From: "Hyunki Koo" <hyunki00.koo@samsung.com>
To: "'Krzysztof Kozlowski'" <krzk@kernel.org>
Cc: <gregkh@linuxfoundation.org>, "'Kukjin Kim'" <kgene@kernel.org>,
"'Jiri Slaby'" <jslaby@suse.com>,
<linux-arm-kernel@lists.infradead.org>,
<linux-samsung-soc@vger.kernel.org>,
<linux-serial@vger.kernel.org>, <linux-kernel@vger.kernel.org>
Subject: RE: [PATCH v4] tty: samsung_tty: 32-bit access for TX/RX hold registers
Date: Mon, 6 Apr 2020 06:41:09 +0900 [thread overview]
Message-ID: <000101d60b92$eb97c050$c2c740f0$@samsung.com> (raw)
In-Reply-To: <20200403133457.GA7561@kozik-lap>
On Fri, Apr 03, 2020 at 10:35:10PM +0900, Krzysztof Kozlowski wrote:
> On Fri, Apr 03, 2020 at 08:15:10PM +0900, Hyunki Koo wrote:
> > Support 32-bit access for the TX/RX hold registers UTXH and URXH.
> >
> > This is required for some newer SoCs.
> >
> > Signed-off-by: Hyunki Koo <hyunki00.koo@samsung.com>
> > ---
> > v2:
> > line 954 : change rd_regl to rd_reg in for backward compatibility.
> > line 2031: Add init value for ourport->port.iotype to UPIO_MEM
> > v3:
> > line 2031: remove redundant init value for ourport->port.iotype
> > v4:
> > correct variable types and change misleading function name
> > ---
> > drivers/tty/serial/samsung_tty.c | 76
> > +++++++++++++++++++++++++++++++++-------
> > 1 file changed, 64 insertions(+), 12 deletions(-)
> >
> > diff --git a/drivers/tty/serial/samsung_tty.c
> > b/drivers/tty/serial/samsung_tty.c
> > index 73f951d65b93..bdf1d4d12cb1 100644
> > --- a/drivers/tty/serial/samsung_tty.c
> > +++ b/drivers/tty/serial/samsung_tty.c
> > @@ -154,12 +154,47 @@ struct s3c24xx_uart_port { #define
> > portaddrl(port, reg) \
> > ((unsigned long *)(unsigned long)((port)->membase + (reg)))
> >
> > -#define rd_regb(port, reg) (readb_relaxed(portaddr(port, reg)))
> > +static u32 rd_reg(struct uart_port *port, u32 reg) {
> > + switch (port->iotype) {
> > + case UPIO_MEM:
> > + return readb_relaxed(portaddr(port, reg));
> > + case UPIO_MEM32:
> > + return readl_relaxed(portaddr(port, reg));
> > + default:
> > + return 0;
> > + }
> > + return 0;
> > +}
> > +
> > #define rd_regl(port, reg) (readl_relaxed(portaddr(port, reg)))
> >
> > -#define wr_regb(port, reg, val) writeb_relaxed(val, portaddr(port,
> > reg))
> > +static void wr_reg(struct uart_port *port, u32 reg, u32 val) {
> > + switch (port->iotype) {
> > + case UPIO_MEM:
> > + writeb_relaxed(val, portaddr(port, reg));
> > + break;
> > + case UPIO_MEM32:
> > + writel_relaxed(val, portaddr(port, reg));
> > + break;
> > + }
> > +}
> > +
> > #define wr_regl(port, reg, val) writel_relaxed(val, portaddr(port,
> > reg))
> >
> > +static void wr_reg_barrier(struct uart_port *port, u32 reg, u32 val)
> > +{
> > + switch (port->iotype) {
> > + case UPIO_MEM:
> > + writeb(val, portaddr(port, reg));
> > + break;
> > + case UPIO_MEM32:
> > + writel(val, portaddr(port, reg));
> > + break;
> > + }
> > +}
> > +
> > /* Byte-order aware bit setting/clearing functions. */
> >
> > static inline void s3c24xx_set_bit(struct uart_port *port, int idx,
> > @@ -714,7 +749,7 @@ static void s3c24xx_serial_rx_drain_fifo(struct
> s3c24xx_uart_port *ourport)
> > fifocnt--;
> >
> > uerstat = rd_regl(port, S3C2410_UERSTAT);
> > - ch = rd_regb(port, S3C2410_URXH);
> > + ch = rd_reg(port, S3C2410_URXH);
> >
> > if (port->flags & UPF_CONS_FLOW) {
> > int txe = s3c24xx_serial_txempty_nofifo(port);
> > @@ -826,7 +861,7 @@ static irqreturn_t s3c24xx_serial_tx_chars(int
> irq, void *id)
> > }
> >
> > if (port->x_char) {
> > - wr_regb(port, S3C2410_UTXH, port->x_char);
> > + wr_reg(port, S3C2410_UTXH, port->x_char);
> > port->icount.tx++;
> > port->x_char = 0;
> > goto out;
> > @@ -852,7 +887,7 @@ static irqreturn_t s3c24xx_serial_tx_chars(int
> irq, void *id)
> > if (rd_regl(port, S3C2410_UFSTAT) & ourport->info-
> >tx_fifofull)
> > break;
> >
> > - wr_regb(port, S3C2410_UTXH, xmit->buf[xmit->tail]);
> > + wr_reg(port, S3C2410_UTXH, xmit->buf[xmit->tail]);
> > xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
> > port->icount.tx++;
> > count--;
> > @@ -916,7 +951,7 @@ static unsigned int
> s3c24xx_serial_tx_empty(struct
> > uart_port *port)
> > /* no modem control lines */
> > static unsigned int s3c24xx_serial_get_mctrl(struct uart_port *port)
> > {
> > - unsigned int umstat = rd_regb(port, S3C2410_UMSTAT);
> > + unsigned int umstat = rd_reg(port, S3C2410_UMSTAT);
> >
> > if (umstat & S3C2410_UMSTAT_CTS)
> > return TIOCM_CAR | TIOCM_DSR | TIOCM_CTS; @@ -
> 1974,7 +2009,7 @@
> > static int s3c24xx_serial_probe(struct platform_device *pdev)
> > struct device_node *np = pdev->dev.of_node;
> > struct s3c24xx_uart_port *ourport;
> > int index = probe_index;
> > - int ret;
> > + int ret, prop = 0;
> >
> > if (np) {
> > ret = of_alias_get_id(np, "serial"); @@ -2000,10
> +2035,27 @@ static
> > int s3c24xx_serial_probe(struct platform_device *pdev)
> > dev_get_platdata(&pdev->dev) :
> > ourport->drv_data->def_cfg;
> >
> > - if (np)
> > + if (np) {
> > of_property_read_u32(np,
> > "samsung,uart-fifosize", &ourport->port.fifosize);
> >
> > + if (of_property_read_u32(np, "reg-io-width", &prop) ==
> 0) {
>
> I got more thoughts... where is the binding for it? It looked like standard
> DT property but it is not described in device tree spec.
>
> Also, where is the user (DTS) with it? I expect such changes go with the
> user itself... otherwise, next cleanup it will go away.
>
> Best regards,
> Krzysztof
Do you think this kind of change is needed?
Do I have to make as a series patches with previous patch?
diff --git a/Documentation/devicetree/bindings/serial/samsung_uart.yaml b/Documentation/devicetree/bindings/serial/samsung_uart.yaml
index 9d2ce347875b..a57b1233c691 100644
--- a/Documentation/devicetree/bindings/serial/samsung_uart.yaml
+++ b/Documentation/devicetree/bindings/serial/samsung_uart.yaml
@@ -29,6 +29,14 @@ properties:
reg:
maxItems: 1
+ reg-io-width:
+ description: |
+ The size (in bytes) of the IO accesses that should be performed
+ on the device.
+ allOf:
+ - $ref: /schemas/types.yaml#/definitions/uint32
+ - enum: [ 1, 4 ]
+
next prev parent reply other threads:[~2020-04-05 21:41 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CGME20200401082749epcas2p2a774da515805bc3f761b6b5a8dc9e3d2@epcas2p2.samsung.com>
2020-04-01 8:27 ` [PATCH] tty: samsung_tty: 32-bit access for TX/RX hold registers Hyunki Koo
2020-04-01 8:55 ` Greg Kroah-Hartman
2020-04-01 9:19 ` Krzysztof Kozlowski
2020-04-02 9:44 ` Hyunki Koo
2020-04-02 9:48 ` 'Krzysztof Kozlowski'
[not found] ` <CGME20200402110609epcas2p4a5ec1fb3a5eaa3b12c20cfc2060162f3@epcas2p4.samsung.com>
2020-04-02 11:04 ` [PATCH v2] " Hyunki Koo
2020-04-02 12:18 ` Greg KH
2020-04-02 13:59 ` Krzysztof Kozlowski
2020-04-03 7:30 ` Hyunki Koo
2020-04-03 7:51 ` 'Krzysztof Kozlowski'
2020-04-03 10:19 ` Hyunki Koo
[not found] ` <CGME20200403102049epcas2p1d1fe95160b7f37609a8b1710c196cdd8@epcas2p1.samsung.com>
2020-04-03 10:20 ` [PATCH v3] " Hyunki Koo
2020-04-03 10:47 ` Krzysztof Kozlowski
2020-04-03 11:12 ` Hyunki Koo
2020-04-03 11:39 ` 'Krzysztof Kozlowski'
[not found] ` <CGME20200403111520epcas2p42ef81138693ffaaa281499c7a24e0e48@epcas2p4.samsung.com>
2020-04-03 11:15 ` [PATCH v4] " Hyunki Koo
2020-04-03 11:42 ` Greg KH
2020-04-03 11:53 ` Krzysztof Kozlowski
2020-04-03 11:57 ` Greg KH
2020-04-03 12:08 ` Krzysztof Kozlowski
2020-04-03 11:59 ` Krzysztof Kozlowski
2020-04-05 21:35 ` Hyunki Koo
2020-04-06 9:54 ` 'Krzysztof Kozlowski'
2020-04-03 13:34 ` Krzysztof Kozlowski
2020-04-05 21:41 ` Hyunki Koo [this message]
2020-04-06 9:53 ` 'Krzysztof Kozlowski'
[not found] ` <CGME20200406103158epcas2p2aaf3ef769a232dc28c04cb4ae91373bd@epcas2p2.samsung.com>
2020-04-06 10:31 ` [PATCH v5 2/2] " Hyunki Koo
[not found] ` <CGME20200406103206epcas2p2bf3c65f96d94cc91fcdcd3e6db75e2a3@epcas2p2.samsung.com>
2020-04-06 10:31 ` [PATCH v5 1/2] dt-bindings: serial: Add reg-io-width compatible Hyunki Koo
2020-04-06 10:47 ` Krzysztof Kozlowski
2020-04-06 10:34 ` [PATCH v5 2/2] tty: samsung_tty: 32-bit access for TX/RX hold registers Krzysztof Kozlowski
[not found] ` <CGME20200406230902epcas2p19a8df6805dac59968d664efb9bc9419b@epcas2p1.samsung.com>
2020-04-06 23:08 ` [PATCH v6 " Hyunki Koo
[not found] ` <CGME20200406230906epcas2p3f5703f7f9f00cd1cf7dbe5cfd304481f@epcas2p3.samsung.com>
2020-04-06 23:08 ` [PATCH v6 1/2] dt-bindings: serial: Add reg-io-width compatible Hyunki Koo
2020-04-07 6:25 ` Krzysztof Kozlowski
2020-04-09 23:05 ` Rob Herring
2020-04-09 23:09 ` Rob Herring
2020-04-07 4:49 ` [PATCH v6 2/2] tty: samsung_tty: 32-bit access for TX/RX hold registers Jiri Slaby
2020-04-07 6:02 ` Hyunki Koo
2020-04-07 6:24 ` Krzysztof Kozlowski
2020-04-07 6:32 ` Jiri Slaby
2020-04-07 7:22 ` Krzysztof Kozlowski
2020-04-07 6:26 ` Krzysztof Kozlowski
2020-04-07 6:28 ` Jiri Slaby
2020-04-07 6:37 ` Jiri Slaby
2020-04-07 6:54 ` Hyunki Koo
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