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Date: Tue, 27 Jan 2015 23:51:55 +0800
From: Lyra Zhang <zhang.lyra@...il.com>
To: Peter Hurley <peter@...leysoftware.com>,
"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>
Cc: Chunyan Zhang <chunyan.zhang@...eadtrum.com>,
"robh+dt@...nel.org" <robh+dt@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Arnd Bergmann <arnd@...db.de>,
"gnomes@...rguk.ukuu.org.uk" <gnomes@...rguk.ukuu.org.uk>,
Pawel Moll <pawel.moll@....com>,
"ijc+devicetree@...lion.org.uk" <ijc+devicetree@...lion.org.uk>,
Kumar Gala <galak@...eaurora.org>,
Grant Likely <grant.likely@...aro.org>,
"jslaby@...e.cz" <jslaby@...e.cz>,
Heiko Stübner <heiko@...ech.de>,
"jason@...edaemon.net" <jason@...edaemon.net>,
"florian.vaussard@...l.ch" <florian.vaussard@...l.ch>,
"andrew@...n.ch" <andrew@...n.ch>,
Hayato Suzuki <hytszk@...il.com>,
"antonynpavlov@...il.com" <antonynpavlov@...il.com>,
Shawn Guo <shawn.guo@...aro.org>,
Orson Zhai <orsonzhai@...il.com>,
"geng.ren@...eadtrum.com" <geng.ren@...eadtrum.com>,
"zhizhou.zhang" <zhizhou.zhang@...eadtrum.com>,
"lanqing.liu@...eadtrum.com" <lanqing.liu@...eadtrum.com>,
Wei Qiao (乔伟) <wei.qiao@...eadtrum.com>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>,
"linux-api@...r.kernel.org" <linux-api@...r.kernel.org>,
"linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v8 2/2] tty/serial: Add Spreadtrum sc9836-uart driver support
On Tue, Jan 27, 2015 at 10:47 PM, Peter Hurley <peter@...leysoftware.com> wrote:
> Hi Chunyan,
>
> Minor but important fixes below.
>
> And for the v9 version, please only use "To:" for
> "Greg Kroah-Hartman <gregkh@...uxfoundation.org>"
>
Ok, thank you, I'll address your comments below and send the v9 to Greg.
Greg,
sorry, I'll send you a updated version tomorrow.
> All other recipients should only be Cc:
>
> Regards,
> Peter Hurley
>
>
> On 01/27/2015 02:56 AM, 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.
>
> [...]
>
>> +static int sprd_probe_dt_alias(int index, struct device *dev)
>> +{
>> + struct device_node *np;
>> + static bool seen_dev_with_alias;
>> + static bool seen_dev_without_alias;
> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>
> delete these two lines; these were used for the message deleted in a
> previous patch version.
>
>> + int ret = index;
>> +
>> + if (!IS_ENABLED(CONFIG_OF))
>> + return ret;
>> +
>> + np = dev->of_node;
>> + if (!np)
>> + return ret;
>> +
>> + ret = of_alias_get_id(np, "serial");
>> + if (IS_ERR_VALUE(ret)) {
>> + seen_dev_without_alias = true;
> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> delete this line.
>
>> + ret = index;
>> + } else {
>> + seen_dev_with_alias = true;
> ^^^^^^^^^^^^^^^^^^^^^^^^^^^
> delete this line.
>
>> + if (ret >= ARRAY_SIZE(sprd_port) || sprd_port[ret] != NULL) {
>> + dev_warn(dev, "requested serial port %d not available.\n", ret);
>> + ret = index;
>> + }
>> + }
>
> Simplify the entire "if (IS_ERR_VALUE(ret))" statement to:
>
> if (IS_ERR_VALUE(ret))
> ret = index;
> else if (ret >= ..................) {
> dev_warn(.....);
> ret = index;
> }
>
>
>> +
>> + return ret;
>> +}
>> +
>> +static int sprd_remove(struct platform_device *dev)
>> +{
>> + struct sprd_uart_port *sup = platform_get_drvdata(dev);
>> +
>> + if (sup) {
>> + uart_remove_one_port(&sprd_uart_driver, &sup->port);
>> + sprd_port[sup->port.line] = NULL;
>> + sprd_ports_num--;
>> + }
>> +
>> + if (!sprd_ports_num)
>> + uart_unregister_driver(&sprd_uart_driver);
>> +
>> + return 0;
>> +}
>> +
>> +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;
>> +
>> + pdev->id = index;
> ^^^^^^^^^^^^^^^^
> delete this line.
>
> The platform device id cannot be assigned by the driver.
> (This was left over from trying to fix sprd_suspend/sprd_resume
> but that's fixed correctly now.)
>
>> +
>> + 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;
>> + }
>> + up->mapbase = res->start;
>> + up->membase = devm_ioremap_resource(&pdev->dev, res);
>> + if (IS_ERR(up->membase))
>> + return PTR_ERR(up->membase);
>> +
>> + irq = platform_get_irq(pdev, 0);
>> + if (irq < 0) {
>> + dev_err(&pdev->dev, "not provide irq resource\n");
>> + return -ENODEV;
>> + }
>> + up->irq = irq;
>> +
>> + if (!sprd_ports_num) {
>> + ret = uart_register_driver(&sprd_uart_driver);
>> + if (ret < 0) {
>> + pr_err("Failed to register SPRD-UART driver\n");
>> + return ret;
>> + }
>> + }
>> + sprd_ports_num++;
>> +
>> + ret = uart_add_one_port(&sprd_uart_driver, up);
>> + if (ret) {
>> + sprd_port[index] = NULL;
>> + sprd_remove(pdev);
>> + }
>> +
>> + platform_set_drvdata(pdev, up);
>> +
>> + return ret;
>> +}
>
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