mfd: axp20x: Fix AXP806 access errors on cold boot (696f0b3f) · Commits · 戴 / test

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. The AXP806_REG_ADDR_EXT was previously configured by Allwinner's bootloader. Work on U-boot SPL support now allows us to switch to mainline U-boot, which doesn't do this for us. There might be other bare minimum bootloaders out there which don't to this either. It's best to handle this in the kernel. This patch sets AXP806_REG_ADDR_EXT to 0x10, which is what we know to be the proper value for a standard AXP806 in slave mode. Afterwards it will reinitialize the regmap cache, to purge any invalid stale values. Signed-off-by:

Chen-Yu Tsai <wens@csie.org> Signed-off-by:

Lee Jones <lee.jones@linaro.org>

drivers/mfd/axp20x.c

+26 −0

Original line number	Diff line number	Diff line
		@@ -31,6 +31,8 @@

		#define AXP20X_OFF 0x80

		#define AXP806_REG_ADDR_EXT_ADDR_SLAVE_MODE BIT(4)

		static const char * const axp20x_model_names[] = {
		"AXP152",
		"AXP202",
		@@ -861,6 +863,30 @@ int axp20x_device_probe(struct axp20x_dev *axp20x)
		{
		int ret;

		/*
		* 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. The device
		* will only respond to operations to its other registers when
		* the these device addressing bits (in the upper 4 bits of the
		* registers) match.
		*
		* Since we only support an AXP806 chained to an AXP809 in slave
		* mode, and there isn't any existing hardware which uses AXP806
		* in master mode, or has 2 AXP806s in the same system, we can
		* just program the register address extension to the slave mode
		* address.
		*/
		if (axp20x->variant == AXP806_ID)
		regmap_write(axp20x->regmap, AXP806_REG_ADDR_EXT,
		AXP806_REG_ADDR_EXT_ADDR_SLAVE_MODE);

		ret = regmap_add_irq_chip(axp20x->regmap, axp20x->irq,
		IRQF_ONESHOT \| IRQF_SHARED \| axp20x->irq_flags,
		-1, axp20x->regmap_irq_chip, &axp20x->regmap_irqc);

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