GSBI Configuration for I2C on quaclomm Android msm8660

Question: What steps should be followed for the configuration of a particular GSBI for I2C on 8660 ?


Answer: Steps to be followed for the GSBI configuration for I2C:


Suppose the GSBIx is to be configured:


1) In file devices-msm8x60.c, add:
static struct resource gsbix_qup_i2c_resources[] = {
{
.name = "qup_phys_addr",
.start = MSM_GSBIx_QUP_PHYS,
.end = MSM_GSBIx_QUP_PHYS + SZ_4K - 1,
.flags = IORESOURCE_MEM,
},
{
.name = "gsbi_qup_i2c_addr",
.start = MSM_GSBIx_PHYS,
.end = MSM_GSBIx_PHYS + 4 - 1,
.flags = IORESOURCE_MEM,
},
{
.name = "qup_err_intr",
.start = GSBIx_QUP_IRQ,
.end = GSBIx_QUP_IRQ,
.flags = IORESOURCE_IRQ,
},
};


/* Use GSBIx QUP for /dev/i2c-5 (i.e. if i2c-5 has not been used before else choose the next number) */
struct platform_device msm_gsbix_qup_i2c_device = {
.name = "qup_i2c",
/* this BUS_ID has been mapped to 5 inside the file devices-msm8x60.h. this part has been explained below */
.id = MSM_GSBIx_QUP_I2C_BUS_ID,
.num_resources = ARRAY_SIZE(gsbix_qup_i2c_resources),
.resource = gsbix_qup_i2c_resources,
};

In the same file, inside the structure, struct clk msm_clocks_8x60[] = {
/* change the following : */
CLK_8X60("gsbi_qup_clk", GSBIx_QUP_CLK, NULL , 0),
/* to: */
CLK_8X60("gsbi_qup_clk", GSBIx_QUP_CLK, &msm_gsbix_qup_i2c_device.dev, 0),

/* and change the following: */
CLK_8X60("gsbi_pclk", GSBIx_P_CLK, NULL , 0),
/* to: */
CLK_8X60("gsbi_pclk", GSBIx_P_CLK, &msm_gsbix_qup_i2c_device.dev, 0),

2) In file board-msm8x60.c:

A) Add
static struct msm_i2c_platform_data msm_gsbix_qup_i2c_pdata = {
.clk_freq = 100000,
.src_clk_rate = 24000000,
.clk = "gsbi_qup_clk",
.pclk = "gsbi_pclk",
.msm_i2c_config_gpio = gsbi_qup_i2c_gpio_config,
};

B) Modify
static struct platform_device *surf_devices[] __initdata = {
/* add the following: */
&msm_gsbix_qup_i2c_device,

C) Add
/* in section #ifdef CONFIG_I2C_QUP of msm8x60_init_buses() , add */
msm_gsbix_qup_i2c_device.dev.platform_data = &msm_gsbix_qup_i2c_pdata;

3) In file devices.h, add:
extern struct platform_device msm_gsbix_qup_i2c_device;

4) in file devices-msm8x60.h, add:
/* if 5 has already been used, then the next consecutive number */
#define MSM_GSBIx_QUP_I2C_BUS_ID 5