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clk: clk-gpio: add support for sleeping GPIOs in gpio-gate-clk
The current implementation of gpio-gate-clk enables/disables the clock using the GPIO in the ->enable() and ->disable() clock callbacks. This requires the GPIO to be configurable in atomic contexts. While it is the case for most memory-mapped GPIO controllers, it is not the case for GPIO expanders on I2C or SPI. This commit extends the gpio-gate-clk to check whether the GPIO calls require sleeping or not. If sleeping is not required, the current implementation based on ->enable()/->disable() is kept. However, if sleeping is needed, we instead implement the logic in the ->prepare() and ->unprepare() hooks. Thanks to this, a gate clock connected to a GPIO on a GPIO expander can be controlled with the existing driver. Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com> [sboyd@kernel.org: Mark clk ops static] Signed-off-by: Stephen Boyd <sboyd@kernel.org>
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@ -58,6 +58,35 @@ const struct clk_ops clk_gpio_gate_ops = {
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};
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EXPORT_SYMBOL_GPL(clk_gpio_gate_ops);
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static int clk_sleeping_gpio_gate_prepare(struct clk_hw *hw)
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{
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struct clk_gpio *clk = to_clk_gpio(hw);
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gpiod_set_value_cansleep(clk->gpiod, 1);
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return 0;
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}
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static void clk_sleeping_gpio_gate_unprepare(struct clk_hw *hw)
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{
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struct clk_gpio *clk = to_clk_gpio(hw);
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gpiod_set_value_cansleep(clk->gpiod, 0);
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}
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static int clk_sleeping_gpio_gate_is_prepared(struct clk_hw *hw)
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{
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struct clk_gpio *clk = to_clk_gpio(hw);
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return gpiod_get_value_cansleep(clk->gpiod);
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}
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static const struct clk_ops clk_sleeping_gpio_gate_ops = {
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.prepare = clk_sleeping_gpio_gate_prepare,
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.unprepare = clk_sleeping_gpio_gate_unprepare,
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.is_prepared = clk_sleeping_gpio_gate_is_prepared,
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};
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/**
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* DOC: basic clock multiplexer which can be controlled with a gpio output
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* Traits of this clock:
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@ -144,10 +173,16 @@ struct clk_hw *clk_hw_register_gpio_gate(struct device *dev, const char *name,
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const char *parent_name, struct gpio_desc *gpiod,
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unsigned long flags)
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{
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const struct clk_ops *ops;
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if (gpiod_cansleep(gpiod))
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ops = &clk_sleeping_gpio_gate_ops;
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else
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ops = &clk_gpio_gate_ops;
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return clk_register_gpio(dev, name,
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(parent_name ? &parent_name : NULL),
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(parent_name ? 1 : 0), gpiod, flags,
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&clk_gpio_gate_ops);
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(parent_name ? 1 : 0), gpiod, flags, ops);
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}
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EXPORT_SYMBOL_GPL(clk_hw_register_gpio_gate);
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