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Commit 294be03c authored by Romain Perier's avatar Romain Perier Committed by Wolfram Sang
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i2c: pxa: Add support for the I2C units found in Armada 3700 



The Armada 3700 has two I2C controllers that is compliant with the I2C
Bus Specificiation 2.1, supports multi-master and different bus speed:
Standard mode (up to 100 KHz), Fast mode (up to 400 KHz),
High speed mode (up to 3.4 Mhz).

This IP block has a lot of similarity with the PXA, except some register
offsets and bitfield. This commits adds a basic support for this I2C
unit.

Signed-off-by: default avatarRomain Perier <romain.perier@free-electrons.com>
Tested-by: default avatarGregory CLEMENT <gregory.clement@free-electrons.com>
Signed-off-by: default avatarWolfram Sang <wsa@the-dreams.de>
parent 6c14bdac

drivers/i2c/busses/Kconfig

+1 −1
Original line number Diff line number Diff line
@@ -763,7 +763,7 @@ config I2C_PUV3 


config I2C_PXA

	tristate "Intel PXA2XX I2C adapter"

	depends on ARCH_PXA || ARCH_MMP || (X86_32 && PCI && OF)

	depends on ARCH_PXA || ARCH_MMP || ARCH_MVEBU || (X86_32 && PCI && OF)

	help

	  If you have devices in the PXA I2C bus, say yes to this option.

	  This driver can also be built as a module.  If so, the module

drivers/i2c/busses/i2c-pxa.c

+15 −0
Original line number Diff line number Diff line
@@ -57,8 +57,12 @@ enum pxa_i2c_types { 
	REGS_PXA3XX,

	REGS_CE4100,

	REGS_PXA910,

	REGS_A3700,

};



#define ICR_BUSMODE_FM	(1 << 16)	   /* shifted fast mode for armada-3700 */

#define ICR_BUSMODE_HS	(1 << 17)	   /* shifted high speed mode for armada-3700 */



/*

 * I2C registers definitions

 */
@@ -93,6 +97,15 @@ static struct pxa_reg_layout pxa_reg_layout[] = { 
		.ilcr = 0x28,

		.iwcr = 0x30,

	},

	[REGS_A3700] = {

		.ibmr =	0x00,

		.idbr =	0x04,

		.icr =	0x08,

		.isr =	0x0c,

		.isar =	0x10,

		.fm = ICR_BUSMODE_FM,

		.hs = ICR_BUSMODE_HS,

	},

};



static const struct platform_device_id i2c_pxa_id_table[] = {
@@ -100,6 +113,7 @@ static const struct platform_device_id i2c_pxa_id_table[] = { 
	{ "pxa3xx-pwri2c",	REGS_PXA3XX },

	{ "ce4100-i2c",		REGS_CE4100 },

	{ "pxa910-i2c",		REGS_PXA910 },

	{ "armada-3700-i2c",	REGS_A3700  },

	{ },

};

MODULE_DEVICE_TABLE(platform, i2c_pxa_id_table);
@@ -1141,6 +1155,7 @@ static const struct of_device_id i2c_pxa_dt_ids[] = { 
	{ .compatible = "mrvl,pxa-i2c", .data = (void *)REGS_PXA2XX },

	{ .compatible = "mrvl,pwri2c", .data = (void *)REGS_PXA3XX },

	{ .compatible = "mrvl,mmp-twsi", .data = (void *)REGS_PXA910 },

	{ .compatible = "marvell,armada-3700-i2c", .data = (void *)REGS_A3700 },

	{}

};

MODULE_DEVICE_TABLE(of, i2c_pxa_dt_ids);