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pwm: mediatek: Add MT2712/MT7622 support

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Add support for MT2712 and MT7622. Due to register offset address of
pwm7 for MT2712 is not fixed 0x40, add mtk_pwm_reg_offset array for PWM
register offset.

Reviewed-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Reviewed-by: Matthias Brugger <matthias.bgg@gmail.com>
Signed-off-by: Zhi Mao <zhi.mao@mediatek.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
This commit is contained in:
Zhi Mao 2017-10-25 18:11:01 +08:00 committed by Thierry Reding
parent df4f6e8c9f
commit 424268c749
1 changed files with 44 additions and 9 deletions
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53
drivers/pwm/pwm-mediatek.c
View file

@ -16,6 +16,7 @@
#include <linux/module.h>
#include <linux/clk.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/pwm.h>
#include <linux/slab.h>
@ -40,11 +41,19 @@ enum {
MTK_CLK_PWM3,
MTK_CLK_PWM4,
MTK_CLK_PWM5,
MTK_CLK_PWM6,
MTK_CLK_PWM7,
MTK_CLK_PWM8,
MTK_CLK_MAX,
};
static const char * const mtk_pwm_clk_name[] = {
"main", "top", "pwm1", "pwm2", "pwm3", "pwm4", "pwm5"
static const char * const mtk_pwm_clk_name[MTK_CLK_MAX] = {
"main", "top", "pwm1", "pwm2", "pwm3", "pwm4", "pwm5", "pwm6", "pwm7",
"pwm8"
};
struct mtk_pwm_platform_data {
unsigned int num_pwms;
};
/**
@ -59,6 +68,10 @@ struct mtk_pwm_chip {
struct clk *clks[MTK_CLK_MAX];
};
static const unsigned int mtk_pwm_reg_offset[] = {
0x0010, 0x0050, 0x0090, 0x00d0, 0x0110, 0x0150, 0x0190, 0x0220
};
static inline struct mtk_pwm_chip *to_mtk_pwm_chip(struct pwm_chip *chip)
{
return container_of(chip, struct mtk_pwm_chip, chip);
@ -103,14 +116,14 @@ static void mtk_pwm_clk_disable(struct pwm_chip *chip, struct pwm_device *pwm)
static inline u32 mtk_pwm_readl(struct mtk_pwm_chip *chip, unsigned int num,
unsigned int offset)
{
return readl(chip->regs + 0x10 + (num * 0x40) + offset);
return readl(chip->regs + mtk_pwm_reg_offset[num] + offset);
}
static inline void mtk_pwm_writel(struct mtk_pwm_chip *chip,
unsigned int num, unsigned int offset,
u32 value)
{
writel(value, chip->regs + 0x10 + (num * 0x40) + offset);
writel(value, chip->regs + mtk_pwm_reg_offset[num] + offset);
}
static int mtk_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
@ -185,6 +198,7 @@ static const struct pwm_ops mtk_pwm_ops = {
static int mtk_pwm_probe(struct platform_device *pdev)
{
const struct mtk_pwm_platform_data *data;
struct mtk_pwm_chip *pc;
struct resource *res;
unsigned int i;
@ -194,15 +208,22 @@ static int mtk_pwm_probe(struct platform_device *pdev)
if (!pc)
return -ENOMEM;
data = of_device_get_match_data(&pdev->dev);
if (data == NULL)
return -EINVAL;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
pc->regs = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(pc->regs))
return PTR_ERR(pc->regs);
for (i = 0; i < MTK_CLK_MAX; i++) {
for (i = 0; i < data->num_pwms + 2; i++) {
pc->clks[i] = devm_clk_get(&pdev->dev, mtk_pwm_clk_name[i]);
if (IS_ERR(pc->clks[i]))
if (IS_ERR(pc->clks[i])) {
dev_err(&pdev->dev, "clock: %s fail: %ld\n",
mtk_pwm_clk_name[i], PTR_ERR(pc->clks[i]));
return PTR_ERR(pc->clks[i]);
}
}
platform_set_drvdata(pdev, pc);
@ -210,7 +231,7 @@ static int mtk_pwm_probe(struct platform_device *pdev)
pc->chip.dev = &pdev->dev;
pc->chip.ops = &mtk_pwm_ops;
pc->chip.base = -1;
pc->chip.npwm = 5;
pc->chip.npwm = data->num_pwms;
ret = pwmchip_add(&pc->chip);
if (ret < 0) {
@ -228,9 +249,23 @@ static int mtk_pwm_remove(struct platform_device *pdev)
return pwmchip_remove(&pc->chip);
}
static const struct mtk_pwm_platform_data mt2712_pwm_data = {
.num_pwms = 8,
};
static const struct mtk_pwm_platform_data mt7622_pwm_data = {
.num_pwms = 6,
};
static const struct mtk_pwm_platform_data mt7623_pwm_data = {
.num_pwms = 5,
};
static const struct of_device_id mtk_pwm_of_match[] = {
{ .compatible = "mediatek,mt7623-pwm" },
{ }
{ .compatible = "mediatek,mt2712-pwm", .data = &mt2712_pwm_data },
{ .compatible = "mediatek,mt7622-pwm", .data = &mt7622_pwm_data },
{ .compatible = "mediatek,mt7623-pwm", .data = &mt7623_pwm_data },
{ },
};
MODULE_DEVICE_TABLE(of, mtk_pwm_of_match);