linux-kernel - [PATCH v4 5/6] pwm: meson: don't carry internal clock elements around

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20231222111658.832167-6-jbrunet@baylibre.com>
Date: Fri, 22 Dec 2023 12:16:53 +0100
From: Jerome Brunet <jbrunet@...libre.com>
To: Thierry Reding <thierry.reding@...il.com>,
	Uwe Kleine-König <u.kleine-koenig@...gutronix.de>,
	Neil Armstrong <neil.armstrong@...aro.org>,
	Rob Herring <robh+dt@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>
Cc: Jerome Brunet <jbrunet@...libre.com>,
	Kevin Hilman <khilman@...libre.com>,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-amlogic@...ts.infradead.org,
	linux-pwm@...r.kernel.org,
	JunYi Zhao <junyi.zhao@...ogic.com>
Subject: [PATCH v4 5/6] pwm: meson: don't carry internal clock elements around

Pointers to the internal clock elements of the PWM are useless
after probe. There is no need to carry this around in the device
data. Just let devres deal with it.

Signed-off-by: Jerome Brunet <jbrunet@...libre.com>
---
 drivers/pwm/pwm-meson.c | 67 ++++++++++++++++++++++++-----------------
 1 file changed, 39 insertions(+), 28 deletions(-)

diff --git a/drivers/pwm/pwm-meson.c b/drivers/pwm/pwm-meson.c
index 15c44185d784..fb113bc8da29 100644
--- a/drivers/pwm/pwm-meson.c
+++ b/drivers/pwm/pwm-meson.c
@@ -90,9 +90,6 @@ struct meson_pwm_channel {
 	unsigned int hi;
 	unsigned int lo;
 
-	struct clk_mux mux;
-	struct clk_divider div;
-	struct clk_gate gate;
 	struct clk *clk;
 };
 
@@ -442,6 +439,13 @@ static int meson_pwm_init_channels(struct device *dev)
 		struct meson_pwm_channel *channel = &meson->channels[i];
 		struct clk_parent_data div_parent = {}, gate_parent = {};
 		struct clk_init_data init = {};
+		struct clk_divider *div;
+		struct clk_gate *gate;
+		struct clk_mux *mux;
+
+		mux = devm_kzalloc(dev, sizeof(*mux), GFP_KERNEL);
+		if (!mux)
+			return -ENOMEM;
 
 		snprintf(name, sizeof(name), "%s#mux%u", dev_name(dev), i);
 
@@ -451,63 +455,70 @@ static int meson_pwm_init_channels(struct device *dev)
 		init.parent_data = mux_parent_data;
 		init.num_parents = MESON_NUM_MUX_PARENTS;
 
-		channel->mux.reg = meson->base + REG_MISC_AB;
-		channel->mux.shift =
-				meson_pwm_per_channel_data[i].clk_sel_shift;
-		channel->mux.mask = MISC_CLK_SEL_MASK;
-		channel->mux.flags = 0;
-		channel->mux.lock = &meson->lock;
-		channel->mux.table = NULL;
-		channel->mux.hw.init = &init;
+		mux->reg = meson->base + REG_MISC_AB;
+		mux->shift = meson_pwm_per_channel_data[i].clk_sel_shift;
+		mux->mask = MISC_CLK_SEL_MASK;
+		mux->flags = 0;
+		mux->lock = &meson->lock;
+		mux->table = NULL;
+		mux->hw.init = &init;
 
-		err = devm_clk_hw_register(dev, &channel->mux.hw);
+		err = devm_clk_hw_register(dev, &mux->hw);
 		if (err)
 			return dev_err_probe(dev, err,
 					     "failed to register %s\n", name);
 
+		div = devm_kzalloc(dev, sizeof(*div), GFP_KERNEL);
+		if (!div)
+			return -ENOMEM;
+
 		snprintf(name, sizeof(name), "%s#div%u", dev_name(dev), i);
 
 		init.name = name;
 		init.ops = &clk_divider_ops;
 		init.flags = CLK_SET_RATE_PARENT;
 		div_parent.index = -1;
-		div_parent.hw = &channel->mux.hw;
+		div_parent.hw = &mux->hw;
 		init.parent_data = &div_parent;
 		init.num_parents = 1;
 
-		channel->div.reg = meson->base + REG_MISC_AB;
-		channel->div.shift = meson_pwm_per_channel_data[i].clk_div_shift;
-		channel->div.width = MISC_CLK_DIV_WIDTH;
-		channel->div.hw.init = &init;
-		channel->div.flags = 0;
-		channel->div.lock = &meson->lock;
+		div->reg = meson->base + REG_MISC_AB;
+		div->shift = meson_pwm_per_channel_data[i].clk_div_shift;
+		div->width = MISC_CLK_DIV_WIDTH;
+		div->hw.init = &init;
+		div->flags = 0;
+		div->lock = &meson->lock;
 
-		err = devm_clk_hw_register(dev, &channel->div.hw);
+		err = devm_clk_hw_register(dev, &div->hw);
 		if (err)
 			return dev_err_probe(dev, err,
 					     "failed to register %s\n", name);
 
+		gate = devm_kzalloc(dev, sizeof(*gate), GFP_KERNEL);
+		if (!gate)
+			return -ENOMEM;
+
 		snprintf(name, sizeof(name), "%s#gate%u", dev_name(dev), i);
 
 		init.name = name;
 		init.ops = &clk_gate_ops;
 		init.flags = CLK_SET_RATE_PARENT | CLK_IGNORE_UNUSED;
 		gate_parent.index = -1;
-		gate_parent.hw = &channel->div.hw;
+		gate_parent.hw = &div->hw;
 		init.parent_data = &gate_parent;
 		init.num_parents = 1;
 
-		channel->gate.reg = meson->base + REG_MISC_AB;
-		channel->gate.bit_idx = meson_pwm_per_channel_data[i].clk_en_shift;
-		channel->gate.hw.init = &init;
-		channel->gate.flags = 0;
-		channel->gate.lock = &meson->lock;
+		gate->reg = meson->base + REG_MISC_AB;
+		gate->bit_idx = meson_pwm_per_channel_data[i].clk_en_shift;
+		gate->hw.init = &init;
+		gate->flags = 0;
+		gate->lock = &meson->lock;
 
-		err = devm_clk_hw_register(dev, &channel->gate.hw);
+		err = devm_clk_hw_register(dev, &gate->hw);
 		if (err)
 			return dev_err_probe(dev, err, "failed to register %s\n", name);
 
-		channel->clk = devm_clk_hw_get_clk(dev, &channel->gate.hw, NULL);
+		channel->clk = devm_clk_hw_get_clk(dev, &gate->hw, NULL);
 		if (IS_ERR(channel->clk))
 			return dev_err_probe(dev, PTR_ERR(channel->clk),
 					     "failed to register %s\n", name);
-- 
2.42.0