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i2c: hisi: Add support to get clock frequency from clock

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The clk_rate attribute is not generic device tree bindings for I2C
busses described in Documentation/devicetree/bindings/i2c/i2c.txt.
It can be managed by clock binding.

Support the driver to obtain clock information by clk_rate or
clock property. Find clock first, if not, fall back to clk_rate.

Signed-off-by: Weilong Chen <chenweilong@huawei.com>
Acked-by: Yicong Yang <yangyicong@hisilicon.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
This commit is contained in:
Weilong Chen 2022-11-08 09:58:11 +08:00 committed by Wolfram Sang
parent d78a167332
commit 3256412fc5
1 changed files with 11 additions and 4 deletions
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15
drivers/i2c/busses/i2c-hisi.c
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@ -7,6 +7,7 @@
#include <linux/bits.h>
#include <linux/bitfield.h>
#include <linux/clk.h>
#include <linux/completion.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
@ -88,6 +89,7 @@ struct hisi_i2c_controller {
struct i2c_adapter adapter;
void __iomem *iobase;
struct device *dev;
struct clk *clk;
int irq;
/* Intermediates for recording the transfer process */
@ -454,10 +456,15 @@ static int hisi_i2c_probe(struct platform_device *pdev)
return ret;
}
ret = device_property_read_u64(dev, "clk_rate", &clk_rate_hz);
if (ret) {
dev_err(dev, "failed to get clock frequency, ret = %d\n", ret);
return ret;
ctlr->clk = devm_clk_get_optional_enabled(&pdev->dev, NULL);
if (IS_ERR_OR_NULL(ctlr->clk)) {
ret = device_property_read_u64(dev, "clk_rate", &clk_rate_hz);
if (ret) {
dev_err(dev, "failed to get clock frequency, ret = %d\n", ret);
return ret;
}
} else {
clk_rate_hz = clk_get_rate(ctlr->clk);
}
ctlr->clk_rate_khz = DIV_ROUND_UP_ULL(clk_rate_hz, HZ_PER_KHZ);