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Date: Fri, 31 Jan 2014 13:45:30 +0100
From: Florian Vaussard <florian.vaussard@...l.ch>
To: Marc Kleine-Budde <mkl@...gutronix.de>,
Wolfgang Grandegger <wg@...ndegger.com>
CC: linux-can@...r.kernel.org, netdev@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 4/6] can: sja1000: fuse of_platform into platform
Hello Marc,
On 01/31/2014 01:33 PM, Marc Kleine-Budde wrote:
> On 01/31/2014 11:35 AM, Florian Vaussard wrote:
>> The OpenFirmware probe can be merged into the standard platform
>> probe to leverage common code.
>
> Good work, as we want to replace the existing driver, I'm quite picky on
> this patch, see more comments inline.
>
> Please don't delete of of_platform driver, yet.
>
Do you have any reason for not deleting of_platform? After this patch,
we will have duplicated functionalities, this may be misleading for
other people.
Regards,
Florian
>> Signed-off-by: Florian Vaussard <florian.vaussard@...l.ch>
>> ---
>> drivers/net/can/sja1000/Kconfig | 13 +-
>> drivers/net/can/sja1000/Makefile | 1 -
>> drivers/net/can/sja1000/sja1000_of_platform.c | 218 --------------------------
>> drivers/net/can/sja1000/sja1000_platform.c | 141 +++++++++++++----
>> 4 files changed, 116 insertions(+), 257 deletions(-)
>> delete mode 100644 drivers/net/can/sja1000/sja1000_of_platform.c
> [...]
>
>> diff --git a/drivers/net/can/sja1000/sja1000_platform.c b/drivers/net/can/sja1000/sja1000_platform.c
>> index 779679a..96a92a1 100644
>> --- a/drivers/net/can/sja1000/sja1000_platform.c
>> +++ b/drivers/net/can/sja1000/sja1000_platform.c
>> @@ -27,12 +27,16 @@
>> #include <linux/can/dev.h>
>> #include <linux/can/platform/sja1000.h>
>> #include <linux/io.h>
>> +#include <linux/of.h>
>> +#include <linux/of_irq.h>
>>
>> #include "sja1000.h"
>>
>> #define DRV_NAME "sja1000_platform"
>> +#define SJA1000_OFP_CAN_CLOCK (16000000 / 2)
>
> This driver uses "SP" short for sja100_platform as namespace, please
> convert.
>
>>
>> MODULE_AUTHOR("Sascha Hauer <s.hauer@...gutronix.de>");
>> +MODULE_AUTHOR("Wolfgang Grandegger <wg@...ndegger.com>");
>> MODULE_DESCRIPTION("Socket-CAN driver for SJA1000 on the platform bus");
>> MODULE_ALIAS("platform:" DRV_NAME);
>> MODULE_LICENSE("GPL v2");
>> @@ -67,24 +71,98 @@ static void sp_write_reg32(const struct sja1000_priv *priv, int reg, u8 val)
>> iowrite8(val, priv->reg_base + reg * 4);
>> }
>>
>> -static int sp_probe(struct platform_device *pdev)
>> +static void sp_populate(struct sja1000_priv *priv,
>> + struct sja1000_platform_data *pdata,
>> + unsigned long resource_mem_flags)
>> +{
>> + /* The CAN clock frequency is half the oscillator clock frequency */
>> + priv->can.clock.freq = pdata->osc_freq / 2;
>> + priv->ocr = pdata->ocr;
>> + priv->cdr = pdata->cdr;
>> +
>> + switch (resource_mem_flags & IORESOURCE_MEM_TYPE_MASK) {
>> + case IORESOURCE_MEM_32BIT:
>> + priv->read_reg = sp_read_reg32;
>> + priv->write_reg = sp_write_reg32;
>> + break;
>> + case IORESOURCE_MEM_16BIT:
>> + priv->read_reg = sp_read_reg16;
>> + priv->write_reg = sp_write_reg16;
>> + break;
>> + case IORESOURCE_MEM_8BIT:
>> + default:
>> + priv->read_reg = sp_read_reg8;
>> + priv->write_reg = sp_write_reg8;
>> + break;
>> + }
>> +}
>> +
>> +#if defined(CONFIG_OF)
>
> The driver also compiles on systems without CONFIG_OF without these
> defines. Please remove.
>
>> +static void sp_populate_of(struct sja1000_priv *priv, struct device_node *of)
>> {
>> int err;
>> + u32 prop;
>> +
>> + priv->read_reg = sp_read_reg8;
>> + priv->write_reg = sp_write_reg8;
>> +
>> + err = of_property_read_u32(of, "nxp,external-clock-frequency", &prop);
>> + if (!err)
>> + priv->can.clock.freq = prop / 2;
>> + else
>> + priv->can.clock.freq = SJA1000_OFP_CAN_CLOCK; /* default */
>> +
>> + err = of_property_read_u32(of, "nxp,tx-output-mode", &prop);
>> + if (!err)
>> + priv->ocr |= prop & OCR_MODE_MASK;
>> + else
>> + priv->ocr |= OCR_MODE_NORMAL; /* default */
>> +
>> + err = of_property_read_u32(of, "nxp,tx-output-config", &prop);
>> + if (!err)
>> + priv->ocr |= (prop << OCR_TX_SHIFT) & OCR_TX_MASK;
>> + else
>> + priv->ocr |= OCR_TX0_PULLDOWN; /* default */
>> +
>> + err = of_property_read_u32(of, "nxp,clock-out-frequency", &prop);
>> + if (!err && prop) {
>> + u32 divider = priv->can.clock.freq * 2 / prop;
>> +
>> + if (divider > 1)
>> + priv->cdr |= divider / 2 - 1;
>> + else
>> + priv->cdr |= CDR_CLKOUT_MASK;
>> + } else {
>> + priv->cdr |= CDR_CLK_OFF; /* default */
>> + }
>> +
>> + if (!of_property_read_bool(of, "nxp,no-comparator-bypass"))
>> + priv->cdr |= CDR_CBP; /* default */
>> +}
>> +#else
>> +static void sp_populate_of(struct sja1000_priv *priv, device_node *of)
>> +{
>> +}
>> +#endif
>> +
>> +static int sp_probe(struct platform_device *pdev)
>> +{
>> + int err, irq = 0;
>> void __iomem *addr;
>> struct net_device *dev;
>> struct sja1000_priv *priv;
>> - struct resource *res_mem, *res_irq;
>> + struct resource *res_mem, *res_irq = 0;
>
> Please use NULL to initialize pointers.
>
>> struct sja1000_platform_data *pdata;
>> + struct device_node *of = pdev->dev.of_node;
>>
>> pdata = dev_get_platdata(&pdev->dev);
>> - if (!pdata) {
>> + if (!pdata && !of) {
>> dev_err(&pdev->dev, "No platform data provided!\n");
>> return -ENODEV;
>> }
>>
>> res_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>> - res_irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
>> - if (!res_mem || !res_irq)
>> + if (!res_mem)
>> return -ENODEV;
>>
>> if (!devm_request_mem_region(&pdev->dev, res_mem->start,
>> @@ -96,36 +174,34 @@ static int sp_probe(struct platform_device *pdev)
>> if (!addr)
>> return -ENOMEM;
>>
>> + if (of)
>> + irq = irq_of_parse_and_map(of, 0);
>> + else
>> + res_irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
>> +
>> + if (!irq && !res_irq)
>> + return -ENODEV;
>> +
>> dev = alloc_sja1000dev(0);
>> if (!dev)
>> return -ENOMEM;
>> priv = netdev_priv(dev);
>>
>> - dev->irq = res_irq->start;
>> - priv->irq_flags = res_irq->flags & IRQF_TRIGGER_MASK;
>> - if (res_irq->flags & IORESOURCE_IRQ_SHAREABLE)
>> - priv->irq_flags |= IRQF_SHARED;
>> + if (res_irq) {
>> + irq = res_irq->start;
>> + priv->irq_flags = res_irq->flags & IRQF_TRIGGER_MASK;
>> + if (res_irq->flags & IORESOURCE_IRQ_SHAREABLE)
>> + priv->irq_flags |= IRQF_SHARED;
>> + } else
>> + priv->irq_flags = IRQF_SHARED;
>
> Please add { } for else, too.
>
>> +
>> + dev->irq = irq;
>> priv->reg_base = addr;
>> - /* The CAN clock frequency is half the oscillator clock frequency */
>> - priv->can.clock.freq = pdata->osc_freq / 2;
>> - priv->ocr = pdata->ocr;
>> - priv->cdr = pdata->cdr;
>>
>> - switch (res_mem->flags & IORESOURCE_MEM_TYPE_MASK) {
>> - case IORESOURCE_MEM_32BIT:
>> - priv->read_reg = sp_read_reg32;
>> - priv->write_reg = sp_write_reg32;
>> - break;
>> - case IORESOURCE_MEM_16BIT:
>> - priv->read_reg = sp_read_reg16;
>> - priv->write_reg = sp_write_reg16;
>> - break;
>> - case IORESOURCE_MEM_8BIT:
>> - default:
>> - priv->read_reg = sp_read_reg8;
>> - priv->write_reg = sp_write_reg8;
>> - break;
>> - }
>> + if (of)
>> + sp_populate_of(priv, of);
>> + else
>> + sp_populate(priv, pdata, res_mem->flags);
>>
>> platform_set_drvdata(pdev, dev);
>> SET_NETDEV_DEV(dev, &pdev->dev);
>> @@ -156,12 +232,21 @@ static int sp_remove(struct platform_device *pdev)
>> return 0;
>> }
>>
>> +#if defined(CONFIG_OF)
>
> Please remove the ifdef.
>
>> +static struct of_device_id sja1000_ofp_table[] = {
>
> Please rename into sp_of_table or something similar.
>
>> + {.compatible = "nxp,sja1000"},
>> + {},
>> +};
>> +MODULE_DEVICE_TABLE(of, sja1000_ofp_table);
>> +#endif
>> +
>> static struct platform_driver sp_driver = {
>> .probe = sp_probe,
>> .remove = sp_remove,
>> .driver = {
>> .name = DRV_NAME,
>> .owner = THIS_MODULE,
>> + .of_match_table = of_match_ptr(sja1000_ofp_table),
>
> The of_match_ptr is not needed anymore, please remove.
>
>> },
>> };
>>
>>
>
> Marc
>
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