> > + * of_regmap_endian_by_type() - Parse and lookup the endian referenced
> > + * by a device node
> > + * @np: pointer to clock consumer node
>
> This is not the clock consumer, right?
>
Yes, you are right.
I will fix it.
> > + * @type: type of consumer's endian input
> > + *
> > + * This function parses the device endian property, and uses them to
> > + * determine the endian of the registers and values.
> > + */
> > +static int of_regmap_endian_by_type(struct device_node *np,
> > + enum regmap_endian_type type,
> > + enum regmap_endian *endian)
> > +{
> > + if (!endian)
> > + return -EINVAL;
> > +
> > + switch (type) {
> > + case REGMAP_ENDIAN_REG:
> > + if (of_property_read_bool(np, "big-endian-reg"))
> > + *endian = REGMAP_ENDIAN_BIG;
> > + else if (of_property_read_bool(np, "little-endian-reg"))
> > + *endian = REGMAP_ENDIAN_LITTLE;
> > + else
> > + *endian = REGMAP_ENDIAN_NATIVE;
>
> You could also return an error code here as there was no DT property
> found. This doesn't change to much in the code, just an idea.
>
The properties are all Boolean ones, and returning an error code here
is not proper. Isn't it ?
Returning _NATIVE here means to indicate that the the CPU and DEV are in
the same endianness mode...
Thanks very much,
BRs
Xiubo
> Regards,
>
> Markus
>
> > + break;
> > + case REGMAP_ENDIAN_VAL:
> > + if (of_property_read_bool(np, "big-endian-val"))
> > + *endian = REGMAP_ENDIAN_BIG;
> > + else if (of_property_read_bool(np, "little-endian-val"))
> > + *endian = REGMAP_ENDIAN_LITTLE;
> > + else
> > + *endian = REGMAP_ENDIAN_NATIVE;
> > + break;
> > + default:
> > + return -EINVAL;
> > + }
> > +
> > + return 0;
> > +}
> > +
> > +static int of_regmap_get_endian(struct device *dev,
> > + const struct regmap_bus *bus,
> > + const struct regmap_config *config,
> > + enum regmap_endian_type type,
> > + enum regmap_endian *endian)
> > +{
> > + int ret;
> > +
> > + if (!endian || !config)
> > + return -EINVAL;
> > +
> > + /*
> > + * Firstly, try to parse the endian from driver's config,
> > + * this is to be compatible with the none DT or the old drivers.
> > + * From the driver's config the endian value maybe:
> > + * REGMAP_ENDIAN_BIG,
> > + * REGMAP_ENDIAN_LITTLE,
> > + * REGMAP_ENDIAN_NATIVE,
> > + * REGMAP_ENDIAN_DEFAULT.
> > + */
> > + switch (type) {
> > + case REGMAP_ENDIAN_REG:
> > + *endian = config->reg_format_endian;
> > + break;
> > + case REGMAP_ENDIAN_VAL:
> > + *endian = config->val_format_endian;
> > + break;
> > + default:
> > + return -EINVAL;
> > + }
> > +
> > + /*
> > + * If the endian parsing from driver's config is REGMAP_ENDIAN_DEFAULT,
> > + * that means maybe we are using the DT node to specify the endianness.
> > + */
> > + if (*endian != REGMAP_ENDIAN_DEFAULT)
> > + return 0;
> > +
> > + /*
> > + * Secondly, try to parse the endian from DT node if the
> > + * driver config does not specify it.
> > + * From the DT node the endian value maybe:
> > + * REGMAP_ENDIAN_BIG,
> > + * REGMAP_ENDIAN_LITTLE,
> > + * REGMAP_ENDIAN_NATIVE,
> > + */
> > + if (dev) {
> > + ret = of_regmap_endian_by_type(dev->of_node, type, endian);
> > + if (ret < 0)
> > + return ret;
> > + }
> > +
> > + /*
> > + * If the endian parsing from DT node is REGMAP_ENDIAN_NATIVE, that
> > + * maybe means the DT does not care the endianness or it should use
> > + * the regmap bus's default endianness, then we should try to check
> > + * whether the regmap bus has specified the default endianess.
> > + */
> > + if (*endian != REGMAP_ENDIAN_NATIVE)
> > + return 0;
> > +
> > + /*
> > + * Finally, try to parse the endian from regmap bus config
> > + * if in device's DT node the endian property is absent.
> > + */
> > + switch (type) {
> > + case REGMAP_ENDIAN_REG:
> > + if (bus && bus->reg_format_endian_default)
> > + *endian = bus->reg_format_endian_default;
> > + break;
> > + case REGMAP_ENDIAN_VAL:
> > + if (bus && bus->val_format_endian_default)
> > + *endian = bus->val_format_endian_default;
> > + break;
> > + default:
> > + return -EINVAL;
> > + }
> > +
> > + return 0;
> > +}
> > +
> > /**
> > * regmap_init(): Initialise register map
> > *
> > @@ -518,17 +645,15 @@ struct regmap *regmap_init(struct device *dev,
> > map->reg_read = _regmap_bus_read;
> > }
> >
> > - reg_endian = config->reg_format_endian;
> > - if (reg_endian == REGMAP_ENDIAN_DEFAULT)
> > - reg_endian = bus->reg_format_endian_default;
> > - if (reg_endian == REGMAP_ENDIAN_DEFAULT)
> > - reg_endian = REGMAP_ENDIAN_BIG;
> > -
> > - val_endian = config->val_format_endian;
> > - if (val_endian == REGMAP_ENDIAN_DEFAULT)
> > - val_endian = bus->val_format_endian_default;
> > - if (val_endian == REGMAP_ENDIAN_DEFAULT)
> > - val_endian = REGMAP_ENDIAN_BIG;
> > + ret = of_regmap_get_endian(dev, bus, config, REGMAP_ENDIAN_REG,
> > + ®_endian);
> > + if (ret)
> > + return ERR_PTR(ret);
> > +
> > + ret = of_regmap_get_endian(dev, bus, config, REGMAP_ENDIAN_VAL,
> > + &val_endian);
> > + if (ret)
> > + return ERR_PTR(ret);
> >
> > switch (config->reg_bits + map->reg_shift) {
> > case 2:
> > --
> > 1.8.4
> >
> >
>
> --
> Pengutronix e.K. | |
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