[U-Boot] [PATCH V4 5/6] exynos: Add a common DT based PMIC driver initialization
Leela Krishna Amudala
l.krishna at samsung.com
Mon Jan 6 12:49:16 CET 2014
Most of i2c PMIC drivers follow the same initialization sequence,
let's generalize it in a common file.
The initialization function finds the PMIC in the device tree, and if
found - registers it in the list of known PMICs and initializes it,
iterating through the table of settings supplied by the caller.
Signed-off-by: Vadim Bendebury <vbendeb at chromium.org>
Signed-off-by: Leela Krishna Amudala <l.krishna at samsung.com>
Reviewed-by: Doug Anderson <dianders at google.com>
Acked-by: Simon Glass <sjg at chromium.org>
---
board/samsung/common/board.c | 22 +++++++++
drivers/power/pmic/Makefile | 1 +
drivers/power/pmic/pmic_common.c | 97 ++++++++++++++++++++++++++++++++++++++
drivers/power/power_core.c | 14 ++++++
include/power/pmic.h | 34 +++++++++++++
5 files changed, 168 insertions(+)
create mode 100644 drivers/power/pmic/pmic_common.c
diff --git a/board/samsung/common/board.c b/board/samsung/common/board.c
index b3b84c1..d23a7a6 100644
--- a/board/samsung/common/board.c
+++ b/board/samsung/common/board.c
@@ -23,6 +23,7 @@
#include <power/pmic.h>
#include <asm/arch/sromc.h>
#include <power/max77686_pmic.h>
+#include <power/s2mps11_pmic.h>
DECLARE_GLOBAL_DATA_PTR;
@@ -160,6 +161,25 @@ static int board_init_cros_ec_devices(const void *blob)
}
#endif
+#ifdef CONFIG_POWER_S2MPS11
+int board_init_s2mps11(void)
+{
+ const struct pmic_init_ops pmic_ops[] = {
+ {PMIC_REG_WRITE, S2MPS11_BUCK1_CTRL2, S2MPS11_BUCK_CTRL2_1V},
+ {PMIC_REG_WRITE, S2MPS11_BUCK2_CTRL2,
+ S2MPS11_BUCK_CTRL2_1_2625V},
+ {PMIC_REG_WRITE, S2MPS11_BUCK3_CTRL2, S2MPS11_BUCK_CTRL2_1V},
+ {PMIC_REG_WRITE, S2MPS11_BUCK4_CTRL2, S2MPS11_BUCK_CTRL2_1V},
+ {PMIC_REG_WRITE, S2MPS11_BUCK6_CTRL2, S2MPS11_BUCK_CTRL2_1V},
+ {PMIC_REG_UPDATE, S2MPS11_REG_RTC_CTRL,
+ S2MPS11_RTC_CTRL_32KHZ_CP_EN | S2MPS11_RTC_CTRL_JIT},
+ {PMIC_REG_BAIL}
+ };
+
+ return pmic_common_init(COMPAT_SAMSUNG_S2MPS11_PMIC, pmic_ops);
+}
+#endif
+
#if defined(CONFIG_POWER)
#ifdef CONFIG_POWER_MAX77686
static int max77686_init(void)
@@ -263,6 +283,8 @@ int power_init_board(void)
#ifdef CONFIG_POWER_MAX77686
ret = max77686_init();
+#elif defined(CONFIG_POWER_S2MPS11)
+ ret = board_init_s2mps11();
#endif
return ret;
diff --git a/drivers/power/pmic/Makefile b/drivers/power/pmic/Makefile
index 0b45ffa..5e236a3 100644
--- a/drivers/power/pmic/Makefile
+++ b/drivers/power/pmic/Makefile
@@ -11,3 +11,4 @@ obj-$(CONFIG_POWER_MUIC_MAX8997) += muic_max8997.o
obj-$(CONFIG_POWER_MAX77686) += pmic_max77686.o
obj-$(CONFIG_POWER_TPS65217) += pmic_tps65217.o
obj-$(CONFIG_POWER_TPS65910) += pmic_tps65910.o
+obj-$(CONFIG_POWER) += pmic_common.o
diff --git a/drivers/power/pmic/pmic_common.c b/drivers/power/pmic/pmic_common.c
new file mode 100644
index 0000000..3117ae2
--- /dev/null
+++ b/drivers/power/pmic/pmic_common.c
@@ -0,0 +1,97 @@
+/*
+ * Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+#include <common.h>
+#include <fdtdec.h>
+#include <errno.h>
+#include <power/pmic.h>
+#include <power/s2mps11_pmic.h>
+#include <power/max77686_pmic.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+static unsigned pmic_number_of_regs(enum fdt_compat_id pmic_compat)
+{
+ switch (pmic_compat) {
+ case COMPAT_SAMSUNG_S2MPS11_PMIC:
+ return S2MPS11_NUM_OF_REGS;
+ default:
+ break;
+ }
+ return 0;
+}
+
+int pmic_common_init(enum fdt_compat_id pmic_compat,
+ const struct pmic_init_ops *pmic_ops)
+{
+ const void *blob = gd->fdt_blob;
+ struct pmic *p;
+ int node, parent, ret;
+ unsigned number_of_regs = pmic_number_of_regs(pmic_compat);
+ const char *pmic_name, *comma;
+
+ if (!number_of_regs) {
+ printf("%s: %s - not a supported PMIC\n",
+ __func__, fdtdec_get_compatible(pmic_compat));
+ return -1;
+ }
+
+ node = fdtdec_next_compatible(blob, 0, pmic_compat);
+ if (node < 0) {
+ debug("PMIC: Error %s. No node for %s in device tree\n",
+ fdt_strerror(node), fdtdec_get_compatible(pmic_compat));
+ return node;
+ }
+
+ pmic_name = fdtdec_get_compatible(pmic_compat);
+ comma = strchr(pmic_name, ',');
+ if (comma)
+ pmic_name = comma + 1;
+
+ p = pmic_alloc();
+
+ if (!p) {
+ printf("%s: POWER allocation error!\n", __func__);
+ return -ENOMEM;
+ }
+ parent = fdt_parent_offset(blob, node);
+ if (parent < 0) {
+ debug("%s: Cannot find node parent\n", __func__);
+ return -1;
+ }
+
+ p->bus = i2c_get_bus_num_fdt(parent);
+ if (p->bus < 0) {
+ debug("%s: Cannot find I2C bus\n", __func__);
+ return -1;
+ }
+ p->hw.i2c.addr = fdtdec_get_int(blob, node, "reg", 9);
+
+ p->name = pmic_name;
+ p->interface = PMIC_I2C;
+ p->hw.i2c.tx_num = 1;
+ p->number_of_regs = number_of_regs;
+ p->compat_id = pmic_compat;
+
+ ret = 0;
+ while ((pmic_ops->reg_op != PMIC_REG_BAIL) && !ret) {
+ if (pmic_ops->reg_op == PMIC_REG_WRITE)
+ ret = pmic_reg_write(p,
+ pmic_ops->reg_addr,
+ pmic_ops->reg_value);
+ else
+ ret = pmic_reg_update(p,
+ pmic_ops->reg_addr,
+ pmic_ops->reg_value);
+ pmic_ops++;
+ }
+
+ if (ret)
+ printf("%s: Failed accessing reg 0x%x of %s\n",
+ __func__, pmic_ops[-1].reg_addr, p->name);
+ else
+ printf("PMIC %s initialized\n", p->name);
+ return ret;
+}
diff --git a/drivers/power/power_core.c b/drivers/power/power_core.c
index a1c4fd0..f40be31 100644
--- a/drivers/power/power_core.c
+++ b/drivers/power/power_core.c
@@ -228,6 +228,20 @@ int pmic_reg_update(struct pmic *p, int reg, u32 val)
return 0;
}
+struct pmic *pmic_get_by_id(enum fdt_compat_id pmic_compat)
+{
+ struct pmic *p;
+
+ list_for_each_entry(p, &pmic_list, list) {
+ if (p->compat_id == pmic_compat) {
+ debug("%s: pmic %s -> 0x%p\n", __func__, p->name, p);
+ return p;
+ }
+ }
+
+ return NULL;
+}
+
U_BOOT_CMD(
pmic, CONFIG_SYS_MAXARGS, 1, do_pmic,
"PMIC",
diff --git a/include/power/pmic.h b/include/power/pmic.h
index e0b9139..e0982e3 100644
--- a/include/power/pmic.h
+++ b/include/power/pmic.h
@@ -12,6 +12,7 @@
#include <linux/list.h>
#include <i2c.h>
#include <power/power_chrg.h>
+#include <fdtdec.h>
enum { PMIC_I2C, PMIC_SPI, PMIC_NONE};
enum { I2C_PMIC, I2C_NUM, };
@@ -72,6 +73,7 @@ struct pmic {
struct pmic *parent;
struct list_head list;
+ enum fdt_compat_id compat_id;
};
int pmic_init(unsigned char bus);
@@ -84,6 +86,38 @@ int pmic_reg_read(struct pmic *p, u32 reg, u32 *val);
int pmic_reg_write(struct pmic *p, u32 reg, u32 val);
int pmic_set_output(struct pmic *p, u32 reg, int ldo, int on);
int pmic_reg_update(struct pmic *p, int reg, u32 val);
+/*
+ * Find registered PMIC based on its compatibility ID.
+ *
+ * @param pmic_compat compatibility ID of the PMIC to search for.
+ * @return pointer to the relevant 'struct pmic' on success or NULL
+ */
+struct pmic *pmic_get_by_id(enum fdt_compat_id pmic_compat);
+
+enum pmic_reg_op { PMIC_REG_BAIL, PMIC_REG_WRITE, PMIC_REG_UPDATE };
+struct pmic_init_ops {
+ enum pmic_reg_op reg_op;
+ u8 reg_addr;
+ u8 reg_value;
+};
+
+/**
+ * Common function used to intialize an i2c based PMIC.
+ *
+ * This function finds the PMIC in the device tree based on its compatibility
+ * ID. If found, the struct pmic is allocated, initialized and registered.
+ *
+ * Then the table of initialization settings is scanned and the PMIC registers
+ * are set as dictated by the table contents,
+ *
+ * @param pmic_compat compatibility ID f the PMIC to be initialized.
+ * @param pmic_ops a pointer to the table containing PMIC initialization
+ * settings. The last entry contains reg_op
+ * of PMIC_REG_BAIL.
+ * @return zero on success, nonzero on failure
+ */
+int pmic_common_init(enum fdt_compat_id pmic_compat,
+ const struct pmic_init_ops *pmic_ops);
#define pmic_i2c_addr (p->hw.i2c.addr)
#define pmic_i2c_tx_num (p->hw.i2c.tx_num)
--
1.7.9.5
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