODEV;
+
+ pd_data.domains = kcalloc(ARRAY_SIZE(s3c64xx_pm_domains),
+ sizeof(*pd_data.domains), GFP_KERNEL);
+ if (!pd_data.domains)
+ return -ENOMEM;
+
+ for (i = 0; i < ARRAY_SIZE(s3c64xx_pm_domains); ++i) {
+ struct s3c64xx_pm_domain *pd = s3c64xx_pm_domains[i];
+ struct dev_power_governor *gov = NULL;
+ int on;
+
+ on = __raw_readl(S3C64XX_NORMAL_CFG) & pd->ena;
+
+ if (pd->always_on)
+ gov = &pm_domain_always_on_gov;
+
+ pm_genpd_init(&pd->pd, gov, !on);
+ pd_data.domains[i] = &pd->pd;
+
+ pr_debug("%s: registered domain %s\n", __func__, pd->pd.name);
+ }
+
+ pd_data.domain_num = ARRAY_SIZE(s3c64xx_pm_domains);
+ of_genpd_add_provider(np, of_genpd_xlate_onecell, &pd_data);
+
+ return 0;
+}
+#endif
+
#ifdef CONFIG_S3C_PM_DEBUG_LED_SMDK
void s3c_pm_debug_smdkled(u32 set, u32 clear)
{
@@ -311,6 +360,10 @@ int __init s3c64xx_pm_init(void)
s3c_pm_init();
+#ifdef CONFIG_OF
+ if (of_have_populated_dt())
+ return s3c64xx_pm_parse_domains();
+#endif
for (i = 0; i < ARRAY_SIZE(s3c64xx_pm_domains); i++) {
struct s3c64xx_pm_domain *pd = s3c64xx_pm_domains[i];
diff --git a/include/dt-bindings/arm/s3c64xx-power-domains.h b/include/dt-bindings/arm/s3c64xx-power-domains.h
new file mode 100644
index 0000000..ce39bef
--- /dev/null
+++ b/include/dt-bindings/arm/s3c64xx-power-domains.h
@@ -0,0 +1,26 @@
+/*
+ * Copyright (c) 2014 Tomasz Figa <tomasz.figa at gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Device Tree binding constants for Samsung S3C64xx power domains.
+*/
+
+#ifndef _DT_BINDINGS_ARM_S3C64XX_POWER_DOMAINS_H
+#define _DT_BINDINGS_ARM_S3C64XX_POWER_DOMAINS_H
+
+#define DOMAIN_V 0
+#define DOMAIN_G 1
+#define DOMAIN_I 2
+#define DOMAIN_P 3
+#define DOMAIN_F 4
+#define DOMAIN_S 5
+#define DOMAIN_ETM 6
+#define DOMAIN_IROM 7
+
+/* Total number of clocks. */
+#define NR_DOMAINS (DOMAIN_IROM + 1)
+
+#endif /* _DT_BINDINGS_ARM_S3C64XX_POWER_DOMAINS_H */
--
1.8.5.2
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