[U-Boot] [PATCH V5 5/6] exynos: Add a common DT based PMIC driver initialization

[Minkyu Kang <mk7.kang@samsung.com>]

On 16/01/14 17:55, Leela Krishna Amudala wrote:
> 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@chromium.org>
> Signed-off-by: Leela Krishna Amudala <l.krishna@samsung.com>
> Reviewed-by: Doug Anderson <dianders@google.com>
> Acked-by: Simon Glass <sjg@chromium.org>
> ---
>  board/samsung/common/board.c     |   26 ++++++++++++
>  drivers/power/pmic/Makefile      |    1 +
>  drivers/power/pmic/pmic_common.c |   87 ++++++++++++++++++++++++++++++++++++++
>  drivers/power/power_core.c       |   14 ++++++
>  include/power/pmic.h             |   36 ++++++++++++++++
>  5 files changed, 164 insertions(+)
>  create mode 100644 drivers/power/pmic/pmic_common.c
> 
> diff --git a/drivers/power/pmic/pmic_common.c b/drivers/power/pmic/pmic_common.c
> new file mode 100644
> index 0000000..ea1e90f
> --- /dev/null
> +++ b/drivers/power/pmic/pmic_common.c
> @@ -0,0 +1,87 @@
> +/*
> + * Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
> + *
> + * SPDX-License-Identifier:	GPL-2.0+
> + *
> + * Author: Vadim Bendebury <vbendeb@chromium.org>
> + */
> +#include <common.h>
> +#include <fdtdec.h>
> +#include <errno.h>
> +#include <power/pmic.h>
> +
> +DECLARE_GLOBAL_DATA_PTR;
> +
> +int pmic_common_init(enum fdt_compat_id pmic_compat,
> +		     const struct pmic_init_ops *pmic_ops,
> +		     unsigned int number_of_regs)
> +{
> +	const void *blob = gd->fdt_blob;
> +	struct pmic *p;
> +	int node, parent, ret;
> +	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;

ret = 0; unnecessary.

> +	while (pmic_ops->reg_op != PMIC_REG_BAIL) {
> +		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);
> +		if (ret) {
> +			printf("%s: Failed accessing reg 0x%x of %s\n",
> +			       __func__, pmic_ops->reg_addr, p->name);
> +			return ret;
> +		}
> +		pmic_ops++;
> +	}
> +
> +	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)

Seems to did not use anywhere.

> +{
> +	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",

Thanks,
Minkyu Kang.