From mboxrd@z Thu Jan 1 00:00:00 1970 From: Lee Jones Subject: Re: [PATCH] mfd: twl6040: Handle mclk used for HPPLL and optional internal clock source Date: Thu, 16 Jun 2016 16:16:58 +0100 Message-ID: <20160616151658.GA21702@dell> References: <1462965209-6955-1-git-send-email-peter.ujfalusi@ti.com> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: Content-Disposition: inline In-Reply-To: <1462965209-6955-1-git-send-email-peter.ujfalusi@ti.com> Sender: linux-kernel-owner@vger.kernel.org To: Peter Ujfalusi Cc: linux-omap@vger.kernel.org, linux-kernel@vger.kernel.org, tony@atomide.com, devicetree@vger.kernel.org List-Id: devicetree@vger.kernel.org On Wed, 11 May 2016, Peter Ujfalusi wrote: > On some boards, like omap5-uevm the MCLK is gated by default and in o= rder > 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 th= e 32K Mr Lover Lover! > clock is not proveded so it is not going to be handled by the driver. >=20 > Signed-off-by: Peter Ujfalusi > --- > 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(-) >=20 > diff --git a/Documentation/devicetree/bindings/mfd/twl6040.txt b/Docu= mentation/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: > =20 > 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. > =20 > 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; > =20 > - ret =3D clk_prepare_enable(twl6040->clk32k); > + ret =3D clk_prepare_enable(twl6040->clk32k_clk); > if (ret) { > twl6040->power_count =3D 0; > goto out; > @@ -304,7 +304,7 @@ int twl6040_power(struct twl6040 *twl6040, int on= ) > /* use automatic power-up sequence */ > ret =3D twl6040_power_up_automatic(twl6040); > if (ret) { > - clk_disable_unprepare(twl6040->clk32k); > + clk_disable_unprepare(twl6040->clk32k_clk); > twl6040->power_count =3D 0; > goto out; > } > @@ -312,7 +312,7 @@ int twl6040_power(struct twl6040 *twl6040, int on= ) > /* use manual power-up sequence */ > ret =3D twl6040_power_up_manual(twl6040); > if (ret) { > - clk_disable_unprepare(twl6040->clk32k); > + clk_disable_unprepare(twl6040->clk32k_clk); > twl6040->power_count =3D 0; > goto out; > } > @@ -355,7 +355,10 @@ int twl6040_power(struct twl6040 *twl6040, int o= n) > twl6040->sysclk =3D 0; > twl6040->mclk =3D 0; > =20 > - clk_disable_unprepare(twl6040->clk32k); > + if (twl6040->pll =3D=3D TWL6040_SYSCLK_SEL_HPPLL) > + clk_disable_unprepare(twl6040->mclk_clk); > + > + clk_disable_unprepare(twl6040->clk32k_clk); > } > =20 > out: > @@ -427,6 +430,8 @@ int twl6040_set_pll(struct twl6040 *twl6040, int = pll_id, > ret =3D -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; > } > =20 > + /* When switching to HPPLL, enable the mclk first */ > + if (pll_id !=3D 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 *cli= ent, > =20 > i2c_set_clientdata(client, twl6040); > =20 > - twl6040->clk32k =3D devm_clk_get(&client->dev, "clk32k"); > - if (IS_ERR(twl6040->clk32k)) { > - if (PTR_ERR(twl6040->clk32k) =3D=3D -EPROBE_DEFER) > + twl6040->clk32k_clk =3D devm_clk_get(&client->dev, "clk32k"); > + if (IS_ERR(twl6040->clk32k_clk)) { > + if (PTR_ERR(twl6040->clk32k_clk) =3D=3D -EPROBE_DEFER) > + return -EPROBE_DEFER; > + dev_dbg(&client->dev, "clk32k is not handled\n"); > + twl6040->clk32k_clk =3D NULL; > + } > + > + twl6040->mclk_clk =3D devm_clk_get(&client->dev, "mclk"); > + if (IS_ERR(twl6040->mclk_clk)) { > + if (PTR_ERR(twl6040->mclk_clk) =3D=3D -EPROBE_DEFER) > return -EPROBE_DEFER; > - dev_info(&client->dev, "clk32k is not handled\n"); > - twl6040->clk32k =3D NULL; > + dev_dbg(&client->dev, "mclk is not handled\n"); > + twl6040->mclk_clk =3D NULL; > } > =20 > twl6040->supplies[0].supply =3D "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]; --=20 Lee Jones Linaro STMicroelectronics Landing Team Lead Linaro.org =E2=94=82 Open source software for ARM SoCs =46ollow Linaro: Facebook | Twitter | Blog