linux-kernel - [PATCH v4 1/5] clk: JZ4780: Add function for disable the second core.

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Message-Id: <1608565971-23895-2-git-send-email-zhouyanjie@wanyeetech.com>
Date:   Mon, 21 Dec 2020 23:52:47 +0800
From:   周琰杰 (Zhou Yanjie) 
        <zhouyanjie@...yeetech.com>
To:     sboyd@...nel.org, robh+dt@...nel.org
Cc:     linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org,
        devicetree@...r.kernel.org, mturquette@...libre.com,
        dongsheng.qiu@...enic.com, aric.pzqi@...enic.com,
        rick.tyliu@...enic.com, yanfei.li@...enic.com,
        sihui.liu@...enic.com, sernia.zhou@...mail.com,
        paul@...pouillou.net
Subject: [PATCH v4 1/5] clk: JZ4780: Add function for disable the second core.

Add "jz4780_core1_disable()" for disable the second core of JZ4780,
prepare for later commits.

Signed-off-by: 周琰杰 (Zhou Yanjie) <zhouyanjie@...yeetech.com>
Reviewed-by: Paul Cercueil <paul@...pouillou.net>
---

Notes:
    v1->v2:
    Add Paul Cercueil's Reviewed-by.
    
    v2->v3:
    No change.
    
    v3->v4:
    No change.

 drivers/clk/ingenic/jz4780-cgu.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/drivers/clk/ingenic/jz4780-cgu.c b/drivers/clk/ingenic/jz4780-cgu.c
index 0268d23..dcca74e 100644
--- a/drivers/clk/ingenic/jz4780-cgu.c
+++ b/drivers/clk/ingenic/jz4780-cgu.c
@@ -252,8 +252,29 @@ static int jz4780_core1_enable(struct clk_hw *hw)
 	return 0;
 }
 
+static void jz4780_core1_disable(struct clk_hw *hw)
+{
+	struct ingenic_clk *ingenic_clk = to_ingenic_clk(hw);
+	struct ingenic_cgu *cgu = ingenic_clk->cgu;
+	unsigned long flags;
+	u32 lcr, clkgr1;
+
+	spin_lock_irqsave(&cgu->lock, flags);
+
+	lcr = readl(cgu->base + CGU_REG_LCR);
+	lcr |= LCR_PD_SCPU;
+	writel(lcr, cgu->base + CGU_REG_LCR);
+
+	clkgr1 = readl(cgu->base + CGU_REG_CLKGR1);
+	clkgr1 |= CLKGR1_CORE1;
+	writel(clkgr1, cgu->base + CGU_REG_CLKGR1);
+
+	spin_unlock_irqrestore(&cgu->lock, flags);
+}
+
 static const struct clk_ops jz4780_core1_ops = {
 	.enable = jz4780_core1_enable,
+	.disable = jz4780_core1_disable,
 };
 
 static const s8 pll_od_encoding[16] = {
-- 
2.7.4