Subject: Re: [PATCH 1/3] usb: gadget: udc: atmel: Don't use DT to configure end point

From: <[email-masked]>
Date: Fri, 22 Nov 2019 16:02:45 +0000

On 11/22/19 4:50 PM, Gregory CLEMENT wrote:

> Hello,
> 
>> The endpoint configuration used to be stored in the device tree,
>> however the configuration depend on the "version" of the controller
>> itself.
>>
>> This information is already documented by the compatible string. It
>> then possible to just rely on the compatible string and completely
>> remove the full ep configuration done in the device tree as it was
>> already the case for all the other USB device controller.
> 
> Do you have any feedback about this patch ?
> 
> The binding being reviewed is there any chance that this patch will be
> merged?

Hi Gregory,

Thank you for sending the patch. It looks good to me.

I checked it briefly on sama5d2 with the in kernel cdc-acm.

> 
> Thanks,
> 
> Gregory
> 
> 
>>
>> Signed-off-by: Gregory CLEMENT <[email-masked]>
Acked-by: Cristian Birsan <[email-masked]>

>> ---
>>   drivers/usb/gadget/udc/atmel_usba_udc.c | 112 +++++++++++++++---------
>>   drivers/usb/gadget/udc/atmel_usba_udc.h |  12 +++
>>   2 files changed, 84 insertions(+), 40 deletions(-)
>>
>> diff --git a/drivers/usb/gadget/udc/atmel_usba_udc.c b/drivers/usb/gadget/udc/atmel_usba_udc.c
>> index 86ffc8307864..2db833caeb09 100644
>> --- a/drivers/usb/gadget/udc/atmel_usba_udc.c
>> +++ b/drivers/usb/gadget/udc/atmel_usba_udc.c
>> @@ -2040,10 +2040,56 @@ static const struct usba_udc_errata at91sam9g45_errata = {
>>        .pulse_bias = at91sam9g45_pulse_bias,
>>   };
>>
>> +static const struct usba_ep_config ep_config_sam9[] __initconst = {
>> +     { .nr_banks = 1 },                              /* ep 0 */
>> +     { .nr_banks = 2, .can_dma = 1, .can_isoc = 1 }, /* ep 1 */
>> +     { .nr_banks = 2, .can_dma = 1, .can_isoc = 1 }, /* ep 2 */
>> +     { .nr_banks = 3, .can_dma = 1 },                /* ep 3 */
>> +     { .nr_banks = 3, .can_dma = 1 },                /* ep 4 */
>> +     { .nr_banks = 3, .can_dma = 1, .can_isoc = 1 }, /* ep 5 */
>> +     { .nr_banks = 3, .can_dma = 1, .can_isoc = 1 }, /* ep 6 */
>> +};
>> +
>> +static const struct usba_ep_config ep_config_sama5[] __initconst = {
>> +     { .nr_banks = 1 },                              /* ep 0 */
>> +     { .nr_banks = 3, .can_dma = 1, .can_isoc = 1 }, /* ep 1 */
>> +     { .nr_banks = 3, .can_dma = 1, .can_isoc = 1 }, /* ep 2 */
>> +     { .nr_banks = 2, .can_dma = 1, .can_isoc = 1 }, /* ep 3 */
>> +     { .nr_banks = 2, .can_dma = 1, .can_isoc = 1 }, /* ep 4 */
>> +     { .nr_banks = 2, .can_dma = 1, .can_isoc = 1 }, /* ep 5 */
>> +     { .nr_banks = 2, .can_dma = 1, .can_isoc = 1 }, /* ep 6 */
>> +     { .nr_banks = 2, .can_dma = 1, .can_isoc = 1 }, /* ep 7 */
>> +     { .nr_banks = 2, .can_isoc = 1 },               /* ep 8 */
>> +     { .nr_banks = 2, .can_isoc = 1 },               /* ep 9 */
>> +     { .nr_banks = 2, .can_isoc = 1 },               /* ep 10 */
>> +     { .nr_banks = 2, .can_isoc = 1 },               /* ep 11 */
>> +     { .nr_banks = 2, .can_isoc = 1 },               /* ep 12 */
>> +     { .nr_banks = 2, .can_isoc = 1 },               /* ep 13 */
>> +     { .nr_banks = 2, .can_isoc = 1 },               /* ep 14 */
>> +     { .nr_banks = 2, .can_isoc = 1 },               /* ep 15 */
>> +};
>> +
>> +static const struct usba_udc_config udc_at91sam9rl_cfg = {
>> +     .errata = &at91sam9rl_errata,
>> +     .config = ep_config_sam9,
>> +     .num_ep = ARRAY_SIZE(ep_config_sam9),
>> +};
>> +
>> +static const struct usba_udc_config udc_at91sam9g45_cfg = {
>> +     .errata = &at91sam9g45_errata,
>> +     .config = ep_config_sam9,
>> +     .num_ep = ARRAY_SIZE(ep_config_sam9),
>> +};
>> +
>> +static const struct usba_udc_config udc_sama5d3_cfg = {
>> +     .config = ep_config_sama5,
>> +     .num_ep = ARRAY_SIZE(ep_config_sama5),
>> +};
>> +
>>   static const struct of_device_id atmel_udc_dt_ids[] = {
>> -     { .compatible = "atmel,at91sam9rl-udc", .data = &at91sam9rl_errata },
>> -     { .compatible = "atmel,at91sam9g45-udc", .data = &at91sam9g45_errata },
>> -     { .compatible = "atmel,sama5d3-udc" },
>> +     { .compatible = "atmel,at91sam9rl-udc", .data = &udc_at91sam9rl_cfg },
>> +     { .compatible = "atmel,at91sam9g45-udc", .data = &udc_at91sam9g45_cfg },
>> +     { .compatible = "atmel,sama5d3-udc", .data = &udc_sama5d3_cfg },
>>        { /* sentinel */ }
>>   };
>>
>> @@ -2052,18 +2098,19 @@ MODULE_DEVICE_TABLE(of, atmel_udc_dt_ids);
>>   static struct usba_ep * atmel_udc_of_init(struct platform_device *pdev,
>>                                                    struct usba_udc *udc)
>>   {
>> -     u32 val;
>>        struct device_node *np = pdev->dev.of_node;
>>        const struct of_device_id *match;
>>        struct device_node *pp;
>>        int i, ret;
>>        struct usba_ep *eps, *ep;
>> +     const struct usba_udc_config *udc_config;
>>
>>        match = of_match_node(atmel_udc_dt_ids, np);
>>        if (!match)
>>                return ERR_PTR(-EINVAL);
>>
>> -     udc->errata = match->data;
>> +     udc_config = match->data;
>> +     udc->errata = udc_config->errata;
>>        udc->pmc = syscon_regmap_lookup_by_compatible("atmel,at91sam9g45-pmc");
>>        if (IS_ERR(udc->pmc))
>>                udc->pmc = syscon_regmap_lookup_by_compatible("atmel,at91sam9rl-pmc");
>> @@ -2079,8 +2126,7 @@ static struct usba_ep * atmel_udc_of_init(struct platform_device *pdev,
>>
>>        if (fifo_mode == 0) {
>>                pp = NULL;
>> -             while ((pp = of_get_next_child(np, pp)))
>> -                     udc->num_ep++;
>> +             udc->num_ep = udc_config->num_ep;
>>                udc->configured_ep = 1;
>>        } else {
>>                udc->num_ep = usba_config_fifo_table(udc);
>> @@ -2097,52 +2143,38 @@ static struct usba_ep * atmel_udc_of_init(struct platform_device *pdev,
>>
>>        pp = NULL;
>>        i = 0;
>> -     while ((pp = of_get_next_child(np, pp)) && i < udc->num_ep) {
>> +     while (i < udc->num_ep) {
>> +             const struct usba_ep_config *ep_cfg = &udc_config->config[i];
>> +
>>                ep = &eps[i];
>>
>> -             ret = of_property_read_u32(pp, "reg", &val);
>> -             if (ret) {
>> -                     dev_err(&pdev->dev, "of_probe: reg error(%d)\n", ret);
>> -                     goto err;
>> -             }
>> -             ep->index = fifo_mode ? udc->fifo_cfg[i].hw_ep_num : val;
>> +             ep->index = fifo_mode ? udc->fifo_cfg[i].hw_ep_num : i;
>> +
>> +             /* Only the first EP is 64 bytes */
>> +             if (ep->index == 0)
>> +                     ep->fifo_size = 64;
>> +             else
>> +                     ep->fifo_size = 1024;
>>
>> -             ret = of_property_read_u32(pp, "atmel,fifo-size", &val);
>> -             if (ret) {
>> -                     dev_err(&pdev->dev, "of_probe: fifo-size error(%d)\n", ret);
>> -                     goto err;
>> -             }
>>                if (fifo_mode) {
>> -                     if (val < udc->fifo_cfg[i].fifo_size) {
>> +                     if (ep->fifo_size < udc->fifo_cfg[i].fifo_size)
>>                                dev_warn(&pdev->dev,
>> -                                      "Using max fifo-size value from DT\n");
>> -                             ep->fifo_size = val;
>> -                     } else {
>> +                                      "Using default max fifo-size value\n");
>> +                     else
>>                                ep->fifo_size = udc->fifo_cfg[i].fifo_size;
>> -                     }
>> -             } else {
>> -                     ep->fifo_size = val;
>>                }
>>
>> -             ret = of_property_read_u32(pp, "atmel,nb-banks", &val);
>> -             if (ret) {
>> -                     dev_err(&pdev->dev, "of_probe: nb-banks error(%d)\n", ret);
>> -                     goto err;
>> -             }
>> +             ep->nr_banks = ep_cfg->nr_banks;
>>                if (fifo_mode) {
>> -                     if (val < udc->fifo_cfg[i].nr_banks) {
>> +                     if (ep->nr_banks < udc->fifo_cfg[i].nr_banks)
>>                                dev_warn(&pdev->dev,
>> -                                      "Using max nb-banks value from DT\n");
>> -                             ep->nr_banks = val;
>> -                     } else {
>> +                                      "Using default max nb-banks value\n");
>> +                     else
>>                                ep->nr_banks = udc->fifo_cfg[i].nr_banks;
>> -                     }
>> -             } else {
>> -                     ep->nr_banks = val;
>>                }
>>
>> -             ep->can_dma = of_property_read_bool(pp, "atmel,can-dma");
>> -             ep->can_isoc = of_property_read_bool(pp, "atmel,can-isoc");
>> +             ep->can_dma = ep_cfg->can_dma;
>> +             ep->can_isoc = ep_cfg->can_isoc;
>>
>>                sprintf(ep->name, "ep%d", ep->index);
>>                ep->ep.name = ep->name;
>> diff --git a/drivers/usb/gadget/udc/atmel_usba_udc.h b/drivers/usb/gadget/udc/atmel_usba_udc.h
>> index a0225e4543d4..48e332439ed5 100644
>> --- a/drivers/usb/gadget/udc/atmel_usba_udc.h
>> +++ b/drivers/usb/gadget/udc/atmel_usba_udc.h
>> @@ -290,6 +290,12 @@ struct usba_ep {
>>   #endif
>>   };
>>
>> +struct usba_ep_config {
>> +     u8                                      nr_banks;
>> +     unsigned int                            can_dma:1;
>> +     unsigned int                            can_isoc:1;
>> +};
>> +
>>   struct usba_request {
>>        struct usb_request                      req;
>>        struct list_head                        queue;
>> @@ -307,6 +313,12 @@ struct usba_udc_errata {
>>        void (*pulse_bias)(struct usba_udc *udc);
>>   };
>>
>> +struct usba_udc_config {
>> +     const struct usba_udc_errata *errata;
>> +     const struct usba_ep_config *config;
>> +     const int num_ep;
>> +};
>> +
>>   struct usba_udc {
>>        /* Protect hw registers from concurrent modifications */
>>        spinlock_t lock;
>> --
>> 2.24.0.rc1
>>
> 
> --
> Gregory Clement, Bootlin
> Embedded Linux and Kernel engineering
> http://bootlin.com
> 

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