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Date: Sun, 20 Sep 2015 05:17:47 +0100
From: Lee Jones <lee.jones@...aro.org>
To: Krzysztof Kozlowski <k.kozlowski.k@...il.com>
Cc: Sangbeom Kim <sbkim73@...sung.com>,
Krzysztof Kozlowski <k.kozlowski@...sung.com>,
Samuel Ortiz <sameo@...ux.intel.com>,
linux-kernel@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
Anand Moon <linux.amoon@...il.com>,
Javier Martinez Canillas <javier@....samsung.com>,
Kukjin Kim <kgene@...nel.org>
Subject: Re: [RESEND v2] mfd: s2mps11: Add manual shutdown method for Odroid
XU3
On Mon, 14 Sep 2015, Krzysztof Kozlowski wrote:
> On Odroid XU3 board (with S2MPS11 PMIC) the PWRHOLD bit in CTRL1
> register must be manually set to 0 before initiating power off sequence.
>
> One of usual power down methods for Exynos based devices looks like:
> 1. PWRHOLD pin of PMIC is connected to PSHOLD of Exynos SoC.
> 2. Exynos holds up this pin during system operation.
> 3. ACOKB pin of PMIC is pulled up to VBATT and optionally to pin in
> other device.
> 4. When PWRHOLD/PSHOLD goes low, the PMIC will turn off the power if
> ACOKB goes high.
>
> On Odroid XU3 family the difference is in (3) - the ACOKB is grounded.
> This means that PMIC must manually set PWRHOLD field to low and then
> wait for signal from Application Processor (the usual change in
> PWRHOLD/PSHOLD pin will actually cut off the power).
>
> The patch adds respective binding allowing Odroid XU3 device to be
> powered off.
>
> Signed-off-by: Krzysztof Kozlowski <k.kozlowski.k@...il.com>
> Reported-by: Anand Moon <linux.amoon@...il.com>
> Tested-by: Anand Moon <linux.amoon@...il.com>
> Reviewed-by: Javier Martinez Canillas <javier@....samsung.com>
> Acked-by: Lee Jones <lee.jones@...aro.org>
>
> ---
>
> The rest of patchset was applied by Kukjin Kim:
> - dt-bindings documentation:
> https://git.kernel.org/cgit/linux/kernel/git/kgene/linux-samsung.git/commit/?h=v4.3-next/dt-samsung-new-3&id=ff1020841cf0ff868d61d44169e7cc32f73599b8
> - DTS change:
> https://git.kernel.org/cgit/linux/kernel/git/kgene/linux-samsung.git/commit/?h=v4.3-next/dt-samsung-new-3&id=5bcbe4ba55bb0ad75c8495ee295bab036735483e
>
> Changes since v2:
> 1. Just rebase on current next.
>
> Changes since v1:
> 1. Split bindings documentation to separate patch (suggested by Lee).
> 2. Fix additional empty line (suggested by Lee).
> 3. Add Anand's tested-by, Javier's reviewed-by and Lee's acked-by.
>
> Patch is losely based on patch in Hardkernel repository and previous
> work of Anand Moon.
> ---
> drivers/mfd/sec-core.c | 30 ++++++++++++++++++++++++++++++
> include/linux/mfd/samsung/core.h | 2 ++
> include/linux/mfd/samsung/s2mps11.h | 1 +
> 3 files changed, 33 insertions(+)
Applied, thanks.
> diff --git a/drivers/mfd/sec-core.c b/drivers/mfd/sec-core.c
> index d206a3e8fe87..2d1137a7a0ee 100644
> --- a/drivers/mfd/sec-core.c
> +++ b/drivers/mfd/sec-core.c
> @@ -278,6 +278,8 @@ static struct sec_platform_data *sec_pmic_i2c_parse_dt_pdata(
> * not parsed here.
> */
>
> + pd->manual_poweroff = of_property_read_bool(dev->of_node,
> + "samsung,s2mps11-acokb-ground");
> return pd;
> }
> #else
> @@ -440,6 +442,33 @@ static int sec_pmic_remove(struct i2c_client *i2c)
> return 0;
> }
>
> +static void sec_pmic_shutdown(struct i2c_client *i2c)
> +{
> + struct sec_pmic_dev *sec_pmic = i2c_get_clientdata(i2c);
> + unsigned int reg, mask;
> +
> + if (!sec_pmic->pdata->manual_poweroff)
> + return;
> +
> + switch (sec_pmic->device_type) {
> + case S2MPS11X:
> + reg = S2MPS11_REG_CTRL1;
> + mask = S2MPS11_CTRL1_PWRHOLD_MASK;
> + break;
> + default:
> + /*
> + * Currently only one board with S2MPS11 needs this, so just
> + * ignore the rest.
> + */
> + dev_warn(sec_pmic->dev,
> + "Unsupported device %lu for manual power off\n",
> + sec_pmic->device_type);
> + return;
> + }
> +
> + regmap_update_bits(sec_pmic->regmap_pmic, reg, mask, 0);
> +}
> +
> #ifdef CONFIG_PM_SLEEP
> static int sec_pmic_suspend(struct device *dev)
> {
> @@ -491,6 +520,7 @@ static struct i2c_driver sec_pmic_driver = {
> },
> .probe = sec_pmic_probe,
> .remove = sec_pmic_remove,
> + .shutdown = sec_pmic_shutdown,
> .id_table = sec_pmic_id,
> };
>
> diff --git a/include/linux/mfd/samsung/core.h b/include/linux/mfd/samsung/core.h
> index 75115384f3fc..aa78957e092f 100644
> --- a/include/linux/mfd/samsung/core.h
> +++ b/include/linux/mfd/samsung/core.h
> @@ -132,6 +132,8 @@ struct sec_platform_data {
> int buck2_init;
> int buck3_init;
> int buck4_init;
> + /* Whether or not manually set PWRHOLD to low during shutdown. */
> + bool manual_poweroff;
> };
>
> /**
> diff --git a/include/linux/mfd/samsung/s2mps11.h b/include/linux/mfd/samsung/s2mps11.h
> index 7981a9d77d3f..b288965e8101 100644
> --- a/include/linux/mfd/samsung/s2mps11.h
> +++ b/include/linux/mfd/samsung/s2mps11.h
> @@ -179,6 +179,7 @@ enum s2mps11_regulators {
> #define S2MPS11_BUCK_N_VOLTAGES (S2MPS11_BUCK_VSEL_MASK + 1)
> #define S2MPS11_RAMP_DELAY 25000 /* uV/us */
>
> +#define S2MPS11_CTRL1_PWRHOLD_MASK BIT(4)
>
> #define S2MPS11_BUCK2_RAMP_SHIFT 6
> #define S2MPS11_BUCK34_RAMP_SHIFT 4
--
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog
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