[PATCH v3 2/3] OMAP3: Add support for TPS65023 (AM35x only)

Abhilash K V
2011-09-22T13:29:14Z

From: Sanjeev Premi <premi@ti.com>

This patch adds support for TPS65023 used with
OMAP3 devices. The PMIC is currently hooked to
AM35x devices, but can easily be extended for
other OMAP3 devices.

Signed-off-by: Sanjeev Premi <premi@ti.com>
Signed-off-by: Abhilash K V <abhilash.kv@ti.com>
---
arch/arm/mach-omap2/Makefile | 3 +-
arch/arm/mach-omap2/pm.c | 1 +
arch/arm/mach-omap2/pm.h | 9 ++++
arch/arm/mach-omap2/pmic_tps65023.c | 84 +++++++++++++++++++++++++++++++++++
4 files changed, 96 insertions(+), 1 deletions(-)
create mode 100644 arch/arm/mach-omap2/pmic_tps65023.c

diff --git a/arch/arm/mach-omap2/Makefile b/arch/arm/mach-omap2/Makefile
index 46a3497..e71e4bc 100644
--- a/arch/arm/mach-omap2/Makefile
+++ b/arch/arm/mach-omap2/Makefile
@@ -18,7 +18,8 @@ obj-$(CONFIG_ARCH_OMAP4) += prm44xx.o $(hwmod-common)

obj-$(CONFIG_OMAP_MCBSP) += mcbsp.o

-obj-$(CONFIG_TWL4030_CORE) += omap_twl.o
+obj-$(CONFIG_TWL4030_CORE) += omap_twl.o
+obj-$(CONFIG_REGULATOR_TPS65023) += pmic_tps65023.o

# SMP support ONLY available for OMAP4
obj-$(CONFIG_SMP) += omap-smp.o omap-headsmp.o
diff --git a/arch/arm/mach-omap2/pm.c b/arch/arm/mach-omap2/pm.c
index da71abc..bb64383 100644
--- a/arch/arm/mach-omap2/pm.c
+++ b/arch/arm/mach-omap2/pm.c
@@ -255,6 +255,7 @@ static int __init omap2_common_pm_late_init(void)
if (omap3_has_sr())
omap3_twl_init();
omap4_twl_init();
+ omap3_tps65023_init();

/* Init the voltage layer */
omap_voltage_late_init();
diff --git a/arch/arm/mach-omap2/pm.h b/arch/arm/mach-omap2/pm.h
index 4e166ad..ce028f6 100644
--- a/arch/arm/mach-omap2/pm.h
+++ b/arch/arm/mach-omap2/pm.h
@@ -133,5 +133,14 @@ static inline int omap4_twl_init(void)
return -EINVAL;
}
#endif
+#ifdef CONFIG_REGULATOR_TPS65023
+extern int omap3_tps65023_init(void);
+#else
+static inline int omap3_tps65023_init(void)
+{
+ return -EINVAL;
+}
+#endif
+

#endif
diff --git a/arch/arm/mach-omap2/pmic_tps65023.c b/arch/arm/mach-omap2/pmic_tps65023.c
new file mode 100644
index 0000000..415d804
--- /dev/null
+++ b/arch/arm/mach-omap2/pmic_tps65023.c
@@ -0,0 +1,84 @@
+/**
+ * Implements support for TPS65023
+ *
+ * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/
+ *
+ * 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 version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/i2c/twl.h>
+
+#include "voltage.h"
+
+#include "pm.h"
+
+#define TPS65023_VDCDC1_MIN 800000 /* 0.8V */
+#define TPS65023_VDCDC1_STEP 25000 /* 0.025V */
+
+
+/*
+ * Get voltage corresponding to specified vsel value using this formula:
+ * Vout = 0.8V + (25mV x Vsel)
+ */
+static unsigned long tps65023_vsel_to_uv(const u8 vsel)
+{
+ return TPS65023_VDCDC1_MIN + (TPS65023_VDCDC1_STEP * vsel);
+}
+
+/*
+ * Get vsel value corresponding to specified voltage using this formula:
+ * Vsel = (Vout - 0.8V)/ 25mV
+ */
+static u8 tps65023_uv_to_vsel(unsigned long uv)
+{
+ return DIV_ROUND_UP(uv - TPS65023_VDCDC1_MIN, TPS65023_VDCDC1_STEP);
+}
+
+/*
+ * TPS65023 is currently supported only for AM35x devices.
+ * Therefore, implementation below is specific to this device pair.
+ */
+
+/**
+ * Voltage information related to the MPU voltage domain of the
+ * AM35x processors - in relation to the TPS65023.
+ */
+static struct omap_voltdm_pmic tps65023_am35xx_mpu_volt_info = {
+ .step_size = 25000,
+ .on_volt = 1200000,
+ .vsel_to_uv = tps65023_vsel_to_uv,
+ .uv_to_vsel = tps65023_uv_to_vsel,
+};
+
+int __init omap3_tps65023_init(void)
+{
+ struct voltagedomain *voltdm;
+
+ if (!cpu_is_omap34xx())
+ return -ENODEV;
+
+ if (cpu_is_omap3505() || cpu_is_omap3517()) {
+ voltdm = voltdm_lookup("mpu");
+ omap_voltage_register_pmic(voltdm,
+ &tps65023_am35xx_mpu_volt_info);
+ voltdm = voltdm_lookup("core");
+ omap_voltage_register_pmic(voltdm,
+ &tps65023_am35xx_mpu_volt_info);
+ } else {
+ /* TODO:
+ * Support for other devices that support TPS65023
+ */
+ }
+
+ return 0;
+}
--
1.7.1