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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: Romain Perier <romain.perier@free-electrons.com>
Tested-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Romain Perier 2016-12-01 12:04:38 +01:00 committed by Wolfram Sang
parent 6c14bdacdb
commit 294be03c62
2 changed files with 16 additions and 1 deletions
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2
drivers/i2c/busses/Kconfig
View File

@ -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

15
drivers/i2c/busses/i2c-pxa.c
View File

@ -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);