linux-kernel - [RFC 2/4] clk: Add clk_gate_ro

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Message-Id: <1603301815-24670-3-git-send-email-abel.vesa@nxp.com>
Date:   Wed, 21 Oct 2020 20:36:53 +0300
From:   Abel Vesa <abel.vesa@....com>
To:     Shawn Guo <shawnguo@...nel.org>, Stephen Boyd <sboyd@...nel.org>,
        Peng Fan <peng.fan@....com>,
        Dong Aisheng <aisheng.dong@....com>,
        Anson Huang <anson.huang@....com>
Cc:     NXP Linux Team <linux-imx@....com>, linux-clk@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Abel Vesa <abel.vesa@....com>
Subject: [RFC 2/4] clk: Add clk_gate_ro_ops for read-only gate clocks

The clocks that can be changed from outside of the clock common framework
scope (for example, EL3) need to have only the .is_enabled gate op.

Signed-off-by: Abel Vesa <abel.vesa@....com>
---
 drivers/clk/clk-gate.c       | 5 +++++
 include/linux/clk-provider.h | 1 +
 2 files changed, 6 insertions(+)

diff --git a/drivers/clk/clk-gate.c b/drivers/clk/clk-gate.c
index 070dc47..41ca887 100644
--- a/drivers/clk/clk-gate.c
+++ b/drivers/clk/clk-gate.c
@@ -123,6 +123,11 @@ const struct clk_ops clk_gate_ops = {
 };
 EXPORT_SYMBOL_GPL(clk_gate_ops);
 
+const struct clk_ops clk_gate_ro_ops = {
+	.is_enabled = clk_gate_is_enabled,
+};
+EXPORT_SYMBOL_GPL(clk_gate_ro_ops);
+
 struct clk_hw *__clk_hw_register_gate(struct device *dev,
 		struct device_node *np, const char *name,
 		const char *parent_name, const struct clk_hw *parent_hw,
diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h
index 94a78b3..6668d2d 100644
--- a/include/linux/clk-provider.h
+++ b/include/linux/clk-provider.h
@@ -485,6 +485,7 @@ struct clk_gate {
 #define CLK_GATE_BIG_ENDIAN		BIT(2)
 
 extern const struct clk_ops clk_gate_ops;
+extern const struct clk_ops clk_gate_ro_ops;
 struct clk_hw *__clk_hw_register_gate(struct device *dev,
 		struct device_node *np, const char *name,
 		const char *parent_name, const struct clk_hw *parent_hw,
-- 
2.7.4