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Date: Mon, 12 Mar 2018 14:10:12 +0000
From: Lee Jones <lee.jones@...aro.org>
To: Daniel Schultz <d.schultz@...tec.de>
Cc: zyw@...k-chips.com, zhangqing@...k-chips.com,
chenjh@...k-chips.com, linux-kernel@...r.kernel.org,
w.egorov@...tec.de
Subject: Re: [PATCH v2 2/2] mfd: rk808: Add restart functionality
Rockchip guys,
I'd really appreciate your input on these two patches please.
Please provide Reviewed-by/Tested-by tags.
On Wed, 07 Mar 2018, Daniel Schultz wrote:
> When using Rockchip SoCs with rk805/808/818 PMICs, restarts are realized by
> setting the reset registers in the "Clock and Reset Unit".
>
> Since all three shutdown functions have almost the same code, all logic
> from the shutdown functions can be refactored to a new function
> "rk808_update_bits", which can update a register by a given address and
> bitmask.
>
> After that, notifier blocks and the restart functions were added to the
> driver. Like the shutdown function, the restart is bound to the
> "rockchip,system-power-controller" device tree property and can easily
> revoked to the software restart by removing the property.
>
> Signed-off-by: Daniel Schultz <d.schultz@...tec.de>
> ---
> Changes:
> v2: Re-submit with recipients from Rockchip.
>
> drivers/mfd/rk808.c | 97 ++++++++++++++++++++++++++++++-----------------
> include/linux/mfd/rk808.h | 1 +
> 2 files changed, 63 insertions(+), 35 deletions(-)
>
> diff --git a/drivers/mfd/rk808.c b/drivers/mfd/rk808.c
> index d138721..2c68f8c 100644
> --- a/drivers/mfd/rk808.c
> +++ b/drivers/mfd/rk808.c
> @@ -27,6 +27,7 @@
> #include <linux/module.h>
> #include <linux/of_device.h>
> #include <linux/regmap.h>
> +#include <linux/reboot.h>
>
> struct rk808_reg_data {
> int addr;
> @@ -369,59 +370,73 @@ static const struct regmap_irq_chip rk818_irq_chip = {
>
> static struct i2c_client *rk808_i2c_client;
>
> -static void rk805_device_shutdown(void)
> +static void rk808_update_bits(unsigned int reg, unsigned int bit_mask)
> {
> int ret;
> struct rk808 *rk808 = i2c_get_clientdata(rk808_i2c_client);
>
> if (!rk808) {
> dev_warn(&rk808_i2c_client->dev,
> - "have no rk805, so do nothing here\n");
> + "have no %s, so do nothing here\n",
> + rk808->regmap_irq_chip->name);
> return;
> }
>
> ret = regmap_update_bits(rk808->regmap,
> - RK805_DEV_CTRL_REG,
> - DEV_OFF, DEV_OFF);
> + reg,
> + bit_mask, bit_mask);
> if (ret)
> - dev_err(&rk808_i2c_client->dev, "power off error!\n");
> + dev_err(&rk808_i2c_client->dev, "can't write to DEVCTRL: %x!\n",
> + ret);
> }
>
> -static void rk808_device_shutdown(void)
> +static void rk805_device_shutdown(void)
> {
> - int ret;
> - struct rk808 *rk808 = i2c_get_clientdata(rk808_i2c_client);
> -
> - if (!rk808) {
> - dev_warn(&rk808_i2c_client->dev,
> - "have no rk808, so do nothing here\n");
> - return;
> - }
> + rk808_update_bits(RK805_DEV_CTRL_REG, DEV_OFF);
> +}
> +static int rk805_restart_notify(struct notifier_block *this,
> + unsigned long mode, void *cmd)
> +{
> + rk808_update_bits(RK805_DEV_CTRL_REG, DEV_OFF_RST);
> + return NOTIFY_DONE;
> +}
>
> - ret = regmap_update_bits(rk808->regmap,
> - RK808_DEVCTRL_REG,
> - DEV_OFF_RST, DEV_OFF_RST);
> - if (ret)
> - dev_err(&rk808_i2c_client->dev, "power off error!\n");
> +static void rk808_device_shutdown(void)
> +{
> + rk808_update_bits(RK808_DEVCTRL_REG, DEV_OFF_RST);
> +}
> +static int rk808_restart_notify(struct notifier_block *this,
> + unsigned long mode, void *cmd)
> +{
> + rk808_update_bits(RK808_DEVCTRL_REG, DEV_OFF);
> + return NOTIFY_DONE;
> }
>
> static void rk818_device_shutdown(void)
> {
> - int ret;
> - struct rk808 *rk808 = i2c_get_clientdata(rk808_i2c_client);
> + rk808_update_bits(RK818_DEVCTRL_REG, DEV_OFF_RST);
> +}
> +static int rk818_restart_notify(struct notifier_block *this,
> + unsigned long mode, void *cmd)
> +{
> + rk808_update_bits(RK818_DEVCTRL_REG, DEV_OFF);
> + return NOTIFY_DONE;
> +}
>
> - if (!rk808) {
> - dev_warn(&rk808_i2c_client->dev,
> - "have no rk818, so do nothing here\n");
> - return;
> - }
> +static struct notifier_block rk805_restart_handler = {
> + .notifier_call = rk805_restart_notify,
> + .priority = 196,
> +};
>
> - ret = regmap_update_bits(rk808->regmap,
> - RK818_DEVCTRL_REG,
> - DEV_OFF_RST, DEV_OFF_RST);
> - if (ret)
> - dev_err(&rk808_i2c_client->dev, "power off error!\n");
> -}
> +static struct notifier_block rk808_restart_handler = {
> + .notifier_call = rk808_restart_notify,
> + .priority = 196,
> +};
> +
> +static struct notifier_block rk818_restart_handler = {
> + .notifier_call = rk818_restart_notify,
> + .priority = 196,
> +};
>
> static const struct of_device_id rk808_of_match[] = {
> { .compatible = "rockchip,rk805" },
> @@ -476,6 +491,7 @@ static int rk808_probe(struct i2c_client *client,
> cells = rk805s;
> nr_cells = ARRAY_SIZE(rk805s);
> pm_pwroff_fn = rk805_device_shutdown;
> + rk808->nb = &rk805_restart_handler;
> break;
> case RK808_ID:
> rk808->regmap_cfg = &rk808_regmap_config;
> @@ -485,6 +501,7 @@ static int rk808_probe(struct i2c_client *client,
> cells = rk808s;
> nr_cells = ARRAY_SIZE(rk808s);
> pm_pwroff_fn = rk808_device_shutdown;
> + rk808->nb = &rk808_restart_handler;
> break;
> case RK818_ID:
> rk808->regmap_cfg = &rk818_regmap_config;
> @@ -494,6 +511,7 @@ static int rk808_probe(struct i2c_client *client,
> cells = rk818s;
> nr_cells = ARRAY_SIZE(rk818s);
> pm_pwroff_fn = rk818_device_shutdown;
> + rk808->nb = &rk818_restart_handler;
> break;
> default:
> dev_err(&client->dev, "Unsupported RK8XX ID %lu\n",
> @@ -546,11 +564,18 @@ static int rk808_probe(struct i2c_client *client,
>
> pm_off = of_property_read_bool(np,
> "rockchip,system-power-controller");
> - if (pm_off && !pm_power_off) {
> + if (pm_off) {
> rk808_i2c_client = client;
> - pm_power_off = pm_pwroff_fn;
> + if (!pm_power_off)
> + pm_power_off = pm_pwroff_fn;
> + if (rk808->nb) {
> + ret = register_restart_handler(rk808->nb);
> + if (ret)
> + dev_err(&client->dev,
> + "cannot register restart handler, %d\n",
> + ret);
> + }
> }
> -
> return 0;
>
> err_irq:
> @@ -564,6 +589,8 @@ static int rk808_remove(struct i2c_client *client)
>
> regmap_del_irq_chip(client->irq, rk808->irq_data);
> pm_power_off = NULL;
> + if (rk808->nb)
> + unregister_restart_handler(rk808->nb);
>
> return 0;
> }
> diff --git a/include/linux/mfd/rk808.h b/include/linux/mfd/rk808.h
> index 338e0f6..9c26ca2 100644
> --- a/include/linux/mfd/rk808.h
> +++ b/include/linux/mfd/rk808.h
> @@ -453,5 +453,6 @@ struct rk808 {
> long variant;
> const struct regmap_config *regmap_cfg;
> const struct regmap_irq_chip *regmap_irq_chip;
> + struct notifier_block *nb;
> };
> #endif /* __LINUX_REGULATOR_RK808_H */
--
Lee Jones [李琼斯]
Linaro Services Technical Lead
Linaro.org │ Open source software for ARM SoCs
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