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usb: bdc: Add support for USB phy

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If a phy is specified in the device tree node, get it and use it.
This was based on a patch by:
"Srinath Mannam <srinath.mannam@broadcom.com>"

Signed-off-by: Al Cooper <alcooperx@gmail.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
This commit is contained in:
Al Cooper 2017-07-19 15:11:48 -04:00 committed by Felipe Balbi
parent 3f8b121942
commit cc29d4f677
2 changed files with 75 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/usb/gadget/udc/bdc/bdc.h
View File

@ -413,6 +413,9 @@ struct bdc {
/* device lock */
spinlock_t lock;
/* generic phy */
struct phy **phys;
int num_phys;
/* num of endpoints for a particular instantiation of IP */
unsigned int num_eps;
/*

74
drivers/usb/gadget/udc/bdc/bdc_core.c
View File

@ -24,6 +24,7 @@
#include <linux/dma-mapping.h>
#include <linux/dmapool.h>
#include <linux/of.h>
#include <linux/phy/phy.h>
#include <linux/moduleparam.h>
#include <linux/usb/ch9.h>
#include <linux/usb/gadget.h>
@ -445,6 +446,43 @@ static int bdc_hw_init(struct bdc *bdc)
return 0;
}
static int bdc_phy_init(struct bdc *bdc)
{
int phy_num;
int ret;
for (phy_num = 0; phy_num < bdc->num_phys; phy_num++) {
ret = phy_init(bdc->phys[phy_num]);
if (ret)
goto err_exit_phy;
ret = phy_power_on(bdc->phys[phy_num]);
if (ret) {
phy_exit(bdc->phys[phy_num]);
goto err_exit_phy;
}
}
return 0;
err_exit_phy:
while (--phy_num >= 0) {
phy_power_off(bdc->phys[phy_num]);
phy_exit(bdc->phys[phy_num]);
}
return ret;
}
static void bdc_phy_exit(struct bdc *bdc)
{
int phy_num;
for (phy_num = 0; phy_num < bdc->num_phys; phy_num++) {
phy_power_off(bdc->phys[phy_num]);
phy_exit(bdc->phys[phy_num]);
}
}
static int bdc_probe(struct platform_device *pdev)
{
struct bdc *bdc;
@ -454,6 +492,7 @@ static int bdc_probe(struct platform_device *pdev)
u32 temp;
struct device *dev = &pdev->dev;
struct clk *clk;
int phy_num;
dev_dbg(dev, "%s()\n", __func__);
@ -492,6 +531,35 @@ static int bdc_probe(struct platform_device *pdev)
bdc->dev = dev;
dev_dbg(dev, "bdc->regs: %p irq=%d\n", bdc->regs, bdc->irq);
bdc->num_phys = of_count_phandle_with_args(dev->of_node,
"phys", "#phy-cells");
if (bdc->num_phys > 0) {
bdc->phys = devm_kcalloc(dev, bdc->num_phys,
sizeof(struct phy *), GFP_KERNEL);
if (!bdc->phys)
return -ENOMEM;
} else {
bdc->num_phys = 0;
}
dev_info(dev, "Using %d phy(s)\n", bdc->num_phys);
for (phy_num = 0; phy_num < bdc->num_phys; phy_num++) {
bdc->phys[phy_num] = devm_of_phy_get_by_index(
dev, dev->of_node, phy_num);
if (IS_ERR(bdc->phys[phy_num])) {
ret = PTR_ERR(bdc->phys[phy_num]);
dev_err(bdc->dev,
"BDC phy specified but not found:%d\n", ret);
return ret;
}
}
ret = bdc_phy_init(bdc);
if (ret) {
dev_err(bdc->dev, "BDC phy init failure:%d\n", ret);
return ret;
}
temp = bdc_readl(bdc->regs, BDC_BDCCAP1);
if ((temp & BDC_P64) &&
!dma_set_mask_and_coherent(dev, DMA_BIT_MASK(64))) {
@ -508,7 +576,7 @@ static int bdc_probe(struct platform_device *pdev)
ret = bdc_hw_init(bdc);
if (ret) {
dev_err(dev, "BDC init failure:%d\n", ret);
return ret;
goto phycleanup;
}
ret = bdc_udc_init(bdc);
if (ret) {
@ -519,7 +587,8 @@ static int bdc_probe(struct platform_device *pdev)
cleanup:
bdc_hw_exit(bdc);
phycleanup:
bdc_phy_exit(bdc);
return ret;
}
@ -531,6 +600,7 @@ static int bdc_remove(struct platform_device *pdev)
dev_dbg(bdc->dev, "%s ()\n", __func__);
bdc_udc_exit(bdc);
bdc_hw_exit(bdc);
bdc_phy_exit(bdc);
clk_disable_unprepare(bdc->clk);
return 0;
}