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SubjectRe: [PATCH v3] sm501: Add device property
On Mon, Jul 04, 2016 at 11:26:04PM +0900, Yoshinori Sato wrote:
> Add device proptery on enable integrated peripheral.
> It have platform_data. But don't have devicetree.
>
> Signed-off-by: Yoshinori Sato <ysato@users.sourceforge.jp>
> ---
> .../devicetree/bindings/display/sm501fb.txt | 11 +++++++++
> drivers/mfd/sm501.c | 28 +++++++++++++---------
> 2 files changed, 28 insertions(+), 11 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/display/sm501fb.txt b/Documentation/devicetree/bindings/display/sm501fb.txt
> index 9d9f009..9290094 100644
> --- a/Documentation/devicetree/bindings/display/sm501fb.txt
> +++ b/Documentation/devicetree/bindings/display/sm501fb.txt
> @@ -22,6 +22,17 @@ Optional properties:
> set different foreign endian.
> - big-endian: available on little endian systems, to
> set different foreign endian.
> +- smi,devices: function block enable bitmap.
> + bit0: USB host
> + bit1: USB slave
> + bit2: SSP Ch0
> + bit3: SSP Ch1
> + bit4: UART Ch0
> + bit5: UART Ch1
> + bit6: Accelerator
> + bit7: AC97
> + bit8: I2S
> + bit9: GPIO

Generally we don't place bitmaps like this in DT.

What exactly does this property represent? Whether certain sub-blocks
are present?

These should probably be separate has-${FOO} proeprties. It may be
better to have separate nodes, if we'e going to need to refer to sub
blocks by phandle, or are liekly to have peropties specific to a sub
block.

Thanks,
Mark.

> Example for MPC5200:
> display@1,0 {
> diff --git a/drivers/mfd/sm501.c b/drivers/mfd/sm501.c
> index 65cd0d2..e8c6a5e 100644
> --- a/drivers/mfd/sm501.c
> +++ b/drivers/mfd/sm501.c
> @@ -21,6 +21,7 @@
> #include <linux/pci.h>
> #include <linux/i2c-gpio.h>
> #include <linux/slab.h>
> +#include <linux/of.h>
>
> #include <linux/sm501.h>
> #include <linux/sm501-regs.h>
> @@ -1297,7 +1298,7 @@ static unsigned int sm501_mem_local[] = {
> * Common init code for an SM501
> */
>
> -static int sm501_init_dev(struct sm501_devdata *sm)
> +static int sm501_init_dev(struct sm501_devdata *sm, unsigned int devices)
> {
> struct sm501_initdata *idata;
> struct sm501_platdata *pdata;
> @@ -1342,16 +1343,15 @@ static int sm501_init_dev(struct sm501_devdata *sm)
> pdata = sm->platdata;
> idata = pdata ? pdata->init : NULL;
>
> - if (idata) {
> + if (idata)
> sm501_init_regs(sm, idata);
>
> - if (idata->devices & SM501_USE_USB_HOST)
> - sm501_register_usbhost(sm, &mem_avail);
> - if (idata->devices & (SM501_USE_UART0 | SM501_USE_UART1))
> - sm501_register_uart(sm, idata->devices);
> - if (idata->devices & SM501_USE_GPIO)
> - sm501_register_gpio(sm);
> - }
> + if (devices & SM501_USE_USB_HOST)
> + sm501_register_usbhost(sm, &mem_avail);
> + if (devices & (SM501_USE_UART0 | SM501_USE_UART1))
> + sm501_register_uart(sm, devices);
> + if (devices & SM501_USE_GPIO)
> + sm501_register_gpio(sm);
>
> if (pdata && pdata->gpio_i2c != NULL && pdata->gpio_i2c_nr > 0) {
> if (!sm501_gpio_isregistered(sm))
> @@ -1377,6 +1377,7 @@ static int sm501_plat_probe(struct platform_device *dev)
> {
> struct sm501_devdata *sm;
> int ret;
> + unsigned int devices = 0;
>
> sm = kzalloc(sizeof(struct sm501_devdata), GFP_KERNEL);
> if (sm == NULL) {
> @@ -1415,6 +1416,11 @@ static int sm501_plat_probe(struct platform_device *dev)
> }
>
> platform_set_drvdata(dev, sm);
> + if (sm->platdata)
> + devices = sm->platdata->init->devices;
> + if (dev->dev.of_node)
> + of_property_read_u32(dev->dev.of_node, "smi,devices",
> + &devices);
>
> sm->regs = ioremap(sm->io_res->start, resource_size(sm->io_res));
>
> @@ -1424,7 +1430,7 @@ static int sm501_plat_probe(struct platform_device *dev)
> goto err_claim;
> }
>
> - return sm501_init_dev(sm);
> + return sm501_init_dev(sm, devices);
>
> err_claim:
> release_resource(sm->regs_claim);
> @@ -1635,7 +1641,7 @@ static int sm501_pci_probe(struct pci_dev *dev,
> goto err4;
> }
>
> - sm501_init_dev(sm);
> + sm501_init_dev(sm, sm->platdata->init->devices);
> return 0;
>
> err4:
> --
> 2.7.0
>
> --
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