linux-kernel - Re: [PATCH 1/2] mfd: axp20x: Add address extension registers for AXP806 regmap

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Message-ID: <20161118184758.GH19884@dell.home>
Date:   Fri, 18 Nov 2016 18:47:58 +0000
From:   Lee Jones <lee.jones@...aro.org>
To:     Chen-Yu Tsai <wens@...e.org>
Cc:     linux-kernel@...r.kernel.org, linux-sunxi@...glegroups.com,
        Maxime Ripard <maxime.ripard@...e-electrons.com>,
        Hans de Goede <hdegoede@...hat.com>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 1/2] mfd: axp20x: Add address extension registers for
 AXP806 regmap

On Fri, 11 Nov 2016, Chen-Yu Tsai wrote:

> The AXP806 supports either master/standalone or slave mode.
> Slave mode allows sharing the serial bus, even with multiple
> AXP806 which all have the same hardware address.
> 
> This is done with extra "serial interface address extension",
> or AXP806_BUS_ADDR_EXT, and "register address extension", or
> AXP806_REG_ADDR_EXT, registers. The former is read-only, with
> 1 bit customizable at the factory, and 1 bit depending on the
> state of an external pin. The latter is writable. Only when
> the these device addressing bits (in the upper 4 bits of the
> registers) match, will the device respond to operations on
> its other registers.
> 
> Add these 2 registers to the regmap so we can access them.
> 
> Signed-off-by: Chen-Yu Tsai <wens@...e.org>
> ---
>  drivers/mfd/axp20x.c       | 3 ++-
>  include/linux/mfd/axp20x.h | 2 ++
>  2 files changed, 4 insertions(+), 1 deletion(-)

Applied, thanks.

> diff --git a/drivers/mfd/axp20x.c b/drivers/mfd/axp20x.c
> index ba130be32e61..cdaeb34a9a38 100644
> --- a/drivers/mfd/axp20x.c
> +++ b/drivers/mfd/axp20x.c
> @@ -135,6 +135,7 @@ static const struct regmap_range axp806_writeable_ranges[] = {
>  	regmap_reg_range(AXP806_PWR_OUT_CTRL1, AXP806_CLDO3_V_CTRL),
>  	regmap_reg_range(AXP20X_IRQ1_EN, AXP20X_IRQ2_EN),
>  	regmap_reg_range(AXP20X_IRQ1_STATE, AXP20X_IRQ2_STATE),
> +	regmap_reg_range(AXP806_REG_ADDR_EXT, AXP806_REG_ADDR_EXT),
>  };
>  
>  static const struct regmap_range axp806_volatile_ranges[] = {
> @@ -305,7 +306,7 @@ static const struct regmap_config axp806_regmap_config = {
>  	.val_bits	= 8,
>  	.wr_table	= &axp806_writeable_table,
>  	.volatile_table	= &axp806_volatile_table,
> -	.max_register	= AXP806_VREF_TEMP_WARN_L,
> +	.max_register	= AXP806_REG_ADDR_EXT,
>  	.cache_type	= REGCACHE_RBTREE,
>  };
>  
> diff --git a/include/linux/mfd/axp20x.h b/include/linux/mfd/axp20x.h
> index fec597fb34cb..7e85ececcedf 100644
> --- a/include/linux/mfd/axp20x.h
> +++ b/include/linux/mfd/axp20x.h
> @@ -115,6 +115,8 @@ enum {
>  #define AXP806_CLDO2_V_CTRL		0x25
>  #define AXP806_CLDO3_V_CTRL		0x26
>  #define AXP806_VREF_TEMP_WARN_L		0xf3
> +#define AXP806_BUS_ADDR_EXT		0xfe
> +#define AXP806_REG_ADDR_EXT		0xff
>  
>  /* Interrupt */
>  #define AXP152_IRQ1_EN			0x40

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