Subject: [PATCH v10 2/2] tty/serial: Add Spreadtrum sc9836-uart driver support

From: [email-masked] (Varka Bhadram)
Date: Thu, 29 Jan 2015 21:02:41 +0530

On Thursday 29 January 2015 08:56 PM, Varka Bhadram wrote:
> Hi,
>
> On Wednesday 28 January 2015 04:38 PM, Chunyan Zhang wrote:
>> Add a full sc9836-uart driver for SC9836 SoC which is based on the
>> spreadtrum sharkl64 platform.
>> This driver also support earlycon.
>>
>> Originally-by: Lanqing Liu <[email-masked]>
>> Signed-off-by: Orson Zhai <[email-masked]>
>> Signed-off-by: Chunyan Zhang <[email-masked]>
>> Acked-by: Arnd Bergmann <[email-masked]>
>> Reviewed-by: Peter Hurley <[email-masked]>
>> ---
>>   drivers/tty/serial/Kconfig       |   18 +
>>   drivers/tty/serial/Makefile      |    1 +
>>   drivers/tty/serial/sprd_serial.c |  793 
>> ++++++++++++++++++++++++++++++++++++++
>>   include/uapi/linux/serial_core.h |    3 +
>>   4 files changed, 815 insertions(+)
>>   create mode 100644 drivers/tty/serial/sprd_serial.c
>>
> (...)
>
>> +static int sprd_probe(struct platform_device *pdev)
>> +{
>> +    struct resource *res;
>> +    struct uart_port *up;
>> +    struct clk *clk;
>> +    int irq;
>> +    int index;
>> +    int ret;
>> +
>> +    for (index = 0; index < ARRAY_SIZE(sprd_port); index++)
>> +        if (sprd_port[index] == NULL)
>> +            break;
>> +
>> +    if (index == ARRAY_SIZE(sprd_port))
>> +        return -EBUSY;
>> +
>> +    index = sprd_probe_dt_alias(index, &pdev->dev);
>> +
>> +    sprd_port[index] = devm_kzalloc(&pdev->dev,
>> +        sizeof(*sprd_port[index]), GFP_KERNEL);
>> +    if (!sprd_port[index])
>> +        return -ENOMEM;
>> +
>> +    up = &sprd_port[index]->port;
>> +    up->dev = &pdev->dev;
>> +    up->line = index;
>> +    up->type = PORT_SPRD;
>> +    up->iotype = SERIAL_IO_PORT;
>> +    up->uartclk = SPRD_DEF_RATE;
>> +    up->fifosize = SPRD_FIFO_SIZE;
>> +    up->ops = &serial_sprd_ops;
>> +    up->flags = UPF_BOOT_AUTOCONF;
>> +
>> +    clk = devm_clk_get(&pdev->dev, NULL);
>> +    if (!IS_ERR(clk))
>> +        up->uartclk = clk_get_rate(clk);
>> +
>> +    res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>> +    if (!res) {
>> +        dev_err(&pdev->dev, "not provide mem resource\n");
>> +        return -ENODEV;
>> +    }
>
> This check is not required. It will be done by devm_ioremap_resource()
>
>> +    up->mapbase = res->start;

Accessing of 'res' has to be done after devm_ioremap_resource()

>> +    up->membase = devm_ioremap_resource(&pdev->dev, res);
>> +    if (IS_ERR(up->membase))
>> +        return PTR_ERR(up->membase);
>> +
>>
>

-- 
Thanks,
Varka Bhadram.