On Thu, 21 Nov 2024, Manikandan Muralidharan wrote:
> The XLCDC IP supports DSI, parallel RGB and LVDS Display.
> sys_clk(Generic clock) is used for DSI and Parallel RGB displays;
> And LVDS PLL is used with LVDS displays.
> obtain anyone of the clocks for the LCD to operate
Maybe say something about this being a fall-back strategy.
>
> Signed-off-by: Manikandan Muralidharan <manikandan.m@xxxxxxxxxxxxx>
> Signed-off-by: Dharma Balasubiramani <dharma.b@xxxxxxxxxxxxx>
> ---
> drivers/mfd/atmel-hlcdc.c | 16 ++++++++++++++--
> include/linux/mfd/atmel-hlcdc.h | 1 +
> 2 files changed, 15 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/mfd/atmel-hlcdc.c b/drivers/mfd/atmel-hlcdc.c
> index 4c4e35d404f3..60b0b766459e 100644
> --- a/drivers/mfd/atmel-hlcdc.c
> +++ b/drivers/mfd/atmel-hlcdc.c
> @@ -108,10 +108,22 @@ static int atmel_hlcdc_probe(struct platform_device *pdev)
> return PTR_ERR(hlcdc->periph_clk);
> }
>
> + /*
> + * Obtain one of the main clocks (GCK / LVDS PLL) required by the
> + * LCD to function,
> + * GCK for Parallel RGB and MIPI displays;
> + * LVDS PLL for LVDS displays.
> + */
> + hlcdc->sys_clk = NULL;
> + hlcdc->lvds_pll_clk = NULL;
Since, devm_kzalloc() is used to allocate this memory space, these are
already NULL.
> hlcdc->sys_clk = devm_clk_get(dev, "sys_clk");
> if (IS_ERR(hlcdc->sys_clk)) {
> - dev_err(dev, "failed to get system clock\n");
> - return PTR_ERR(hlcdc->sys_clk);
> + dev_dbg(dev, "failed to get system clock\n");
This should be a dev_warn().
May be add some more information.
"failed to get system clock, trying xyz instead"
'\n' here.
> + hlcdc->lvds_pll_clk = devm_clk_get(dev, "lvds_pll_clk");
> + if (IS_ERR(hlcdc->lvds_pll_clk)) {
> + dev_err(dev, "failed to get LVDS PLL clock\n");
> + return PTR_ERR(hlcdc->lvds_pll_clk);
> + }
> }
>
> hlcdc->slow_clk = devm_clk_get(dev, "slow_clk");
> diff --git a/include/linux/mfd/atmel-hlcdc.h b/include/linux/mfd/atmel-hlcdc.h
> index 80d675a03b39..07c2081867fd 100644
> --- a/include/linux/mfd/atmel-hlcdc.h
> +++ b/include/linux/mfd/atmel-hlcdc.h
> @@ -75,6 +75,7 @@
> */
> struct atmel_hlcdc {
> struct regmap *regmap;
> + struct clk *lvds_pll_clk;
> struct clk *periph_clk;
> struct clk *sys_clk;
> struct clk *slow_clk;
> --
> 2.25.1
>
--
Lee Jones [李琼斯]
