On Mon, 2019-07-29 at 15:01 +0800, Bibby Hsieh wrote:
> GCE cannot know the register base address, this function
> can help cmdq client to get the cmdq_client_reg structure.
>
> Signed-off-by: Bibby Hsieh <bibby.hs...@mediatek.com>
> ---
> drivers/soc/mediatek/mtk-cmdq-helper.c | 29 ++++++++++++++++++++++++++
> include/linux/soc/mediatek/mtk-cmdq.h | 21 +++++++++++++++++++
> 2 files changed, 50 insertions(+)
>
> diff --git a/drivers/soc/mediatek/mtk-cmdq-helper.c
> b/drivers/soc/mediatek/mtk-cmdq-helper.c
> index 70ad4d806fac..9695b75cfc89 100644
> --- a/drivers/soc/mediatek/mtk-cmdq-helper.c
> +++ b/drivers/soc/mediatek/mtk-cmdq-helper.c
> @@ -27,6 +27,35 @@ struct cmdq_instruction {
> u8 op;
> };
>
> +int cmdq_dev_get_client_reg(struct device *dev,
> + struct cmdq_client_reg *client_reg, int idx)
> +{
> + struct of_phandle_args spec;
> + int err;
> +
> + if (!client_reg)
> + return -ENOENT;
> +
> + err = of_parse_phandle_with_fixed_args(dev->of_node,
> + "mediatek,gce-client-reg",
> + 3, idx, &spec);
> + if (err < 0) {
> + dev_err(dev,
> + "error %d can't parse gce-client-reg property (%d)",
> + err, idx);
> +
> + return err;
> + }
> +
> + client_reg->subsys = spec.args[0];
> + client_reg->offset = spec.args[1];
> + client_reg->size = spec.args[2];
Maybe we need add type conversion to avoid compiling warnings.
client_reg->subsys = (u8)spec.args[0];
client_reg->offset = (u16)spec.args[1];
client_reg->size = (u16)spec.args[2];
> + of_node_put(spec.np);
> +
> + return 0;
> +}
> +EXPORT_SYMBOL(cmdq_dev_get_client_reg);
> +
> static void cmdq_client_timeout(struct timer_list *t)
> {
> struct cmdq_client *client = from_timer(client, t, timer);
> diff --git a/include/linux/soc/mediatek/mtk-cmdq.h
> b/include/linux/soc/mediatek/mtk-cmdq.h
> index a345870a6d10..be402c4c740e 100644
> --- a/include/linux/soc/mediatek/mtk-cmdq.h
> +++ b/include/linux/soc/mediatek/mtk-cmdq.h
> @@ -15,6 +15,12 @@
>
> struct cmdq_pkt;
>
> +struct cmdq_client_reg {
> + u8 subsys;
> + u16 offset;
> + u16 size;
> +};
> +
> struct cmdq_client {
> spinlock_t lock;
> u32 pkt_cnt;
> @@ -142,4 +148,19 @@ int cmdq_pkt_flush_async(struct cmdq_pkt *pkt,
> cmdq_async_flush_cb cb,
> */
> int cmdq_pkt_flush(struct cmdq_pkt *pkt);
>
> +/**
> + * cmdq_dev_get_client_reg() - parse cmdq client reg from the device
> + * node of CMDQ client
> + * @dev: device of CMDQ mailbox clienti
> + * @client_reg: CMDQ client reg pointer
> + * @idx: the index of desired reg
> + *
> + * Return: 0 for success; else the error code is returned
> + *
> + * Help CMDQ client pasing the cmdq client reg
> + * from the device node of CMDQ client.
> + */
> +int cmdq_dev_get_client_reg(struct device *dev,
> + struct cmdq_client_reg *client_reg, int idx);
> +
Could we keep the same order of function declaration and implementation?
> #endif /* __MTK_CMDQ_H__ */
