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Date: Thu, 16 Jun 2016 16:16:58 +0100
From: Lee Jones <lee.jones@...aro.org>
To: Peter Ujfalusi <peter.ujfalusi@...com>
Cc: linux-omap@...r.kernel.org, linux-kernel@...r.kernel.org,
tony@...mide.com, devicetree@...r.kernel.org
Subject: Re: [PATCH] mfd: twl6040: Handle mclk used for HPPLL and optional
internal clock source
On Wed, 11 May 2016, Peter Ujfalusi wrote:
> On some boards, like omap5-uevm the MCLK is gated by default and in order
> to be able to use the High performance modes of twl6040 it need to be
> enabled by SW.
> Add support for handling the MCLK source clock via CCF.
> At the same time lover the print priority of the notification that the 32K
Mr Lover Lover!
> clock is not proveded so it is not going to be handled by the driver.
>
> Signed-off-by: Peter Ujfalusi <peter.ujfalusi@...com>
> ---
> Documentation/devicetree/bindings/mfd/twl6040.txt | 4 +--
> drivers/mfd/twl6040.c | 34 +++++++++++++++++------
> include/linux/mfd/twl6040.h | 3 +-
> 3 files changed, 29 insertions(+), 12 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/mfd/twl6040.txt b/Documentation/devicetree/bindings/mfd/twl6040.txt
> index a41157b5d930..e6afdfa3543d 100644
> --- a/Documentation/devicetree/bindings/mfd/twl6040.txt
> +++ b/Documentation/devicetree/bindings/mfd/twl6040.txt
> @@ -19,8 +19,8 @@ Required properties:
>
> Optional properties, nodes:
> - enable-active-high: To power on the twl6040 during boot.
> -- clocks: phandle to the clk32k clock provider
> -- clock-names: Must be "clk32k"
> +- clocks: phandle to the clk32k and/or to mclk clock provider
> +- clock-names: Must be "clk32k" for the 32K clock and "mclk" for the MCLK.
>
> Vibra functionality
> Required properties:
> diff --git a/drivers/mfd/twl6040.c b/drivers/mfd/twl6040.c
> index 852d5874aabb..f3dcf3a85e84 100644
> --- a/drivers/mfd/twl6040.c
> +++ b/drivers/mfd/twl6040.c
> @@ -291,7 +291,7 @@ int twl6040_power(struct twl6040 *twl6040, int on)
> if (twl6040->power_count++)
> goto out;
>
> - ret = clk_prepare_enable(twl6040->clk32k);
> + ret = clk_prepare_enable(twl6040->clk32k_clk);
> if (ret) {
> twl6040->power_count = 0;
> goto out;
> @@ -304,7 +304,7 @@ int twl6040_power(struct twl6040 *twl6040, int on)
> /* use automatic power-up sequence */
> ret = twl6040_power_up_automatic(twl6040);
> if (ret) {
> - clk_disable_unprepare(twl6040->clk32k);
> + clk_disable_unprepare(twl6040->clk32k_clk);
> twl6040->power_count = 0;
> goto out;
> }
> @@ -312,7 +312,7 @@ int twl6040_power(struct twl6040 *twl6040, int on)
> /* use manual power-up sequence */
> ret = twl6040_power_up_manual(twl6040);
> if (ret) {
> - clk_disable_unprepare(twl6040->clk32k);
> + clk_disable_unprepare(twl6040->clk32k_clk);
> twl6040->power_count = 0;
> goto out;
> }
> @@ -355,7 +355,10 @@ int twl6040_power(struct twl6040 *twl6040, int on)
> twl6040->sysclk = 0;
> twl6040->mclk = 0;
>
> - clk_disable_unprepare(twl6040->clk32k);
> + if (twl6040->pll == TWL6040_SYSCLK_SEL_HPPLL)
> + clk_disable_unprepare(twl6040->mclk_clk);
> +
> + clk_disable_unprepare(twl6040->clk32k_clk);
> }
>
> out:
> @@ -427,6 +430,8 @@ int twl6040_set_pll(struct twl6040 *twl6040, int pll_id,
> ret = -EINVAL;
> goto pll_out;
> }
> +
> + clk_disable_unprepare(twl6040->mclk_clk);
> break;
> case TWL6040_SYSCLK_SEL_HPPLL:
> /* high-performance PLL can provide only 19.2 MHz */
> @@ -468,6 +473,9 @@ int twl6040_set_pll(struct twl6040 *twl6040, int pll_id,
> goto pll_out;
> }
>
> + /* When switching to HPPLL, enable the mclk first */
> + if (pll_id != twl6040->pll)
> + clk_prepare_enable(twl6040->mclk_clk);
> /*
> * enable clock slicer to ensure input waveform is
> * square
> @@ -651,12 +659,20 @@ static int twl6040_probe(struct i2c_client *client,
>
> i2c_set_clientdata(client, twl6040);
>
> - twl6040->clk32k = devm_clk_get(&client->dev, "clk32k");
> - if (IS_ERR(twl6040->clk32k)) {
> - if (PTR_ERR(twl6040->clk32k) == -EPROBE_DEFER)
> + twl6040->clk32k_clk = devm_clk_get(&client->dev, "clk32k");
> + if (IS_ERR(twl6040->clk32k_clk)) {
> + if (PTR_ERR(twl6040->clk32k_clk) == -EPROBE_DEFER)
> + return -EPROBE_DEFER;
> + dev_dbg(&client->dev, "clk32k is not handled\n");
> + twl6040->clk32k_clk = NULL;
> + }
> +
> + twl6040->mclk_clk = devm_clk_get(&client->dev, "mclk");
> + if (IS_ERR(twl6040->mclk_clk)) {
> + if (PTR_ERR(twl6040->mclk_clk) == -EPROBE_DEFER)
> return -EPROBE_DEFER;
> - dev_info(&client->dev, "clk32k is not handled\n");
> - twl6040->clk32k = NULL;
> + dev_dbg(&client->dev, "mclk is not handled\n");
> + twl6040->mclk_clk = NULL;
> }
>
> twl6040->supplies[0].supply = "vio";
> diff --git a/include/linux/mfd/twl6040.h b/include/linux/mfd/twl6040.h
> index 8f9fc3d26e6d..a7c50e54f3e0 100644
> --- a/include/linux/mfd/twl6040.h
> +++ b/include/linux/mfd/twl6040.h
> @@ -224,7 +224,8 @@ struct twl6040 {
> struct regmap *regmap;
> struct regmap_irq_chip_data *irq_data;
> struct regulator_bulk_data supplies[2]; /* supplies for vio, v2v1 */
> - struct clk *clk32k;
> + struct clk *clk32k_clk;
> + struct clk *mclk_clk;
Not sure I get the naming here.
What's wrong with clk32k and mclk?
> struct mutex mutex;
> struct mutex irq_mutex;
> struct mfd_cell cells[TWL6040_CELLS];
--
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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