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Message-ID: <20170314145621.2k3i3vz6j2eznyfu@dell>
Date: Tue, 14 Mar 2017 14:56:21 +0000
From: Lee Jones <lee.jones@...aro.org>
To: Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
Cc: robh+dt@...nel.org, mark.rutland@....com, linus.walleij@...aro.org,
gnurou@...il.com, devicetree@...r.kernel.org,
linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
patches@...nsource.wolfsonmicro.com
Subject: Re: [PATCH v3 1/3] mfd: wm831x: Add basic device tree binding
On Mon, 06 Mar 2017, Charles Keepax wrote:
> Add the basic ability to register the device through device tree, more
> work is needed to get each individual sub-driver functioning correctly
> but this is enough to get the device to probe from device tree.
>
> Signed-off-by: Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
> ---
>
> No changes since v2.
>
> drivers/mfd/wm831x-core.c | 32 +++++++++++++++++++++++++++++++-
> drivers/mfd/wm831x-i2c.c | 9 ++++++++-
> drivers/mfd/wm831x-irq.c | 6 +++---
> drivers/mfd/wm831x-spi.c | 6 +++++-
> include/linux/mfd/wm831x/core.h | 15 +++++++++++++++
> 5 files changed, 62 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/mfd/wm831x-core.c b/drivers/mfd/wm831x-core.c
> index 3e0e99e..21d3cdd 100644
> --- a/drivers/mfd/wm831x-core.c
> +++ b/drivers/mfd/wm831x-core.c
> @@ -19,6 +19,8 @@
> #include <linux/mfd/core.h>
> #include <linux/slab.h>
> #include <linux/err.h>
> +#include <linux/of.h>
> +#include <linux/of_device.h>
>
> #include <linux/mfd/wm831x/core.h>
> #include <linux/mfd/wm831x/pdata.h>
> @@ -1613,6 +1615,31 @@ struct regmap_config wm831x_regmap_config = {
> };
> EXPORT_SYMBOL_GPL(wm831x_regmap_config);
>
> +#ifdef CONFIG_OF
> +const struct of_device_id wm831x_of_match[] = {
> + { .compatible = "wlf,wm8310", .data = (void *)WM8310 },
> + { .compatible = "wlf,wm8311", .data = (void *)WM8311 },
> + { .compatible = "wlf,wm8312", .data = (void *)WM8312 },
> + { .compatible = "wlf,wm8320", .data = (void *)WM8320 },
> + { .compatible = "wlf,wm8321", .data = (void *)WM8321 },
> + { .compatible = "wlf,wm8325", .data = (void *)WM8325 },
> + { .compatible = "wlf,wm8326", .data = (void *)WM8326 },
> + { },
> +};
> +EXPORT_SYMBOL_GPL(wm831x_of_match);
> +
> +int wm831x_of_get_type(struct device *dev)
> +{
> + const struct of_device_id *id = of_match_device(wm831x_of_match, dev);
> +
> + if (id)
> + return (unsigned long)id->data;
> + else
This is not possible.
> + return 0;
> +}
> +EXPORT_SYMBOL_GPL(wm831x_of_get_type);
No need for this function and certainly no requirement to export it.
> +#endif
> +
> /*
> * Instantiate the generic non-control parts of the device.
> */
> @@ -1628,7 +1655,10 @@ int wm831x_device_init(struct wm831x *wm831x, unsigned long id, int irq)
You can expand 'id' to 'type' now.
> dev_set_drvdata(wm831x->dev, wm831x);
>
> if (pdata)
> - wm831x->soft_shutdown = pdata->soft_shutdown;
> + memcpy(&wm831x->pdata, pdata, sizeof(*pdata));
> + pdata = &wm831x->pdata;
We normally deal with pdata in .probe().
It makes sense to group it with your 'get_type' code.
> + wm831x->soft_shutdown = pdata->soft_shutdown;
>
> ret = wm831x_reg_read(wm831x, WM831X_PARENT_ID);
> if (ret < 0) {
> diff --git a/drivers/mfd/wm831x-i2c.c b/drivers/mfd/wm831x-i2c.c
> index 824bcba..b2acd92 100644
> --- a/drivers/mfd/wm831x-i2c.c
> +++ b/drivers/mfd/wm831x-i2c.c
> @@ -28,8 +28,14 @@ static int wm831x_i2c_probe(struct i2c_client *i2c,
> const struct i2c_device_id *id)
> {
> struct wm831x *wm831x;
> + enum wm831x_parent type;
> int ret;
>
> + if (i2c->dev.of_node)
> + type = (enum wm831x_parent)wm831x_of_get_type(&i2c->dev);
Move the 'get_type' code here instead and store the type into device
data i.e. wm831x.
> + else
> + type = (enum wm831x_parent)id->driver_data;
> +
> wm831x = devm_kzalloc(&i2c->dev, sizeof(struct wm831x), GFP_KERNEL);
> if (wm831x == NULL)
> return -ENOMEM;
> @@ -45,7 +51,7 @@ static int wm831x_i2c_probe(struct i2c_client *i2c,
> return ret;
> }
>
> - return wm831x_device_init(wm831x, id->driver_data, i2c->irq);
> + return wm831x_device_init(wm831x, type, i2c->irq);
> }
>
> static int wm831x_i2c_remove(struct i2c_client *i2c)
> @@ -94,6 +100,7 @@ static struct i2c_driver wm831x_i2c_driver = {
> .driver = {
> .name = "wm831x",
> .pm = &wm831x_pm_ops,
> + .of_match_table = of_match_ptr(wm831x_of_match),
> },
> .probe = wm831x_i2c_probe,
> .remove = wm831x_i2c_remove,
> diff --git a/drivers/mfd/wm831x-irq.c b/drivers/mfd/wm831x-irq.c
> index dfea8b9..c01239a 100644
> --- a/drivers/mfd/wm831x-irq.c
> +++ b/drivers/mfd/wm831x-irq.c
> @@ -564,7 +564,7 @@ static const struct irq_domain_ops wm831x_irq_domain_ops = {
>
> int wm831x_irq_init(struct wm831x *wm831x, int irq)
> {
> - struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev);
> + struct wm831x_pdata *pdata = &wm831x->pdata;
> struct irq_domain *domain;
> int i, ret, irq_base;
>
> @@ -579,7 +579,7 @@ int wm831x_irq_init(struct wm831x *wm831x, int irq)
> }
>
> /* Try to dynamically allocate IRQs if no base is specified */
> - if (pdata && pdata->irq_base) {
> + if (pdata->irq_base) {
> irq_base = irq_alloc_descs(pdata->irq_base, 0,
> WM831X_NUM_IRQS, 0);
> if (irq_base < 0) {
> @@ -608,7 +608,7 @@ int wm831x_irq_init(struct wm831x *wm831x, int irq)
> return -EINVAL;
> }
>
> - if (pdata && pdata->irq_cmos)
> + if (pdata->irq_cmos)
> i = 0;
> else
> i = WM831X_IRQ_OD;
> diff --git a/drivers/mfd/wm831x-spi.c b/drivers/mfd/wm831x-spi.c
> index 80482ae..44c6eec 100644
> --- a/drivers/mfd/wm831x-spi.c
> +++ b/drivers/mfd/wm831x-spi.c
> @@ -28,7 +28,10 @@ static int wm831x_spi_probe(struct spi_device *spi)
> enum wm831x_parent type;
> int ret;
>
> - type = (enum wm831x_parent)id->driver_data;
> + if (spi->dev.of_node)
> + type = (enum wm831x_parent)wm831x_of_get_type(&spi->dev);
> + else
> + type = (enum wm831x_parent)id->driver_data;
>
> wm831x = devm_kzalloc(&spi->dev, sizeof(struct wm831x), GFP_KERNEL);
> if (wm831x == NULL)
> @@ -97,6 +100,7 @@ static struct spi_driver wm831x_spi_driver = {
> .driver = {
> .name = "wm831x",
> .pm = &wm831x_spi_pm,
> + .of_match_table = of_match_ptr(wm831x_of_match),
> },
> .id_table = wm831x_spi_ids,
> .probe = wm831x_spi_probe,
> diff --git a/include/linux/mfd/wm831x/core.h b/include/linux/mfd/wm831x/core.h
> index 76c2264..752a722 100644
> --- a/include/linux/mfd/wm831x/core.h
> +++ b/include/linux/mfd/wm831x/core.h
> @@ -21,6 +21,8 @@
> #include <linux/list.h>
> #include <linux/regmap.h>
> #include <linux/mfd/wm831x/auxadc.h>
> +#include <linux/mfd/wm831x/pdata.h>
> +#include <linux/of.h>
>
> /*
> * Register values.
> @@ -367,6 +369,8 @@ struct wm831x {
>
> struct regmap *regmap;
>
> + struct wm831x_pdata pdata;
> +
> int irq; /* Our chip IRQ */
> struct mutex irq_lock;
> struct irq_domain *irq_domain;
> @@ -427,4 +431,15 @@ static inline int wm831x_irq(struct wm831x *wm831x, int irq)
>
> extern struct regmap_config wm831x_regmap_config;
>
> +extern const struct of_device_id wm831x_of_match[];
> +
> +#ifdef CONFIG_OF
> +int wm831x_of_get_type(struct device *dev);
> +#else
> +static inline int wm831x_of_get_type(struct device *dev)
> +{
> + return 0;
> +}
> +#endif
No need.
> #endif
--
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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