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>

diff --git a/drivers/phy/cadence/phy-cadence-torrent.c b/drivers/phy/cadence/phy-cadence-torrent.c
index 9e900f389b08c8c83f154a33a9d6befeab097731..1d0c9bb7cfa045372ba21932a314d72e65ce0cf9 100644 (file)
--- 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);