On Di, 2025-01-28 at 09:17 +0100, patrice.chotard@xxxxxxxxxxx wrote:
> From: Patrice Chotard <patrice.chotard@xxxxxxxxxxx>
>
> Octo Memory Manager driver (OMM) manages:
> - the muxing between 2 OSPI busses and 2 output ports.
> There are 4 possible muxing configurations:
> - direct mode (no multiplexing): OSPI1 output is on port 1 and OSPI2
> output is on port 2
> - OSPI1 and OSPI2 are multiplexed over the same output port 1
> - swapped mode (no multiplexing), OSPI1 output is on port 2,
> OSPI2 output is on port 1
> - OSPI1 and OSPI2 are multiplexed over the same output port 2
> - the split of the memory area shared between the 2 OSPI instances.
> - chip select selection override.
> - the time between 2 transactions in multiplexed mode.
> - check firewall access.
>
> Signed-off-by: Patrice Chotard <patrice.chotard@xxxxxxxxxxx>
> Signed-off-by: Christophe Kerello <christophe.kerello@xxxxxxxxxxx>
> ---
> drivers/memory/Kconfig | 17 ++
> drivers/memory/Makefile | 1 +
> drivers/memory/stm32_omm.c | 509 +++++++++++++++++++++++++++++++++++++
> 3 files changed, 527 insertions(+)
> create mode 100644 drivers/memory/stm32_omm.c
>
[...]
> diff --git a/drivers/memory/stm32_omm.c b/drivers/memory/stm32_omm.c
> new file mode 100644
> index 000000000000..6f20fe0183ec
> --- /dev/null
> +++ b/drivers/memory/stm32_omm.c
> @@ -0,0 +1,509 @@
[...]
> +static int stm32_omm_configure(struct device *dev)
> +{
> + struct stm32_omm *omm = dev_get_drvdata(dev);
> + struct reset_control *rstc;
> + unsigned long clk_rate, clk_rate_max = 0;
> + int ret;
> + u8 i;
> + u32 mux = 0;
> + u32 cssel_ovr = 0;
> + u32 req2ack = 0;
> +
> + omm->clk = devm_clk_get(dev, NULL);
> + if (IS_ERR(omm->clk)) {
> + dev_err(dev, "Failed to get OMM clock (%ld)\n",
> + PTR_ERR(omm->clk));
> +
> + return PTR_ERR(omm->clk);
> + }
> +
> + ret = pm_runtime_resume_and_get(dev);
> + if (ret < 0)
> + return ret;
> +
> + /* parse children's clock */
> + for (i = 0; i < omm->nb_child; i++) {
> + clk_rate = clk_get_rate(omm->child[i].clk);
> + if (!clk_rate) {
> + dev_err(dev, "Invalid clock rate\n");
> + goto err_clk_disable;
> + }
> +
> + if (clk_rate > clk_rate_max)
> + clk_rate_max = clk_rate;
> + }
> +
> + rstc = devm_reset_control_get_optional(dev, NULL);
Please use devm_reset_control_get_optional_exclusive() directly.
regards
Philipp
