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Date:   Mon, 19 Dec 2022 13:30:27 -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>
Message-Id: <20221219133027.dda8477361818de266df25fb@hugovil.com>
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        <20221219101526.ab27daa0971e827128d51a15@hugovil.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 18:17:45 +0100
Bruno Thomsen <bruno.thomsen@gmail.com> wrote:

> Hi Hugo,
> 
> Looking more into it I think you based it against the right tree,
> but if you use --base= when doing format-patch it's easier to spot :)
> I only use torvalds tree when testing patches on a device.
> 
> /Bruno

Hi Bruno,
thanks for the tip, I will use "--base=" for V4.

Hugo.


> Den man. 19. dec. 2022 kl. 16.15 skrev Hugo Villeneuve <hugo@hugovil.com>:
> >
> > 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>
> 


-- 
Hugo Villeneuve <hugo@hugovil.com>