--- /dev/null
+From 677805f6d83524717b46b3cde74aa455dbf6299f Mon Sep 17 00:00:00 2001
+From: Chunfeng Yun <chunfeng.yun@mediatek.com>
+Date: Fri, 13 Oct 2017 17:10:40 +0800
+Subject: [PATCH 106/224] usb: mtu3: add optional mcu and dma bus clocks
+
+There are mcu_bus and dma_bus clocks needed to be turned on/off by
+driver on some SoCs, so add them as optional ones
+
+Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
+Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
+---
+ drivers/usb/mtu3/mtu3.h | 5 ++
+ drivers/usb/mtu3/mtu3_plat.c | 121 +++++++++++++++++++++++++++++--------------
+ 2 files changed, 86 insertions(+), 40 deletions(-)
+
+diff --git a/drivers/usb/mtu3/mtu3.h b/drivers/usb/mtu3/mtu3.h
+index 6d3278e46431..2795294ec92a 100644
+--- a/drivers/usb/mtu3/mtu3.h
++++ b/drivers/usb/mtu3/mtu3.h
+@@ -206,6 +206,9 @@ struct otg_switch_mtk {
+ * @ippc_base: register base address of IP Power and Clock interface (IPPC)
+ * @vusb33: usb3.3V shared by device/host IP
+ * @sys_clk: system clock of mtu3, shared by device/host IP
++ * @ref_clk: reference clock
++ * @mcu_clk: mcu_bus_ck clock for AHB bus etc
++ * @dma_clk: dma_bus_ck clock for AXI bus etc
+ * @dr_mode: works in which mode:
+ * host only, device only or dual-role mode
+ * @u2_ports: number of usb2.0 host ports
+@@ -226,6 +229,8 @@ struct ssusb_mtk {
+ struct regulator *vusb33;
+ struct clk *sys_clk;
+ struct clk *ref_clk;
++ struct clk *mcu_clk;
++ struct clk *dma_clk;
+ /* otg */
+ struct otg_switch_mtk otg_switch;
+ enum usb_dr_mode dr_mode;
+diff --git a/drivers/usb/mtu3/mtu3_plat.c b/drivers/usb/mtu3/mtu3_plat.c
+index 9edad30c8ae5..fb8992011bde 100644
+--- a/drivers/usb/mtu3/mtu3_plat.c
++++ b/drivers/usb/mtu3/mtu3_plat.c
+@@ -110,15 +110,9 @@ static void ssusb_phy_power_off(struct ssusb_mtk *ssusb)
+ phy_power_off(ssusb->phys[i]);
+ }
+
+-static int ssusb_rscs_init(struct ssusb_mtk *ssusb)
++static int ssusb_clks_enable(struct ssusb_mtk *ssusb)
+ {
+- int ret = 0;
+-
+- ret = regulator_enable(ssusb->vusb33);
+- if (ret) {
+- dev_err(ssusb->dev, "failed to enable vusb33\n");
+- goto vusb33_err;
+- }
++ int ret;
+
+ ret = clk_prepare_enable(ssusb->sys_clk);
+ if (ret) {
+@@ -132,6 +126,52 @@ static int ssusb_rscs_init(struct ssusb_mtk *ssusb)
+ goto ref_clk_err;
+ }
+
++ ret = clk_prepare_enable(ssusb->mcu_clk);
++ if (ret) {
++ dev_err(ssusb->dev, "failed to enable mcu_clk\n");
++ goto mcu_clk_err;
++ }
++
++ ret = clk_prepare_enable(ssusb->dma_clk);
++ if (ret) {
++ dev_err(ssusb->dev, "failed to enable dma_clk\n");
++ goto dma_clk_err;
++ }
++
++ return 0;
++
++dma_clk_err:
++ clk_disable_unprepare(ssusb->mcu_clk);
++mcu_clk_err:
++ clk_disable_unprepare(ssusb->ref_clk);
++ref_clk_err:
++ clk_disable_unprepare(ssusb->sys_clk);
++sys_clk_err:
++ return ret;
++}
++
++static void ssusb_clks_disable(struct ssusb_mtk *ssusb)
++{
++ clk_disable_unprepare(ssusb->dma_clk);
++ clk_disable_unprepare(ssusb->mcu_clk);
++ clk_disable_unprepare(ssusb->ref_clk);
++ clk_disable_unprepare(ssusb->sys_clk);
++}
++
++static int ssusb_rscs_init(struct ssusb_mtk *ssusb)
++{
++ int ret = 0;
++
++ ret = regulator_enable(ssusb->vusb33);
++ if (ret) {
++ dev_err(ssusb->dev, "failed to enable vusb33\n");
++ goto vusb33_err;
++ }
++
++ ret = ssusb_clks_enable(ssusb);
++ if (ret)
++ goto clks_err;
++
+ ret = ssusb_phy_init(ssusb);
+ if (ret) {
+ dev_err(ssusb->dev, "failed to init phy\n");
+@@ -149,20 +189,16 @@ static int ssusb_rscs_init(struct ssusb_mtk *ssusb)
+ phy_err:
+ ssusb_phy_exit(ssusb);
+ phy_init_err:
+- clk_disable_unprepare(ssusb->ref_clk);
+-ref_clk_err:
+- clk_disable_unprepare(ssusb->sys_clk);
+-sys_clk_err:
++ ssusb_clks_disable(ssusb);
++clks_err:
+ regulator_disable(ssusb->vusb33);
+ vusb33_err:
+-
+ return ret;
+ }
+
+ static void ssusb_rscs_exit(struct ssusb_mtk *ssusb)
+ {
+- clk_disable_unprepare(ssusb->sys_clk);
+- clk_disable_unprepare(ssusb->ref_clk);
++ ssusb_clks_disable(ssusb);
+ regulator_disable(ssusb->vusb33);
+ ssusb_phy_power_off(ssusb);
+ ssusb_phy_exit(ssusb);
+@@ -203,6 +239,19 @@ static int get_iddig_pinctrl(struct ssusb_mtk *ssusb)
+ return 0;
+ }
+
++/* ignore the error if the clock does not exist */
++static struct clk *get_optional_clk(struct device *dev, const char *id)
++{
++ struct clk *opt_clk;
++
++ opt_clk = devm_clk_get(dev, id);
++ /* ignore error number except EPROBE_DEFER */
++ if (IS_ERR(opt_clk) && (PTR_ERR(opt_clk) != -EPROBE_DEFER))
++ opt_clk = NULL;
++
++ return opt_clk;
++}
++
+ static int get_ssusb_rscs(struct platform_device *pdev, struct ssusb_mtk *ssusb)
+ {
+ struct device_node *node = pdev->dev.of_node;
+@@ -225,18 +274,17 @@ static int get_ssusb_rscs(struct platform_device *pdev, struct ssusb_mtk *ssusb)
+ return PTR_ERR(ssusb->sys_clk);
+ }
+
+- /*
+- * reference clock is usually a "fixed-clock", make it optional
+- * for backward compatibility and ignore the error if it does
+- * not exist.
+- */
+- ssusb->ref_clk = devm_clk_get(dev, "ref_ck");
+- if (IS_ERR(ssusb->ref_clk)) {
+- if (PTR_ERR(ssusb->ref_clk) == -EPROBE_DEFER)
+- return -EPROBE_DEFER;
++ ssusb->ref_clk = get_optional_clk(dev, "ref_ck");
++ if (IS_ERR(ssusb->ref_clk))
++ return PTR_ERR(ssusb->ref_clk);
+
+- ssusb->ref_clk = NULL;
+- }
++ ssusb->mcu_clk = get_optional_clk(dev, "mcu_ck");
++ if (IS_ERR(ssusb->mcu_clk))
++ return PTR_ERR(ssusb->mcu_clk);
++
++ ssusb->dma_clk = get_optional_clk(dev, "dma_ck");
++ if (IS_ERR(ssusb->dma_clk))
++ return PTR_ERR(ssusb->dma_clk);
+
+ ssusb->num_phys = of_count_phandle_with_args(node,
+ "phys", "#phy-cells");
+@@ -451,8 +499,7 @@ static int __maybe_unused mtu3_suspend(struct device *dev)
+
+ ssusb_host_disable(ssusb, true);
+ ssusb_phy_power_off(ssusb);
+- clk_disable_unprepare(ssusb->sys_clk);
+- clk_disable_unprepare(ssusb->ref_clk);
++ ssusb_clks_disable(ssusb);
+ ssusb_wakeup_enable(ssusb);
+
+ return 0;
+@@ -470,27 +517,21 @@ static int __maybe_unused mtu3_resume(struct device *dev)
+ return 0;
+
+ ssusb_wakeup_disable(ssusb);
+- ret = clk_prepare_enable(ssusb->sys_clk);
+- if (ret)
+- goto err_sys_clk;
+-
+- ret = clk_prepare_enable(ssusb->ref_clk);
++ ret = ssusb_clks_enable(ssusb);
+ if (ret)
+- goto err_ref_clk;
++ goto clks_err;
+
+ ret = ssusb_phy_power_on(ssusb);
+ if (ret)
+- goto err_power_on;
++ goto phy_err;
+
+ ssusb_host_enable(ssusb);
+
+ return 0;
+
+-err_power_on:
+- clk_disable_unprepare(ssusb->ref_clk);
+-err_ref_clk:
+- clk_disable_unprepare(ssusb->sys_clk);
+-err_sys_clk:
++phy_err:
++ ssusb_clks_disable(ssusb);
++clks_err:
+ return ret;
+ }
+
+--
+2.11.0
+
projects / openwrt / staging / blogic.git / blobdiff