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staging: most: dim2: read clock speed from the device

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This patch implemets reading of the clock speed from DT.

Signed-off-by: Christian Gromm <christian.gromm@microchip.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Christian Gromm 2018-05-08 11:45:12 +02:00 committed by Greg Kroah-Hartman
parent 21e57ff086
commit 1fb6089acb
1 changed files with 49 additions and 1 deletions
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50
drivers/staging/most/dim2/dim2.c
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@ -693,6 +693,42 @@ static void dma_free(struct mbo *mbo, u32 size)
static const struct of_device_id dim2_of_match[];
static struct {
const char *clock_speed;
u8 clk_speed;
} clk_mt[] = {
{ "256fs", CLK_256FS },
{ "512fs", CLK_512FS },
{ "1024fs", CLK_1024FS },
{ "2048fs", CLK_2048FS },
{ "3072fs", CLK_3072FS },
{ "4096fs", CLK_4096FS },
{ "6144fs", CLK_6144FS },
{ "8192fs", CLK_8192FS },
};
/**
* get_dim2_clk_speed - converts string to DIM2 clock speed value
*
* @clock_speed: string in the format "{NUMBER}fs"
* @val: pointer to get one of the CLK_{NUMBER}FS values
*
* By success stores one of the CLK_{NUMBER}FS in the *val and returns 0,
* otherwise returns -EINVAL.
*/
static int get_dim2_clk_speed(const char *clock_speed, u8 *val)
{
int i;
for (i = 0; i < ARRAY_SIZE(clk_mt); i++) {
if (!strcmp(clock_speed, clk_mt[i].clock_speed)) {
*val = clk_mt[i].clk_speed;
return 0;
}
}
return -EINVAL;
}
/*
* dim2_probe - dim2 probe handler
* @pdev: platform device structure
@ -704,6 +740,7 @@ static int dim2_probe(struct platform_device *pdev)
{
const struct dim2_platform_data *pdata;
const struct of_device_id *of_id;
const char *clock_speed;
struct dim2_hdm *dev;
struct resource *res;
int ret, i;
@ -720,7 +757,18 @@ static int dim2_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, dev);
dev->clk_speed = CLK_4096FS;
ret = of_property_read_string(pdev->dev.of_node,
"microchip,clock-speed", &clock_speed);
if (ret) {
dev_err(&pdev->dev, "missing dt property clock-speed\n");
return ret;
}
ret = get_dim2_clk_speed(clock_speed, &dev->clk_speed);
if (ret) {
dev_err(&pdev->dev, "bad dt property clock-speed\n");
return ret;
}
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
dev->io_base = devm_ioremap_resource(&pdev->dev, res);