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media: spi: add mclk for rk1608 driver

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RK1608 requires 24M mclk to power on. Some boards(like our
rk1608 board) use external clock source, some are not.

This patch adds 24M mclk reference in rk1608 driver, and
enables it when power on, disables when power off.

Change-Id: I97dc5eeb7c921b53aa2b1edc70926b43a6cc18cd
Signed-off-by: Shunqian Zheng <zhengsq@rock-chips.com>
This commit is contained in:
Shunqian Zheng 2019-07-22 02:31:04 +00:00 committed by Tao Huang
parent c80b0a1ae8
commit 16ee2323d8
2 changed files with 24 additions and 0 deletions
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22
drivers/media/spi/rk1608.c
View File

@ -813,6 +813,21 @@ static int rk1608_power_on(struct rk1608_state *pdata)
struct spi_device *spi = pdata->spi;
int ret = 0;
if (!IS_ERR(pdata->mclk)) {
ret = clk_set_rate(pdata->mclk, RK1608_MCLK_RATE);
if (ret < 0)
dev_warn(pdata->dev, "Failed to set mclk rate\n");
if (clk_get_rate(pdata->mclk) != RK1608_MCLK_RATE)
dev_warn(pdata->dev, "mclk(%lu) mismatched\n",
clk_get_rate(pdata->mclk));
ret = clk_prepare_enable(pdata->mclk);
if (ret < 0)
dev_warn(pdata->dev, "Failed to enable mclk\n");
else
usleep_range(3000, 3500);
}
/* Request rk1608 enter slave mode */
rk1608_cs_set_value(pdata, 0);
if (pdata->wakeup_gpio)
@ -862,6 +877,9 @@ static int rk1608_power_off(struct rk1608_state *pdata)
gpiod_direction_output(pdata->reset_gpio, 0);
rk1608_cs_set_value(pdata, 0);
if (!IS_ERR(pdata->mclk))
clk_disable_unprepare(pdata->mclk);
return 0;
}
@ -1556,6 +1574,10 @@ static int rk1608_parse_dt_property(struct rk1608_state *pdata)
return PTR_ERR(pdata->aesync_gpio);
}
pdata->mclk = devm_clk_get(dev, "mclk");
if (IS_ERR(pdata->mclk))
dev_warn(dev, "Failed to get mclk, do you use ext 24M clk?\n");
pdata->msg_num = 0;
init_waitqueue_head(&pdata->msg_wait);
for (i = 0; i < 8; i++)

2
drivers/media/spi/rk1608.h
View File

@ -9,6 +9,7 @@
#ifndef __RK1608_H__
#define __RK1608_H__
#include <linux/clk.h>
#include <linux/spi/spi.h>
#include <linux/miscdevice.h>
#include <linux/version.h>
@ -105,6 +106,7 @@ struct rk1608_state {
struct v4l2_subdev *sensor[4];
struct device *dev;
struct spi_device *spi;
struct clk *mclk;
struct miscdevice misc;
struct rk1608_client_list clients;
int log_level;