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140 lines
3.8 KiB
Diff
140 lines
3.8 KiB
Diff
From 9dce908d64ffb8b0ab71cb3a4b79db398d2e6dc3 Mon Sep 17 00:00:00 2001
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From: Chunfeng Yun <chunfeng.yun@mediatek.com>
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Date: Fri, 13 Oct 2017 16:26:38 +0800
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Subject: [PATCH 131/224] usb: xhci-mtk: add optional mcu and dma bus clocks
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There are mcu_bus and dma_bus clocks needed to be controlled by
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driver on some SoCs, so add them as optional ones
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Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
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Acked-by: Mathias Nyman <mathias.nyman@linux.intel.com>
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Reviewed-by: Matthias Brugger <matthias.bgg@gmail.com>
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Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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---
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drivers/usb/host/xhci-mtk.c | 79 ++++++++++++++++++++++++++++++++++-----------
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drivers/usb/host/xhci-mtk.h | 2 ++
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2 files changed, 62 insertions(+), 19 deletions(-)
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--- a/drivers/usb/host/xhci-mtk.c
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+++ b/drivers/usb/host/xhci-mtk.c
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@@ -221,6 +221,44 @@ static int xhci_mtk_ssusb_config(struct
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return xhci_mtk_host_enable(mtk);
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}
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+/* ignore the error if the clock does not exist */
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+static struct clk *optional_clk_get(struct device *dev, const char *id)
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+{
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+ struct clk *opt_clk;
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+
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+ opt_clk = devm_clk_get(dev, id);
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+ /* ignore error number except EPROBE_DEFER */
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+ if (IS_ERR(opt_clk) && (PTR_ERR(opt_clk) != -EPROBE_DEFER))
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+ opt_clk = NULL;
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+
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+ return opt_clk;
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+}
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+
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+static int xhci_mtk_clks_get(struct xhci_hcd_mtk *mtk)
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+{
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+ struct device *dev = mtk->dev;
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+
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+ mtk->sys_clk = devm_clk_get(dev, "sys_ck");
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+ if (IS_ERR(mtk->sys_clk)) {
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+ dev_err(dev, "fail to get sys_ck\n");
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+ return PTR_ERR(mtk->sys_clk);
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+ }
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+
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+ mtk->ref_clk = optional_clk_get(dev, "ref_ck");
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+ if (IS_ERR(mtk->ref_clk))
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+ return PTR_ERR(mtk->ref_clk);
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+
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+ mtk->mcu_clk = optional_clk_get(dev, "mcu_ck");
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+ if (IS_ERR(mtk->mcu_clk))
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+ return PTR_ERR(mtk->mcu_clk);
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+
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+ mtk->dma_clk = optional_clk_get(dev, "dma_ck");
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+ if (IS_ERR(mtk->dma_clk))
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+ return PTR_ERR(mtk->dma_clk);
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+
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+ return 0;
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+}
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+
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static int xhci_mtk_clks_enable(struct xhci_hcd_mtk *mtk)
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{
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int ret;
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@@ -237,16 +275,34 @@ static int xhci_mtk_clks_enable(struct x
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goto sys_clk_err;
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}
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+ ret = clk_prepare_enable(mtk->mcu_clk);
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+ if (ret) {
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+ dev_err(mtk->dev, "failed to enable mcu_clk\n");
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+ goto mcu_clk_err;
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+ }
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+
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+ ret = clk_prepare_enable(mtk->dma_clk);
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+ if (ret) {
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+ dev_err(mtk->dev, "failed to enable dma_clk\n");
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+ goto dma_clk_err;
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+ }
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+
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return 0;
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+dma_clk_err:
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+ clk_disable_unprepare(mtk->mcu_clk);
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+mcu_clk_err:
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+ clk_disable_unprepare(mtk->sys_clk);
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sys_clk_err:
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clk_disable_unprepare(mtk->ref_clk);
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ref_clk_err:
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- return -EINVAL;
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+ return ret;
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}
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static void xhci_mtk_clks_disable(struct xhci_hcd_mtk *mtk)
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{
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+ clk_disable_unprepare(mtk->dma_clk);
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+ clk_disable_unprepare(mtk->mcu_clk);
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clk_disable_unprepare(mtk->sys_clk);
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clk_disable_unprepare(mtk->ref_clk);
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}
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@@ -529,24 +585,9 @@ static int xhci_mtk_probe(struct platfor
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return PTR_ERR(mtk->vusb33);
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}
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- mtk->sys_clk = devm_clk_get(dev, "sys_ck");
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- if (IS_ERR(mtk->sys_clk)) {
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- dev_err(dev, "fail to get sys_ck\n");
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- return PTR_ERR(mtk->sys_clk);
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- }
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-
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- /*
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- * reference clock is usually a "fixed-clock", make it optional
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- * for backward compatibility and ignore the error if it does
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- * not exist.
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- */
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- mtk->ref_clk = devm_clk_get(dev, "ref_ck");
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- if (IS_ERR(mtk->ref_clk)) {
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- if (PTR_ERR(mtk->ref_clk) == -EPROBE_DEFER)
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- return -EPROBE_DEFER;
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-
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- mtk->ref_clk = NULL;
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- }
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+ ret = xhci_mtk_clks_get(mtk);
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+ if (ret)
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+ return ret;
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mtk->lpm_support = of_property_read_bool(node, "usb3-lpm-capable");
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/* optional property, ignore the error if it does not exist */
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--- a/drivers/usb/host/xhci-mtk.h
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+++ b/drivers/usb/host/xhci-mtk.h
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@@ -126,6 +126,8 @@ struct xhci_hcd_mtk {
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struct regulator *vbus;
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struct clk *sys_clk; /* sys and mac clock */
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struct clk *ref_clk;
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+ struct clk *mcu_clk;
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+ struct clk *dma_clk;
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struct regmap *pericfg;
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struct phy **phys;
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int num_phys;
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