[U-Boot] [PATCH 2/5] pmic: pmic_mc34vr500: Add APIs to set/get SWx volt

[Zhiqiang Hou]

From: Hou Zhiqiang <Zhiqiang.Hou at nxp.com>

Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou at nxp.com>
---
 board/freescale/common/Makefile    |  1 +
 board/freescale/common/mc34vr500.c | 95 ++++++++++++++++++++++++++++++++++++++
 include/power/mc34vr500_pmic.h     |  9 ++++
 3 files changed, 105 insertions(+)
 create mode 100644 board/freescale/common/mc34vr500.c

diff --git a/board/freescale/common/Makefile b/board/freescale/common/Makefile
index be114ce..eea9514 100644
--- a/board/freescale/common/Makefile
+++ b/board/freescale/common/Makefile
@@ -61,6 +61,7 @@ obj-$(CONFIG_VSC_CROSSBAR)    += vsc3316_3308.o
 obj-$(CONFIG_IDT8T49N222A)	+= idt8t49n222a_serdes_clk.o
 obj-$(CONFIG_ZM7300)		+= zm7300.o
 obj-$(CONFIG_POWER_PFUZE100)	+= pfuze.o
+obj-$(CONFIG_POWER_MC34VR500)	+= mc34vr500.o
 
 obj-$(CONFIG_LS102XA_STREAM_ID)	+= ls102xa_stream_id.o
 
diff --git a/board/freescale/common/mc34vr500.c b/board/freescale/common/mc34vr500.c
new file mode 100644
index 0000000..9c57569
--- /dev/null
+++ b/board/freescale/common/mc34vr500.c
@@ -0,0 +1,95 @@
+/*
+ * Copyright 2016 Freescale Semiconductor, Inc.
+ * Hou Zhiqiang <Zhiqiang.Hou at freescale.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <errno.h>
+#include <i2c.h>
+#include <power/pmic.h>
+#include <power/mc34vr500_pmic.h>
+
+static uint8_t swxvolt_addr[4] = { MC34VR500_SW1VOLT,
+				   MC34VR500_SW2VOLT,
+				   MC34VR500_SW3VOLT,
+				   MC34VR500_SW4VOLT };
+
+static uint8_t swx_set_point_base[4] = { 13, 9, 9, 9 };
+
+int mc34vr500_get_sw_volt(uint8_t sw)
+{
+	struct pmic *p;
+	u32 swxvolt;
+	uint8_t spb;
+	int sw_volt;
+	int ret;
+
+	debug("%s: Get SW%u volt from swxvolt_addr = 0x%x\n",
+	      __func__, sw + 1, swxvolt_addr[sw]);
+	if (sw > SW4) {
+		printf("%s: Unsupported SW(sw%d)\n", __func__, sw + 1);
+		return -EINVAL;
+	}
+
+	p = pmic_get("MC34VR500");
+	if (!p) {
+		printf("%s: Did NOT find PMIC MC34VR500\n", __func__);
+		return -ENODEV;
+	}
+
+	ret = pmic_probe(p);
+	if (ret)
+		return ret;
+
+	ret = pmic_reg_read(p, swxvolt_addr[sw], &swxvolt);
+	if (ret) {
+		printf("%s: Failed to get SW%u volt\n", __func__, sw + 1);
+		return ret;
+	}
+
+	debug("%s: SW%d step point swxvolt = %u\n", __func__, sw + 1, swxvolt);
+	spb = swx_set_point_base[sw];
+	/* The base of SW volt is 625mV and increase by step 25mV */
+	sw_volt = 625 + (swxvolt - spb) * 25;
+
+	debug("%s: SW%u volt = %dmV\n", __func__, sw + 1, sw_volt);
+	return sw_volt;
+}
+
+int mc34vr500_set_sw_volt(uint8_t sw, int sw_volt)
+{
+	struct pmic *p;
+	u32 swxvolt;
+	uint8_t spb;
+	int ret;
+
+	debug("%s: Set SW%u volt to %dmV\n", __func__, sw + 1, sw_volt);
+	/* The least SW volt is 625mV, and only 4 SW outputs */
+	if (sw > SW4 || sw_volt < 625)
+		return -EINVAL;
+
+	p = pmic_get("MC34VR500");
+	if (!p) {
+		printf("%s: Did NOT find PMIC MC34VR500\n", __func__);
+		return -ENODEV;
+	}
+
+	ret = pmic_probe(p);
+	if (ret)
+		return ret;
+
+	spb = swx_set_point_base[sw];
+	/* The base of SW volt is 625mV and increase by step 25mV */
+	swxvolt = (sw_volt - 625) / 25 + spb;
+	debug("%s: SW%d step point swxvolt = %u\n", __func__, sw + 1, swxvolt);
+	if (swxvolt > 63)
+		return -EINVAL;
+
+	ret = pmic_reg_write(p, swxvolt_addr[sw], swxvolt);
+	if (ret)
+		return ret;
+
+	return 0;
+}
diff --git a/include/power/mc34vr500_pmic.h b/include/power/mc34vr500_pmic.h
index df4985a..b0b143a 100644
--- a/include/power/mc34vr500_pmic.h
+++ b/include/power/mc34vr500_pmic.h
@@ -162,5 +162,14 @@ enum {
 #define APS_PFM		0xc
 #define PWM_PFM		0xd
 
+enum swx {
+	SW1 = 0,
+	SW2,
+	SW3,
+	SW4,
+};
+
+int mc34vr500_get_sw_volt(uint8_t sw);
+int mc34vr500_set_sw_volt(uint8_t sw, int sw_volt);
 int power_mc34vr500_init(unsigned char bus);
 #endif /* __MC34VR500_PMIC_H_ */
-- 
2.1.0.27.g96db324