28.06.2019 5:12, Sowjanya Komatineni пишет: > This patch adds support for Tegra pinctrl driver suspend and resume. > > During suspend, context of all pinctrl registers are stored and > on resume they are all restored to have all the pinmux and pad > configuration for normal operation. > > Acked-by: Thierry Reding <[email protected]> > Signed-off-by: Sowjanya Komatineni <[email protected]> > --- > drivers/pinctrl/tegra/pinctrl-tegra.c | 52 > ++++++++++++++++++++++++++++++++ > drivers/pinctrl/tegra/pinctrl-tegra.h | 3 ++ > drivers/pinctrl/tegra/pinctrl-tegra210.c | 1 + > 3 files changed, 56 insertions(+) > > diff --git a/drivers/pinctrl/tegra/pinctrl-tegra.c > b/drivers/pinctrl/tegra/pinctrl-tegra.c > index 34596b246578..e7c0a1011cba 100644 > --- a/drivers/pinctrl/tegra/pinctrl-tegra.c > +++ b/drivers/pinctrl/tegra/pinctrl-tegra.c > @@ -621,6 +621,43 @@ static void tegra_pinctrl_clear_parked_bits(struct > tegra_pmx *pmx) > } > } > > +static int tegra_pinctrl_suspend(struct device *dev) > +{ > + struct tegra_pmx *pmx = dev_get_drvdata(dev); > + u32 *backup_regs = pmx->backup_regs; > + u32 *regs; > + unsigned int i, j; > + > + for (i = 0; i < pmx->nbanks; i++) { > + regs = pmx->regs[i]; > + for (j = 0; j < pmx->reg_bank_size[i] / 4; j++) > + *backup_regs++ = readl(regs++); > + } > + > + return pinctrl_force_sleep(pmx->pctl); > +} > + > +static int tegra_pinctrl_resume(struct device *dev) > +{ > + struct tegra_pmx *pmx = dev_get_drvdata(dev); > + u32 *backup_regs = pmx->backup_regs; > + u32 *regs; > + unsigned int i, j; > + > + for (i = 0; i < pmx->nbanks; i++) { > + regs = pmx->regs[i]; > + for (j = 0; j < pmx->reg_bank_size[i] / 4; j++) > + writel(*backup_regs++, regs++); > + } > + > + return 0; > +} > + > +const struct dev_pm_ops tegra_pinctrl_pm = { > + .suspend = &tegra_pinctrl_suspend, > + .resume = &tegra_pinctrl_resume > +};
Hm, so this are the generic platform-driver suspend-resume OPS here, which is very nice! But.. shouldn't pinctrl be resumed before the CLK driver (which is syscore_ops in this version of the series)? .. Given that "clock" function may need to be selected for some of the pins.
