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i2c: exynos5: Describe the hardware variant for readability 

The driver supports multiple hardware variants of Exynos I2C controller
which differ in FIFO depth, handling of interrupts and bus recovery in
HSI2C_MASTER_ST_LOSE state.

The difference in variant was a single bit set for Exynos7 variants and
implicit lack of this bit for other variants.

Make each variant explicit which also fixes the GCC warning about
documentation:

    drivers/i2c/busses/i2c-exynos5.c:223: warning: Function parameter or member 'hw' not described in 'exynos_hsi2c_variant'

No change in functionality.

Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Reviewed-by: Andrzej Hajda <a.hajda@samsung.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Krzysztof Kozlowski 2018-07-18 21:54:04 +02:00 committed by Wolfram Sang
parent c4ae05b976
commit eebfd44399
1 changed files with 14 additions and 8 deletions
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22
drivers/i2c/busses/i2c-exynos5.c
View File

@ -176,7 +176,10 @@
#define EXYNOS5_I2C_TIMEOUT (msecs_to_jiffies(100))
#define HSI2C_EXYNOS7 BIT(0)
enum i2c_type_exynos {
I2C_TYPE_EXYNOS5,
I2C_TYPE_EXYNOS7,
};
struct exynos5_i2c {
struct i2c_adapter adap;
@ -212,27 +215,30 @@ struct exynos5_i2c {
/**
* struct exynos_hsi2c_variant - platform specific HSI2C driver data
* @fifo_depth: the fifo depth supported by the HSI2C module
* @hw: the hardware variant of Exynos I2C controller
*
* Specifies platform specific configuration of HSI2C module.
* Note: A structure for driver specific platform data is used for future
* expansion of its usage.
*/
struct exynos_hsi2c_variant {
unsigned int fifo_depth;
unsigned int hw;
unsigned int fifo_depth;
enum i2c_type_exynos hw;
};
static const struct exynos_hsi2c_variant exynos5250_hsi2c_data = {
.fifo_depth = 64,
.hw = I2C_TYPE_EXYNOS5,
};
static const struct exynos_hsi2c_variant exynos5260_hsi2c_data = {
.fifo_depth = 16,
.hw = I2C_TYPE_EXYNOS5,
};
static const struct exynos_hsi2c_variant exynos7_hsi2c_data = {
.fifo_depth = 16,
.hw = HSI2C_EXYNOS7,
.hw = I2C_TYPE_EXYNOS7,
};
static const struct of_device_id exynos5_i2c_match[] = {
@ -300,7 +306,7 @@ static int exynos5_i2c_set_timing(struct exynos5_i2c *i2c, bool hs_timings)
*/
t_ftl_cycle = (readl(i2c->regs + HSI2C_CONF) >> 16) & 0x7;
temp = clkin / op_clk - 8 - t_ftl_cycle;
if (i2c->variant->hw != HSI2C_EXYNOS7)
if (i2c->variant->hw != I2C_TYPE_EXYNOS7)
temp -= t_ftl_cycle;
div = temp / 512;
clk_cycle = temp / (div + 1) - 2;
@ -424,7 +430,7 @@ static irqreturn_t exynos5_i2c_irq(int irqno, void *dev_id)
writel(int_status, i2c->regs + HSI2C_INT_STATUS);
/* handle interrupt related to the transfer status */
if (i2c->variant->hw == HSI2C_EXYNOS7) {
if (i2c->variant->hw == I2C_TYPE_EXYNOS7) {
if (int_status & HSI2C_INT_TRANS_DONE) {
i2c->trans_done = 1;
i2c->state = 0;
@ -571,7 +577,7 @@ static void exynos5_i2c_bus_check(struct exynos5_i2c *i2c)
{
unsigned long timeout;
if (i2c->variant->hw != HSI2C_EXYNOS7)
if (i2c->variant->hw != I2C_TYPE_EXYNOS7)
return;
/*
@ -612,7 +618,7 @@ static void exynos5_i2c_message_start(struct exynos5_i2c *i2c, int stop)
unsigned long flags;
unsigned short trig_lvl;
if (i2c->variant->hw == HSI2C_EXYNOS7)
if (i2c->variant->hw == I2C_TYPE_EXYNOS7)
int_en |= HSI2C_INT_I2C_TRANS;
else
int_en |= HSI2C_INT_I2C;