diff options
| author |   Romain Perier <romain.perier@free-electrons.com> | 2016-12-01 12:04:38 +0100 |
|---|---|---|
| committer |   Wolfram Sang <wsa@the-dreams.de> | 2016-12-01 23:34:33 +0100 |
| commit | 294be03c627b469f79ce391dafb163581d3158ba (patch) | |
| tree | c089fa38b34b63134e6198795953a3444c3f344d /drivers/i2c/busses | |
| parent | i2c: pxa: Add definition of fast and high speed modes via the regs layout (diff) | |
| download | wireguard-linux-294be03c627b469f79ce391dafb163581d3158ba.tar.xz wireguard-linux-294be03c627b469f79ce391dafb163581d3158ba.zip | |
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>
Diffstat (limited to 'drivers/i2c/busses')
| -rw-r--r-- | drivers/i2c/busses/Kconfig | 2 | ||||
| -rw-r--r-- | drivers/i2c/busses/i2c-pxa.c | 15 |
2 files changed, 16 insertions, 1 deletions
diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig index 6399ceab402b..3ff7c031e04a 100644 --- a/drivers/i2c/busses/Kconfig +++ b/drivers/i2c/busses/Kconfig @@ -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 diff --git a/drivers/i2c/busses/i2c-pxa.c b/drivers/i2c/busses/i2c-pxa.c index b4ac235c48ff..6cf333ecc8b8 100644 --- a/drivers/i2c/busses/i2c-pxa.c +++ b/drivers/i2c/busses/i2c-pxa.c @@ -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); |