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watchdog: sp805_wdt: get platform clock from dt file

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Get the watchdog platform clock from the DTS file
using clk subsystem and use the same for calculating
ticks in msec.

Signed-off-by: Rayagonda Kokatanur <rayagonda.kokatanur@broadcom.com>
Signed-off-by: Bharat Kumar Reddy Gooty <bharat.gooty@broadcom.com>
Reviewed-by: Stefan Roese <sr@denx.de>
This commit is contained in:
Rayagonda Kokatanur 2020-04-06 13:29:52 +05:30 committed by Stefan Roese
parent 40d7f3c8d1
commit 19a159f94a
1 changed files with 13 additions and 2 deletions
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15
drivers/watchdog/sp805_wdt.c
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@ -7,6 +7,7 @@
#include <asm/io.h> #include <asm/io.h>
#include <common.h> #include <common.h>
#include <clk.h>
#include <dm/device.h> #include <dm/device.h>
#include <dm/fdtaddr.h> #include <dm/fdtaddr.h>
#include <dm/read.h> #include <dm/read.h>
@ -34,6 +35,7 @@ DECLARE_GLOBAL_DATA_PTR;
struct sp805_wdt_priv { struct sp805_wdt_priv {
void __iomem *reg; void __iomem *reg;
unsigned long clk_rate;
}; };
static int sp805_wdt_reset(struct udevice *dev) static int sp805_wdt_reset(struct udevice *dev)
@ -63,8 +65,13 @@ static int sp805_wdt_start(struct udevice *dev, u64 timeout, ulong flags)
* set 120s, the gd->bus_clk is less than 1145MHz, the load_value will * set 120s, the gd->bus_clk is less than 1145MHz, the load_value will
* not overflow. * not overflow.
*/ */
load_value = (gd->bus_clk) / if (gd->bus_clk) {
(2 * 1000 * SYS_FSL_WDT_CLK_DIV) * load_time; load_value = (gd->bus_clk) /
(2 * 1000 * SYS_FSL_WDT_CLK_DIV) * load_time;
} else {
/* platform provide clk */
load_value = (timeout / 2) * (priv->clk_rate / 1000);
}
writel(UNLOCK, priv->reg + WDTLOCK); writel(UNLOCK, priv->reg + WDTLOCK);
writel(load_value, priv->reg + WDTLOAD); writel(load_value, priv->reg + WDTLOAD);
@ -105,11 +112,15 @@ static int sp805_wdt_probe(struct udevice *dev)
static int sp805_wdt_ofdata_to_platdata(struct udevice *dev) static int sp805_wdt_ofdata_to_platdata(struct udevice *dev)
{ {
struct sp805_wdt_priv *priv = dev_get_priv(dev); struct sp805_wdt_priv *priv = dev_get_priv(dev);
struct clk clk;
priv->reg = (void __iomem *)dev_read_addr(dev); priv->reg = (void __iomem *)dev_read_addr(dev);
if (IS_ERR(priv->reg)) if (IS_ERR(priv->reg))
return PTR_ERR(priv->reg); return PTR_ERR(priv->reg);
if (!clk_get_by_index(dev, 0, &clk))
priv->clk_rate = clk_get_rate(&clk);
return 0; return 0;
} }