Re: [PATCH 4/6] mfd: stmpe: mask off unused blocks properly

From: Lee Jones
Date: Thu Apr 17 2014 - 06:52:31 EST


> The STMPE driver would just read/modify/write the system control
> register on the STMPE1601, meaning it would not properly mask off
> the PWM block, which remained active if it was on at boot time.
> This makes sure the blocks are always masked off if they were
> active on boot, saving some power. Also rename the inconsistenty
> named STMPE1601 define for the PWM block activation.
>
> Signed-off-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
> ---
> drivers/mfd/stmpe.c | 9 +++++++++
> drivers/mfd/stmpe.h | 2 +-
> 2 files changed, 10 insertions(+), 1 deletion(-)

Patch looks good to me.

Acked-by: Lee Jones <lee.jones@xxxxxxxxxx>

> diff --git a/drivers/mfd/stmpe.c b/drivers/mfd/stmpe.c
> index 692452442ead..065c923cb2a9 100644
> --- a/drivers/mfd/stmpe.c
> +++ b/drivers/mfd/stmpe.c
> @@ -606,9 +606,18 @@ static int stmpe1601_enable(struct stmpe *stmpe, unsigned int blocks,
>
> if (blocks & STMPE_BLOCK_GPIO)
> mask |= STMPE1601_SYS_CTRL_ENABLE_GPIO;
> + else
> + mask &= ~STMPE1601_SYS_CTRL_ENABLE_GPIO;
>
> if (blocks & STMPE_BLOCK_KEYPAD)
> mask |= STMPE1601_SYS_CTRL_ENABLE_KPC;
> + else
> + mask &= ~STMPE1601_SYS_CTRL_ENABLE_KPC;
> +
> + if (blocks & STMPE_BLOCK_PWM)
> + mask |= STMPE1601_SYS_CTRL_ENABLE_SPWM;
> + else
> + mask &= ~STMPE1601_SYS_CTRL_ENABLE_SPWM;
>
> return __stmpe_set_bits(stmpe, STMPE1601_REG_SYS_CTRL, mask,
> enable ? mask : 0);
> diff --git a/drivers/mfd/stmpe.h b/drivers/mfd/stmpe.h
> index 6639f1b0fef5..9e4d21d37a11 100644
> --- a/drivers/mfd/stmpe.h
> +++ b/drivers/mfd/stmpe.h
> @@ -192,7 +192,7 @@ int stmpe_remove(struct stmpe *stmpe);
>
> #define STMPE1601_SYS_CTRL_ENABLE_GPIO (1 << 3)
> #define STMPE1601_SYS_CTRL_ENABLE_KPC (1 << 1)
> -#define STMPE1601_SYSCON_ENABLE_SPWM (1 << 0)
> +#define STMPE1601_SYS_CTRL_ENABLE_SPWM (1 << 0)
>
> /* The 1601/2403 share the same masks */
> #define STMPE1601_AUTOSLEEP_TIMEOUT_MASK (0x7)

--
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org â Open source software for ARM SoCs
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