From 15c6a048e5f00af108fb9f9e56ca5bd38e11b1a6 Mon Sep 17 00:00:00 2001
From: Swapnil Jakhade <sjakhade@cadence.com>
Date: Thu, 17 Sep 2020 09:30:36 +0200
Subject: phy: cadence-torrent: Add PHY APB reset support
Add support for PHY APB reset and make it optional.
Signed-off-by: Swapnil Jakhade <sjakhade@cadence.com>
Link: https://lore.kernel.org/r/1600327846-9733-4-git-send-email-sjakhade@cadence.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
---
drivers/phy/cadence/phy-cadence-torrent.c | 13 +++++++++++++
1 file changed, 13 insertions(+)
(limited to 'drivers/phy')
diff --git a/drivers/phy/cadence/phy-cadence-torrent.c b/drivers/phy/cadence/phy-cadence-torrent.c
index 9e900f389b08..1d0c9bb7cfa0 100644
--- a/drivers/phy/cadence/phy-cadence-torrent.c
+++ b/drivers/phy/cadence/phy-cadence-torrent.c
@@ -228,6 +228,7 @@ struct cdns_torrent_phy {
void __iomem *sd_base; /* SD0801 registers base */
u32 max_bit_rate; /* Maximum link bit rate to use (in Mbps) */
struct reset_control *phy_rst;
+ struct reset_control *apb_rst;
struct device *dev;
struct clk *clk;
unsigned long ref_clk_rate;
@@ -1883,6 +1884,13 @@ static int cdns_torrent_phy_probe(struct platform_device *pdev)
return PTR_ERR(cdns_phy->phy_rst);
}
+ cdns_phy->apb_rst = devm_reset_control_get_optional(dev, "torrent_apb");
+ if (IS_ERR(cdns_phy->apb_rst)) {
+ dev_err(dev, "%s: failed to get apb reset\n",
+ dev->of_node->full_name);
+ return PTR_ERR(cdns_phy->apb_rst);
+ }
+
cdns_phy->clk = devm_clk_get(dev, "refclk");
if (IS_ERR(cdns_phy->clk)) {
dev_err(dev, "phy ref clock not found\n");
@@ -1907,6 +1915,9 @@ static int cdns_torrent_phy_probe(struct platform_device *pdev)
if (ret)
return ret;
+ /* Enable APB */
+ reset_control_deassert(cdns_phy->apb_rst);
+
for_each_available_child_of_node(dev->of_node, child) {
struct phy *gphy;
@@ -2059,6 +2070,7 @@ put_lnk_rst:
for (i = 0; i < node; i++)
reset_control_put(cdns_phy->phys[i].lnk_rst);
of_node_put(child);
+ reset_control_assert(cdns_phy->apb_rst);
return ret;
}
@@ -2068,6 +2080,7 @@ static int cdns_torrent_phy_remove(struct platform_device *pdev)
int i;
reset_control_assert(cdns_phy->phy_rst);
+ reset_control_assert(cdns_phy->apb_rst);
for (i = 0; i < cdns_phy->nsubnodes; i++) {
reset_control_assert(cdns_phy->phys[i].lnk_rst);
reset_control_put(cdns_phy->phys[i].lnk_rst);
--
cgit