[source] generic: rtl8366s: add support support for initvals from DTS

[LEDE Commits]

mkresin pushed a commit to source.git, branch master:
https://git.lede-project.org/30494598f891fc4436a49eca55fc31d03c087841

commit 30494598f891fc4436a49eca55fc31d03c087841
Author: Tobias Wolf <github-NTEO at vplace.de>
AuthorDate: Wed Jan 25 16:22:13 2017 +0100

    generic: rtl8366s: add support support for initvals from DTS
    
    This change provides the possibility to define per-device initvals in
    the DTS file for a rlt8366s switch.
    
    Signed-off-by: Tobias Wolf <github-NTEO at vplace.de>
---
 .../linux/generic/files/drivers/net/phy/rtl8366s.c | 29 ++++++++++++++++++++--
 1 file changed, 27 insertions(+), 2 deletions(-)

diff --git a/target/linux/generic/files/drivers/net/phy/rtl8366s.c b/target/linux/generic/files/drivers/net/phy/rtl8366s.c
index 3dc2a87..b54b4b1 100644
--- a/target/linux/generic/files/drivers/net/phy/rtl8366s.c
+++ b/target/linux/generic/files/drivers/net/phy/rtl8366s.c
@@ -254,17 +254,42 @@ static int rtl8366s_setup(struct rtl8366_smi *smi)
 {
 	struct rtl8366_platform_data *pdata;
 	int err;
+	unsigned i;
+#ifdef CONFIG_OF
+	struct device_node *np;
+	unsigned num_initvals;
+	const __be32 *paddr;
+#endif
 
 	pdata = smi->parent->platform_data;
 	if (pdata && pdata->num_initvals && pdata->initvals) {
-		unsigned i;
-
 		dev_info(smi->parent, "applying initvals\n");
 		for (i = 0; i < pdata->num_initvals; i++)
 			REG_WR(smi, pdata->initvals[i].reg,
 			       pdata->initvals[i].val);
 	}
 
+#ifdef CONFIG_OF
+	np = smi->parent->of_node;
+
+	paddr = of_get_property(np, "realtek,initvals", &num_initvals);
+	if (paddr) {
+		dev_info(smi->parent, "applying initvals from DTS\n");
+
+		if (num_initvals < (2 * sizeof(*paddr)))
+			return -EINVAL;
+
+		num_initvals /= sizeof(*paddr);
+
+		for (i = 0; i < num_initvals - 1; i += 2) {
+			u32 reg = be32_to_cpup(paddr + i);
+			u32 val = be32_to_cpup(paddr + i + 1);
+
+			REG_WR(smi, reg, val);
+		}
+	}
+#endif
+
 	/* set maximum packet length to 1536 bytes */
 	REG_RMW(smi, RTL8366S_SGCR, RTL8366S_SGCR_MAX_LENGTH_MASK,
 		RTL8366S_SGCR_MAX_LENGTH_1536);