To configure the send and echo delays
Signed-off-by: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
---
drivers/fsi/fsi-master-gpio.c | 27 +++++++++++++++++++++++++--
1 file changed, 25 insertions(+), 2 deletions(-)
diff --git a/drivers/fsi/fsi-master-gpio.c b/drivers/fsi/fsi-master-gpio.c
index 836587701ceb..48e0e65b2982 100644
--- a/drivers/fsi/fsi-master-gpio.c
+++ b/drivers/fsi/fsi-master-gpio.c
@@ -64,6 +64,8 @@ struct fsi_master_gpio {
bool external_mode;
bool no_delays;
uint32_t last_addr;
+ uint8_t t_send_delay;
+ uint8_t t_echo_delay;
};
#define CREATE_TRACE_POINTS
@@ -338,7 +340,7 @@ static void build_epoll_command(struct fsi_gpio_msg *cmd, uint8_t slave_id)
static void echo_delay(struct fsi_master_gpio *master)
{
set_sda_output(master, 1);
- clock_toggle(master, FSI_ECHO_DELAY_CLOCKS);
+ clock_toggle(master, master->t_echo_delay);
}
static void build_term_command(struct fsi_gpio_msg *cmd, uint8_t slave_id)
@@ -540,7 +542,7 @@ static int poll_for_response(struct fsi_master_gpio *master,
* from receive of response back to send of data.
*/
local_irq_save(flags);
- clock_zeros(master, FSI_SEND_DELAY_CLOCKS);
+ clock_zeros(master, master->t_send_delay);
local_irq_restore(flags);
return rc;
@@ -728,6 +730,22 @@ static int fsi_master_gpio_link_enable(struct fsi_master *_master, int link)
return rc;
}
+static int fsi_master_gpio_link_config(struct fsi_master *_master, int link,
+ u8 t_send_delay, u8 t_echo_delay)
+{
+ struct fsi_master_gpio *master = to_fsi_master_gpio(_master);
+
+ if (link != 0)
+ return -ENODEV;
+
+ mutex_lock(&master->cmd_lock);
+ master->t_send_delay = t_send_delay;
+ master->t_echo_delay = t_echo_delay;
+ mutex_unlock(&master->cmd_lock);
+
+ return 0;
+}
+
static ssize_t external_mode_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
@@ -832,6 +850,10 @@ static int fsi_master_gpio_probe(struct platform_device *pdev)
*/
master->no_delays = device_property_present(&pdev->dev, "no-gpio-delays");
+ /* Default FSI command delays */
+ master->t_send_delay = FSI_SEND_DELAY_CLOCKS;
+ master->t_echo_delay = FSI_ECHO_DELAY_CLOCKS;
+
master->master.n_links = 1;
master->master.flags = FSI_MASTER_FLAG_SWCLOCK;
master->master.read = fsi_master_gpio_read;
@@ -839,6 +861,7 @@ static int fsi_master_gpio_probe(struct platform_device *pdev)
master->master.term = fsi_master_gpio_term;
master->master.send_break = fsi_master_gpio_break;
master->master.link_enable = fsi_master_gpio_link_enable;
+ master->master.link_config = fsi_master_gpio_link_config;
platform_set_drvdata(pdev, master);
mutex_init(&master->cmd_lock);
--
2.17.1
--
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