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Date: Wed, 13 May 2015 13:21:17 +0100 From: Lee Jones <lee.jones@...aro.org> To: Charles Keepax <ckeepax@...nsource.wolfsonmicro.com> Cc: broonie@...nel.org, lgirdwood@...il.com, sameo@...ux.intel.com, patches@...nsource.wolfsonmicro.com, linux-kernel@...r.kernel.org Subject: Re: [RESEND PATCH v3 05/10] mfd: arizona: Factor out SYSCLK enable from wm5102 hardware patch On Mon, 11 May 2015, Charles Keepax wrote: > wm5102 applies a custom hardware boot sequence, for this the SYSCLK > needs to be enabled. This patch factors out the code that enables > SYSCLK for this sequence such that it can be used for other boot time > operations that require SYSCLK. > > Signed-off-by: Charles Keepax <ckeepax@...nsource.wolfsonmicro.com> > Acked-by: Lee Jones <lee.jones@...aro.org> > --- > drivers/mfd/arizona-core.c | 77 ++++++++++++++++++++++++++++++++----------- > 1 files changed, 57 insertions(+), 20 deletions(-) Applied, thanks. > diff --git a/drivers/mfd/arizona-core.c b/drivers/mfd/arizona-core.c > index 326a4af..b5a7e0e 100644 > --- a/drivers/mfd/arizona-core.c > +++ b/drivers/mfd/arizona-core.c > @@ -264,19 +264,25 @@ static void arizona_disable_reset(struct arizona *arizona) > } > } > > -static int wm5102_apply_hardware_patch(struct arizona *arizona) > +struct arizona_sysclk_state { > + unsigned int fll; > + unsigned int sysclk; > +}; > + > +static int arizona_enable_freerun_sysclk(struct arizona *arizona, > + struct arizona_sysclk_state *state) > { > - unsigned int fll, sysclk; > int ret, err; > > /* Cache existing FLL and SYSCLK settings */ > - ret = regmap_read(arizona->regmap, ARIZONA_FLL1_CONTROL_1, &fll); > + ret = regmap_read(arizona->regmap, ARIZONA_FLL1_CONTROL_1, &state->fll); > if (ret) { > dev_err(arizona->dev, "Failed to cache FLL settings: %d\n", > ret); > return ret; > } > - ret = regmap_read(arizona->regmap, ARIZONA_SYSTEM_CLOCK_1, &sysclk); > + ret = regmap_read(arizona->regmap, ARIZONA_SYSTEM_CLOCK_1, > + &state->sysclk); > if (ret) { > dev_err(arizona->dev, "Failed to cache SYSCLK settings: %d\n", > ret); > @@ -306,14 +312,58 @@ static int wm5102_apply_hardware_patch(struct arizona *arizona) > goto err_fll; > } > > + return 0; > + > +err_fll: > + err = regmap_write(arizona->regmap, ARIZONA_FLL1_CONTROL_1, state->fll); > + if (err) > + dev_err(arizona->dev, > + "Failed to re-apply old FLL settings: %d\n", err); > + > + return ret; > +} > + > +static int arizona_disable_freerun_sysclk(struct arizona *arizona, > + struct arizona_sysclk_state *state) > +{ > + int ret; > + > + ret = regmap_write(arizona->regmap, ARIZONA_SYSTEM_CLOCK_1, > + state->sysclk); > + if (ret) { > + dev_err(arizona->dev, > + "Failed to re-apply old SYSCLK settings: %d\n", ret); > + return ret; > + } > + > + ret = regmap_write(arizona->regmap, ARIZONA_FLL1_CONTROL_1, state->fll); > + if (ret) { > + dev_err(arizona->dev, > + "Failed to re-apply old FLL settings: %d\n", ret); > + return ret; > + } > + > + return 0; > +} > + > +static int wm5102_apply_hardware_patch(struct arizona *arizona) > +{ > + struct arizona_sysclk_state state; > + int err, ret; > + > + ret = arizona_enable_freerun_sysclk(arizona, &state); > + if (ret) > + return ret; > + > /* Start the write sequencer and wait for it to finish */ > ret = regmap_write(arizona->regmap, ARIZONA_WRITE_SEQUENCER_CTRL_0, > ARIZONA_WSEQ_ENA | ARIZONA_WSEQ_START | 160); > if (ret) { > dev_err(arizona->dev, "Failed to start write sequencer: %d\n", > ret); > - goto err_sysclk; > + goto err; > } > + > ret = arizona_poll_reg(arizona, 5, ARIZONA_WRITE_SEQUENCER_CTRL_1, > ARIZONA_WSEQ_BUSY, 0); > if (ret) { > @@ -322,21 +372,8 @@ static int wm5102_apply_hardware_patch(struct arizona *arizona) > ret = -ETIMEDOUT; > } > > -err_sysclk: > - err = regmap_write(arizona->regmap, ARIZONA_SYSTEM_CLOCK_1, sysclk); > - if (err) { > - dev_err(arizona->dev, > - "Failed to re-apply old SYSCLK settings: %d\n", > - err); > - } > - > -err_fll: > - err = regmap_write(arizona->regmap, ARIZONA_FLL1_CONTROL_1, fll); > - if (err) { > - dev_err(arizona->dev, > - "Failed to re-apply old FLL settings: %d\n", > - err); > - } > +err: > + err = arizona_disable_freerun_sysclk(arizona, &state); > > return ret ?: err; > } -- Lee Jones Linaro STMicroelectronics Landing Team Lead Linaro.org │ Open source software for ARM SoCs Follow Linaro: Facebook | Twitter | Blog -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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