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Date:   Mon, 19 Dec 2022 10:15:26 -0500
From:   Hugo Villeneuve <hugo@hugovil.com>
To:     Bruno Thomsen <bruno.thomsen@gmail.com>
Cc:     a.zummo@towertech.it, alexandre.belloni@bootlin.com,
        robh+dt@kernel.org, krzysztof.kozlowski+dt@linaro.org,
        linux-rtc@vger.kernel.org, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org,
        Hugo Villeneuve <hvilleneuve@dimonoff.com>, hugo@hugovil.com
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        <20221215150214.1109074-2-hugo@hugovil.com>
        <CAH+2xPDW04NKD34RjcLO=HP1_KDxe9dvbLC9B4Rv+i3O8S58qQ@mail.gmail.com>
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Subject: Re: [PATCH v3 01/14] rtc: pcf2127: add variant-specific
 configuration structure
Precedence: bulk

On Mon, 19 Dec 2022 10:05:53 +0100
Bruno Thomsen <bruno.thomsen@gmail.com> wrote:

> Den tor. 15. dec. 2022 kl. 16.19 skrev Hugo Villeneuve <hugo@hugovil.com>:
> >
> > 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;
> 
> Hi Hugo,
> 
> Patch series does not apply on 6.1 tree as pcf2127_i2c_probe() call
> signature does not match[1].
> 
> static int pcf2127_i2c_probe(struct i2c_client *client,
>       const struct i2c_device_id *id)
> 
> 
> [1] https://elixir.bootlin.com/linux/v6.1/source/drivers/rtc/rtc-pcf2127.c#L888
> 
> /Bruno

Hi Bruno,
I based my driver on the git://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux.git repo, as indicated in the MAINTAINERS file for the RTC subsystem (T: entry). I used the rtc-next branch on this repo.

Can you tell me exactly which repo and branch I need to use to resubmit the driver?

Thank you, Hugo.


> >         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
> >
> 


-- 
Hugo Villeneuve <hugo@hugovil.com>