[PATCH v2 03/13] phy: cadence-torrent: Add PHY APB reset support

From: Swapnil Jakhade
Date: Thu Aug 27 2020 - 12:17:16 EST


Add support for PHY APB reset and make it optional.

Signed-off-by: Swapnil Jakhade <sjakhade@xxxxxxxxxxx>
---
drivers/phy/cadence/phy-cadence-torrent.c | 13 +++++++++++++
1 file changed, 13 insertions(+)

diff --git a/drivers/phy/cadence/phy-cadence-torrent.c b/drivers/phy/cadence/phy-cadence-torrent.c
index af307af2f221..3038b50c7b12 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;
@@ -1884,6 +1885,13 @@ 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");
@@ -1908,6 +1916,9 @@ 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;

@@ -2062,6 +2073,7 @@ static int cdns_torrent_phy_probe(struct platform_device *pdev)
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;
}

@@ -2071,6 +2083,7 @@ 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);
--
2.26.1