The syscon driver is based on regmap, which offers the possibility to declare registers as readable/writable or not, thanks to rd_table and wr_table.
This patch takes register map's holes description from DT, and fills in the rd_table and wr_table of the corresponding syson instance accordingly. Signed-off-by: Seraphin Bonnaffe <[email protected]> --- drivers/mfd/syscon.c | 35 +++++++++++++++++++++++++++++++++++ 1 file changed, 35 insertions(+) diff --git a/drivers/mfd/syscon.c b/drivers/mfd/syscon.c index ca15878..2bfb45d 100644 --- a/drivers/mfd/syscon.c +++ b/drivers/mfd/syscon.c @@ -125,9 +125,15 @@ static int syscon_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct syscon_platform_data *pdata = dev_get_platdata(dev); + struct device_node *np = dev->of_node; + struct regmap_access_table *syscon_rw_table; + struct regmap_range *holes; struct syscon *syscon; struct resource *res; void __iomem *base; + const __be32 *hole_prop; + u32 min, max, size; + u32 i, hlen, ngaps; syscon = devm_kzalloc(dev, sizeof(*syscon), GFP_KERNEL); if (!syscon) @@ -141,6 +147,35 @@ static int syscon_probe(struct platform_device *pdev) if (!base) return -ENOMEM; + hole_prop = of_get_property(np, "holes", &hlen); + if (hole_prop) { + hlen /= sizeof(*hole_prop); + ngaps = hlen / 2; + + holes = devm_kzalloc(dev, ngaps * sizeof(*holes), GFP_KERNEL); + if (!holes) + return -ENOMEM; + + for (i = 0; i < ngaps; i++) { + min = (u32)of_read_number(&hole_prop[i * 2], 1); + size = (u32)of_read_number(&hole_prop[i * 2 + 1], 1); + max = min + size - 1; + + holes[i].range_min = min; + holes[i].range_max = max; + } + syscon_rw_table = devm_kzalloc(dev, sizeof(*syscon_rw_table), + GFP_KERNEL); + if (!syscon_rw_table) + return -ENOMEM; + + syscon_rw_table->no_ranges = holes; + syscon_rw_table->n_no_ranges = ngaps; + + syscon_regmap_config.rd_table = syscon_rw_table; + syscon_regmap_config.wr_table = syscon_rw_table; + } + syscon_regmap_config.max_register = res->end - res->start - 3; if (pdata) syscon_regmap_config.name = pdata->label; -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
