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Subject[PATCH v3 01/14] rtc: pcf2127: add variant-specific configuration structure
From: Hugo Villeneuve <hvilleneuve@dimonoff.com>

Create variant-specific configuration structures to simplify the
implementation of new variants into this driver. It will also avoid
to have too many tests for a specific variant, or a list of variants
for new devices, inside the code itself.

Add configuration options for the support of the NVMEM, bit CD0 in
register WD_CTL as well as the maximum number of registers for each
variant, instead of hardcoding the variant (PCF2127) inside the
i2c_device_id and spi_device_id structures.

Also specify a different maximum number of registers (max_register)
for the PCF2129.

Signed-off-by: Hugo Villeneuve <hvilleneuve@dimonoff.com>
---
drivers/rtc/rtc-pcf2127.c | 95 +++++++++++++++++++++++++++++++--------
1 file changed, 76 insertions(+), 19 deletions(-)

diff --git a/drivers/rtc/rtc-pcf2127.c b/drivers/rtc/rtc-pcf2127.c
index 87f4fc9df68b..b9a5d47a439f 100644
--- a/drivers/rtc/rtc-pcf2127.c
+++ b/drivers/rtc/rtc-pcf2127.c
@@ -21,6 +21,7 @@
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_irq.h>
+#include <linux/of_device.h>
#include <linux/regmap.h>
#include <linux/watchdog.h>

@@ -101,10 +102,17 @@
PCF2127_BIT_CTRL2_WDTF | \
PCF2127_BIT_CTRL2_TSF2)

+struct pcf21xx_config {
+ int max_register;
+ unsigned int has_nvmem:1;
+ unsigned int has_bit_wd_ctl_cd0:1;
+};
+
struct pcf2127 {
struct rtc_device *rtc;
struct watchdog_device wdd;
struct regmap *regmap;
+ const struct pcf21xx_config *cfg;
time64_t ts;
bool ts_valid;
bool irq_enabled;
@@ -631,8 +639,27 @@ static const struct attribute_group pcf2127_attr_group = {
.attrs = pcf2127_attrs,
};

+enum pcf21xx_type {
+ PCF2127,
+ PCF2129,
+ PCF21XX_LAST_ID
+};
+
+static struct pcf21xx_config pcf21xx_cfg[] = {
+ [PCF2127] = {
+ .max_register = 0x1d,
+ .has_nvmem = 1,
+ .has_bit_wd_ctl_cd0 = 1,
+ },
+ [PCF2129] = {
+ .max_register = 0x19,
+ .has_nvmem = 0,
+ .has_bit_wd_ctl_cd0 = 0,
+ },
+};
+
static int pcf2127_probe(struct device *dev, struct regmap *regmap,
- int alarm_irq, const char *name, bool is_pcf2127)
+ int alarm_irq, const char *name, const struct pcf21xx_config *config)
{
struct pcf2127 *pcf2127;
int ret = 0;
@@ -645,6 +672,7 @@ static int pcf2127_probe(struct device *dev, struct regmap *regmap,
return -ENOMEM;

pcf2127->regmap = regmap;
+ pcf2127->cfg = config;

dev_set_drvdata(dev, pcf2127);

@@ -688,7 +716,7 @@ static int pcf2127_probe(struct device *dev, struct regmap *regmap,
set_bit(RTC_FEATURE_ALARM, pcf2127->rtc->features);
}

- if (is_pcf2127) {
+ if (pcf2127->cfg->has_nvmem) {
struct nvmem_config nvmem_cfg = {
.priv = pcf2127,
.reg_read = pcf2127_nvmem_read,
@@ -734,7 +762,7 @@ static int pcf2127_probe(struct device *dev, struct regmap *regmap,
PCF2127_BIT_WD_CTL_TF1 |
PCF2127_BIT_WD_CTL_TF0,
PCF2127_BIT_WD_CTL_CD1 |
- (is_pcf2127 ? PCF2127_BIT_WD_CTL_CD0 : 0) |
+ (pcf2127->cfg->has_bit_wd_ctl_cd0 ? PCF2127_BIT_WD_CTL_CD0 : 0) |
PCF2127_BIT_WD_CTL_TF1);
if (ret) {
dev_err(dev, "%s: watchdog config (wd_ctl) failed\n", __func__);
@@ -799,9 +827,9 @@ static int pcf2127_probe(struct device *dev, struct regmap *regmap,

#ifdef CONFIG_OF
static const struct of_device_id pcf2127_of_match[] = {
- { .compatible = "nxp,pcf2127" },
- { .compatible = "nxp,pcf2129" },
- { .compatible = "nxp,pca2129" },
+ { .compatible = "nxp,pcf2127", .data = &pcf21xx_cfg[PCF2127] },
+ { .compatible = "nxp,pcf2129", .data = &pcf21xx_cfg[PCF2129] },
+ { .compatible = "nxp,pca2129", .data = &pcf21xx_cfg[PCF2129] },
{}
};
MODULE_DEVICE_TABLE(of, pcf2127_of_match);
@@ -886,26 +914,40 @@ static const struct regmap_bus pcf2127_i2c_regmap = {
static struct i2c_driver pcf2127_i2c_driver;

static const struct i2c_device_id pcf2127_i2c_id[] = {
- { "pcf2127", 1 },
- { "pcf2129", 0 },
- { "pca2129", 0 },
+ { "pcf2127", PCF2127 },
+ { "pcf2129", PCF2129 },
+ { "pca2129", PCF2129 },
{ }
};
MODULE_DEVICE_TABLE(i2c, pcf2127_i2c_id);

static int pcf2127_i2c_probe(struct i2c_client *client)
{
- const struct i2c_device_id *id = i2c_match_id(pcf2127_i2c_id, client);
struct regmap *regmap;
- static const struct regmap_config config = {
+ static struct regmap_config config = {
.reg_bits = 8,
.val_bits = 8,
- .max_register = 0x1d,
};
+ const struct pcf21xx_config *variant;

if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
return -ENODEV;

+ if (client->dev.of_node) {
+ variant = of_device_get_match_data(&client->dev);
+ if (!variant)
+ return -ENODEV;
+ } else {
+ enum pcf21xx_type type =
+ i2c_match_id(pcf2127_i2c_id, client)->driver_data;
+
+ if (type >= PCF21XX_LAST_ID)
+ return -ENODEV;
+ variant = &pcf21xx_cfg[type];
+ }
+
+ config.max_register = variant->max_register,
+
regmap = devm_regmap_init(&client->dev, &pcf2127_i2c_regmap,
&client->dev, &config);
if (IS_ERR(regmap)) {
@@ -915,7 +957,7 @@ static int pcf2127_i2c_probe(struct i2c_client *client)
}

return pcf2127_probe(&client->dev, regmap, client->irq,
- pcf2127_i2c_driver.driver.name, id->driver_data);
+ pcf2127_i2c_driver.driver.name, variant);
}

static struct i2c_driver pcf2127_i2c_driver = {
@@ -953,17 +995,32 @@ static void pcf2127_i2c_unregister_driver(void)
#if IS_ENABLED(CONFIG_SPI_MASTER)

static struct spi_driver pcf2127_spi_driver;
+static const struct spi_device_id pcf2127_spi_id[];

static int pcf2127_spi_probe(struct spi_device *spi)
{
- static const struct regmap_config config = {
+ static struct regmap_config config = {
.reg_bits = 8,
.val_bits = 8,
.read_flag_mask = 0xa0,
.write_flag_mask = 0x20,
- .max_register = 0x1d,
};
struct regmap *regmap;
+ const struct pcf21xx_config *variant;
+
+ if (spi->dev.of_node) {
+ variant = of_device_get_match_data(&spi->dev);
+ if (!variant)
+ return -ENODEV;
+ } else {
+ enum pcf21xx_type type = spi_get_device_id(spi)->driver_data;
+
+ if (type >= PCF21XX_LAST_ID)
+ return -ENODEV;
+ variant = &pcf21xx_cfg[type];
+ }
+
+ config.max_register = variant->max_register,

regmap = devm_regmap_init_spi(spi, &config);
if (IS_ERR(regmap)) {
@@ -974,13 +1031,13 @@ static int pcf2127_spi_probe(struct spi_device *spi)

return pcf2127_probe(&spi->dev, regmap, spi->irq,
pcf2127_spi_driver.driver.name,
- spi_get_device_id(spi)->driver_data);
+ variant);
}

static const struct spi_device_id pcf2127_spi_id[] = {
- { "pcf2127", 1 },
- { "pcf2129", 0 },
- { "pca2129", 0 },
+ { "pcf2127", PCF2127 },
+ { "pcf2129", PCF2129 },
+ { "pca2129", PCF2129 },
{ }
};
MODULE_DEVICE_TABLE(spi, pcf2127_spi_id);
--
2.30.2
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